VIDEO SENTRY CORP
DEFM14A, 1997-01-21
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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    As filed with the Securities and Exchange Commission on January 21, 1997
================================================================================

                            SCHEDULE 14A INFORMATION
Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934
                             Filed by Registrant |X|

                 Filed by a Party other than the Registrant |_|

                           Check the appropriate box:

                         | | Preliminary Proxy Statement

                | | Confidential, for Use of the Commission Only
                       (as permitted by Rule 14a-6(e)(2))

                         |X| Definitive Proxy Statement
    
                       |_| Definitive Additional Materials

      |_| Soliciting Material Pursuant to ss.240.14a-11(c) or ss.240.14a-12


                            VIDEO SENTRY CORPORATION
                            KNOGO NORTH AMERICA INC.
              (Name of Registrants as Specified In their Charters)

     (Name of Persons Filing Proxy Statement, if other than the Registrant)


Payment of Filing Fee (Check appropriate box):

|_|  $125 per Exchange Act Rules  0-11(c)(1)(ii),  14a-6(i)(1),  or 14a(i)(2) or
     Item 22(c)(2) of Schedule 14A.
|_|  $500 per each  party  to the  controversy  pursuant  to  Exchange  Act Rule
     14a-6(i)(3).
|_|  Fee computed on table below per Exchange Act Rules 14a-6(i)(4) and 0-11.

     (1)  Title of each class of securities to which transaction applies: 
          Common  Stock,  par value $0.01 per share of Video Sentry  Corporation
          ("Video");  and Common Stock, par value $0.01 per share of Knogo North
          America Inc. ("Knogo").
     (2)  Aggregate number of securities to which transaction applies: 
          4,841,962  shares of Common Stock of Video;  and  5,772,632  shares of
          Common Stock of Knogo.
     (3)  Per unit  price  or other  underlying  value of  transaction  computed
          pursuant to Exchange Act Rule 0-11:  
          $2.40,  representing  the average  high and low prices of Video Common
          Stock on November 26, 1996; and $5.40,  representing  the average high
          and low  prices of Knogo  Common  Stock on  November  26,  1996 on the
          Consolidated Reporting System.
     (4)  Proposed maximum aggregate value of transaction: 
          $45,217,427.00
     (5)  Total fee paid:
          $9,043.49,  equalling  one  fiftieth  of one  percent of the  proposed
          maximum aggregate value of transaction
          _____________________________________________________________________

|X|  Fee paid previously with preliminary materials
|_|  Check box if any part of the fee is offset as provided by Exchange Act Rule
     0-11(a)(2)  and identify the filing for which the  offsetting  fee was paid
     previously.  Identify the previous filing by registration statement number,
     or the Form or Schedule and the date of its filing:

     (1)    Amount Previously Paid:
     (2)    Form, Schedule or Registration Statement No.:
     (3)    Filing Party:
     (4)    Date Filed:

================================================================================


<PAGE>


                          VIDEO SENTRY CORPORATION LOGO

Dear Video Sentry Owner:

   

         You are cordially  invited to attend a Special  Meeting of Shareholders
(the  "Video  Meeting")  of Video  Sentry  Corporation  ("Video")  to be held on
February 6, 1997,  at 10:00 a.m. at the  offices of Winthrop &  Weinstine,  3000
Dain Bosworth Plaza, 60 South Sixth Street, Minneapolis, Minnesota.

         At the Video Meeting,  you will be asked to approve the merger of Video
and Knogo North  America  Inc.  ("Knogo")  pursuant  to an Amended and  Restated
Agreement and Plan of Reorganization  and Merger, dated as of November 27, 1996,
as amended by  Amendment  No. 1 to Amended and  Restated  Agreement  and Plan of
Reorganization  and  Merger,  dated as of January 10,  1997  (collectively,  the
"Merger Agreement").
    

         Upon completion of this merger:

         o Video  and  Knogo  will  become  wholly-owned  subsidiaries  of a new
         holding company named Sentry Technology Corporation ("Sentry");

         o each  outstanding  share of Video Common Stock will be converted into
         the right to receive one share of Sentry Common Stock; and

         o each  1.2022  outstanding  shares  of  Knogo  Common  Stock  will  be
         converted  into the right to receive one share of Sentry  Common  Stock
         plus one share of Sentry Class A Preferred Stock.

         A detailed  description of the Merger Agreement and the proposed merger
are set forth in the accompanying  Joint Proxy  Statement/Prospectus,  which you
should read carefully.

         After careful  consideration,  your Board of Directors  has  determined
that the  transactions  contemplated  by the  Merger  Agreement  are in the best
interests of the shareholders of Video. Accordingly,  the Board has approved the
Merger  Agreement  and  recommends  that  all  Video  shareholders  vote for its
approval.  I firmly  believe,  as does  your  entire  Board of  Directors,  that
combining the  complementary  business,  management  and financial  resources of
Video and Knogo will create a company that is even better positioned to meet the
increased   challenges  of  the  security,   surveillance  and  theft  detection
industries.

         Your vote is  important.  Failure to vote or to return  your proxy card
will have the same effect as a vote  against the merger.  Therefore,  whether or
not you plan to attend the Video Meeting in person and  regardless of the number
of shares you own, I urge you to complete, sign and date the enclosed proxy card
and return it in the enclosed prepaid envelope as soon as possible.  You may, of
course, attend the Video Meeting and vote in person, even if you have previously
returned your proxy card.

                                                  Sincerely yours,

                                                  Robert D. Furst, Jr.
                                                  Chairman and
                                                  Chief Executive Officer

   
January 23, 1997
    


                             YOUR VOTE IS IMPORTANT
                     PLEASE SIGN, DATE AND RETURN YOUR PROXY

<PAGE>



                            VIDEO SENTRY CORPORATION
                               6365 Carlson Drive
                          Eden Prairie, Minnesota 55346



   
                    NOTICE OF SPECIAL MEETING OF SHAREHOLDERS
                                February 6, 1997

                                ----------------

         A Special  Meeting  of  Shareholders  of Video  Sentry  Corporation,  a
Minnesota  corporation  ("Video"),  will be held  starting at 10:00 a.m.,  local
time,  on February 6, 1997,  at the offices of Winthrop &  Weinstine,  3000 Dain
Bosworth  Plaza,  60 South  Sixth  Street,  Minneapolis,  Minnesota  (the "Video
Meeting").  Attendance at the Video Meeting will be limited to  shareholders  of
record on January 10, 1997, or their proxies, beneficial owners having evidenced
ownership on that date, and invited guests of Video.

    

         The purposes of the meeting are:

                  1. To consider and vote upon a proposal (the "Video Proposal")
         to approve  and adopt an Amended  and  Restated  Agreement  and Plan of
         Reorganization and Merger, dated as of November 27, 1996, as amended by
         Amendment  No.  1  to  Amended  and  Restated  Agreement  and  Plan  of
         Reorganization and Merger,  dated as of January 10, 1997 (collectively,
         the "Merger  Agreement"),  among  Video,  Knogo North  America  Inc., a
         Delaware  corporation  ("Knogo"),   Sentry  Technology  Corporation,  a
         Delaware  corporation  ("Sentry"),  Viking  Merger  Corp.,  a Minnesota
         corporation  and a  wholly-owned  subsidiary of Sentry  ("Video  Merger
         Corp."),   and  Strip  Merger  Corp.,  a  Delaware  corporation  and  a
         wholly-owned  subsidiary of Sentry ("Knogo Merger  Corp.").  The Merger
         Agreement contemplates, among other things, that (a) Video Merger Corp.
         will be merged  with and into Video,  and Knogo  Merger  Corp.  will be
         merged with and into  Knogo,  with the result that Video and Knogo each
         will become  wholly-owned  subsidiaries of Sentry, (b) each outstanding
         share of Video common stock,  par value $0.01 per share ("Video  Common
         Stock"),  will be  converted  into the  right to  receive  one share of
         Sentry  common  stock,  par  value  $0.001  per share  ("Sentry  Common
         Stock"),  and (c) each outstanding 1.2022 shares of Knogo common stock,
         par value $0.01 per share,  will be converted into the right to receive
         one share of Sentry  Common  Stock plus one share of Class A  Preferred
         Stock of Sentry, par value $0.001 per share; and

                  2. To transact such other business as may properly come before
         the Video Meeting or at any adjournments or postponements thereof.

         The terms of the  Video  Proposal  and the  Sentry  Common  Stock to be
issued in connection therewith are described in detail in the accompanying Joint
Proxy  Statement/Prospectus.  To ensure that your vote will be  counted,  please
complete,  date and sign the  enclosed  proxy card and return it promptly in the
enclosed  postage-paid  envelope,  whether  or not you plan to attend  the Video
Meeting.  You may revoke your proxy in the manner  described in the accompanying
Joint  Proxy  Statement/Prospectus  at any time  before it is voted at the Video
Meeting.

         Holders  of  record of  shares  of Video  Common  Stock at the close of
business  on January  10,  1997,  the  record  date for the Video  Meeting,  are
entitled to notice of and to vote at the Video  Meeting or at any  postponements
or adjournments  thereof.  The affirmative  vote of the holders of a majority of
the  outstanding  shares of Video  Common Stock is required to approve the Video
Proposal.

                                            By Order of the Board of Directors

                                            Ronald W. McClurg
                                            Secretary
Eden Prairie, Minnesota
   
January 23, 1997
    


<PAGE>

                                    IMPORTANT

         Whether or not you plan to attend the Video  Meeting in person,  please
complete,  sign, date and return the enclosed Proxy Card as soon as possible.  A
return envelope is provided for your  convenience.  You may revoke your Proxy at
any time  before it is voted by  delivering  to the  Secretary  of Video at 6365
Carlson Drive, Eden Prairie,  Minnesota 55346 a signed notice of revocation or a
later dated signed Proxy Card or by  attending  the Video  Meeting and voting in
person.

           DO NOT SEND IN ANY STOCK CERTIFICATES WITH YOUR PROXY CARD.

<PAGE>

                                  [KNOGO LOGO]

Dear Knogo Stockholder:

   
         You are cordially  invited to attend a Special  Meeting of stockholders
of Knogo North America Inc.  ("Knogo") to be held at 11:00 a.m.,  New York time,
on February 6, 1997  at Knogo's corporate headquarters,  350 Wireless Boulevard,
Hauppauge,  New York (the  "Knogo  Meeting"). I hope that you will be present or
represented by proxy at this important meeting.


         At the Knogo  Meeting,  you will be asked to approve  the  Amended  and
Restated Agreement and Plan of Reorganization  and Merger,  dated as of November
27, 1996,  as amended by Amendment  No. 1 to Amended and Restated  Agreement and
Plan of Reorganization and Merger,  dated as of January 10, 1997  (collectively,
the "Merger Agreement"), among Knogo, Video Sentry Corporation ("Video"), Sentry
Technology Corporation ("Sentry"), Viking Merger Corp. and Strip Merger Corp.

    

         As more fully set forth in the  Merger  Agreement  and the Joint  Proxy
Statement/Prospectus  which  accompany  this letter,  the Boards of Directors of
Knogo and Video have agreed on a merger between their two companies.  The Boards
believe that the merger will strengthen the business prospects of both companies
and as a result will benefit their  stockholders.  I urge you to carefully  read
the accompanying materials as you consider your vote on the merger.

         When the merger is completed,  Knogo and Video will become wholly-owned
subsidiaries of Sentry. Sentry is a holding company that was recently formed for
purposes of the proposed merger. After the merger,  Sentry will be headquartered
in Hauppauge, New York.

         As a result of the  merger,  each  1.2022  outstanding  shares of Knogo
common  stock will be  converted  into the right to receive  one share of Sentry
common stock plus one share of Sentry Class A preferred stock.  Each outstanding
share of Video  common  stock will be  converted  into the right to receive  one
share of Sentry common stock.

   
         The Board of Directors of Knogo has received the written opinion, dated
October 10, 1996, of Knogo's  financial  advisor,  Donald & Co.  Securities Inc.
that as of such  date and based  upon and  subject  to  certain  matters  stated
therein, the consideration to be received in the merger by Knogo stockholders is
fair to such holders from a financial  point of view. Such opinion was confirmed
as of January 21, 1997.
    

         Your Board of Directors, after careful consideration,  has approved the
Merger Agreement and the transactions  contemplated thereby. Your Board believes
that the merger is fair to and in the best interests of Knogo  stockholders.  As
such, your Board of Directors unanimously  recommends that you vote FOR approval
of the Merger Agreement and the transactions contemplated thereby.

         Knogo  stockholders  are  entitled  to vote all shares of Knogo  common
stock held by them on January 10,  1997,  which is the record date for the Knogo
Meeting.

         YOUR VOTE IS VERY IMPORTANT. Regardless of the number of shares you may
own, it is important that they are  represented and voted. If you fail to return
the  enclosed  proxy card,  the effect in most cases will be a vote  against the
merger.  Therefore,  whether or not you plan to attend the Knogo Meeting, please
sign, date and mail, as soon as possible, your proxy card in the return envelope
provided.  If you sign, date and mail your proxy card without indicating how you
want to vote,  your vote will be counted as a vote in favor of the  merger.  You
may, of course,  attend the Knogo  Meeting and vote in person,  even if you have
previously returned a proxy card.

         Your cooperation is appreciated.

                                           Sincerely,

                                           THOMAS A. NICOLETTE
                                           President and Chief Executive Officer

   
January 23, 1997
    

<PAGE>


                            KNOGO NORTH AMERICA INC.
                             350 Wireless Boulevard
                            Hauppauge, New York 11788


                               ------------------

   
                    NOTICE OF SPECIAL MEETING OF STOCKHOLDERS
                           TO BE HELD FEBRUARY 6, 1997

                               ------------------


         NOTICE IS HEREBY GIVEN that a Special  Meeting of Stockholders of Knogo
North America Inc. ("Knogo") will be held at Knogo's corporate headquarters, 350
Wireless Boulevard, Hauppauge, New York, on February 6, 1997, at 11:00 a.m., New
York time (the "Knogo Meeting"), for the following purposes:

                  1. To  consider  and vote on a  proposal  (the  "Knogo  Merger
         Proposal") to approve and adopt the Amended and Restated  Agreement and
         Plan of  Reorganization  and Merger,  dated as of November 27, 1996, as
         amended by Amendment  No. 1 to Amended and Restated  Agreement and Plan
         of   Reorganization   and   Merger,   dated  as  of  January  10,  1997
         (collectively, the "Merger Agreement"), among Video Sentry Corporation,
         a   Minnesota   corporation   ("Video"),   Knogo,   Sentry   Technology
         Corporation, a Delaware corporation recently formed to act as a holding
         company  ("Sentry"),  Viking  Merger  Corp.,  a  Minnesota  corporation
         ("Video Merger Corp."),  and Strip Merger Corp., a Delaware corporation
         ("Knogo Merger Corp."), and the transactions contemplated by the Merger
         Agreement, pursuant to which:
    

                           (a) Knogo Merger  Corp.  will be merged with and into
                  Knogo,  leaving Knogo as a  wholly-owned  subsidiary of Sentry
                  (the "Knogo Merger");

                           (b) Video Merger  Corp.  will be merged with and into
                  Video,  leaving Video as a wholly- owned  subsidiary of Sentry
                  and a sister  corporation  of Knogo (the "Video  Merger"  and,
                  collectively with the Knogo Merger, the "Merger");

                           (c) Each 1.2022 shares of common stock of Knogo,  par
                  value $0.01 per share (the "Knogo Common Stock"),  outstanding
                  at the  effective  time of the Knogo  Merger will be converted
                  into the right to receive merger  consideration in the form of
                  one share of common  stock of  Sentry,  par value  $0.001  per
                  share (the "Sentry  Common  Stock"),  and one share of Class A
                  preferred stock of Sentry, par value $0.001 per share, as more
                  fully    described   in   the    accompanying    Joint   Proxy
                  Statement/Prospectus;

                           (d) Each  share of common  stock of Video,  par value
                  $0.01 per  share,  outstanding  at the  effective  time of the
                  Video  Merger  will be  converted  into the  right to  receive
                  merger consideration in the form of one share of Sentry Common
                  Stock, as more fully described in the accompanying Joint Proxy
                  Statement/Prospectus;

         subject to and as more fully  described  in the Merger  Agreement,  the
         full text of which is attached hereto as Appendix A to the accompanying
         Joint Proxy Statement/Prospectus; and

                  2. To transact such other business as may properly come before
         the Knogo Meeting or any adjournment thereof.

         Only  holders of Knogo  Common Stock of record at the close of business
on January 10, 1997 (the "Knogo  Record  Date") are entitled to notice of and to
vote at the Knogo Meeting or any adjournments or postponements thereof. Approval
of the matters to be voted upon in connection with the Knogo Merger requires the
affirmative


<PAGE>

vote of a majority of the  outstanding  shares of Knogo Common Stock entitled to
vote thereon, in person or by proxy, at the Knogo Meeting.

                                           By Order of the Board of Directors,

                                           PETER J. MUNDY
                                           Secretary


   
Hauppauge, New York
January 23, 1997
    


         PLEASE MARK,  SIGN, DATE AND RETURN THE  ACCOMPANYING  FORM OF PROXY AS
         PROMPTLY AS POSSIBLE IN THE ENCLOSED ENVELOPE,  WHETHER OR NOT YOU PLAN
         TO ATTEND  THE KNOGO  MEETING.  YOUR  PROXY MAY BE  REVOKED,  EITHER IN
         WRITING OR BY VOTING IN PERSON AT THE KNOGO MEETING,  AT ANY TIME PRIOR
         TO THE EXERCISE OF THE PROXY.

THE BOARD OF DIRECTORS OF KNOGO UNANIMOUSLY  RECOMMENDS THAT KNOGO  STOCKHOLDERS
VOTE TO APPROVE THE MATTERS TO BE VOTED UPON AT THE KNOGO MEETING.

           PLEASE DO NOT SEND IN ANY SHARE CERTIFICATES AT THIS TIME.

<PAGE>

      [LOGO]                                                   [LOGO]
VIDEO SENTRY CORPORATION                               KNOGO NORTH AMERICA INC.

   
                              JOINT PROXY STATEMENT
                             For Special Meetings of
                    Shareholders of Video Sentry Corporation
                                       and
                    Stockholders of Knogo North America Inc.
                           to be held February 6, 1997
    
                              ---------------------
                                   [NEW LOGO]

                          Sentry Technology Corporation

                                   PROSPECTUS
   
         This   Joint   Proxy    Statement/Prospectus    (the    "Joint    Proxy
Statement/Prospectus")  is being  furnished  to holders of common stock of Video
Sentry Corporation,  a Minnesota corporation  ("Video"),  in connection with the
solicitation  of proxies by the Board of Directors of Video (the "Video  Board")
for use at its special  meeting of  shareholders to be held on February 6, 1997,
or any adjournment or postponement thereof (the "Video Meeting"), and to holders
of common stock of Knogo North America Inc., a Delaware  corporation  ("Knogo"),
in  connection  with the  solicitation  of proxies by the Board of  Directors of
Knogo (the "Knogo Board") for use at its special  meeting of  stockholders to be
held on February 6, 1997, or any adjournment or postponement thereof (the "Knogo
Meeting," and together with the Video Meeting, the "Special Meetings").

         The Video  Meeting has been called to consider and vote upon a proposal
(the "Video  Proposal")  to approve and adopt an Amended and Restated  Agreement
and Plan of Reorganization and Merger, dated as of November 27, 1996, as amended
by Amendment No. 1 to Amended and Restated  Agreement and Plan of Reorganization
and Merger, dated as of January 10, 1997 (collectively, the "Merger Agreement"),
by and among Video, Knogo, Sentry Technology Corporation, a Delaware corporation
("Sentry"),  Viking Merger Corp.,  a Minnesota  corporation  and a  wholly-owned
subsidiary of Sentry ("Video Merger Corp."),  and Strip Merger Corp., a Delaware
corporation  and a wholly-owned  subsidiary of Sentry  ("Knogo  Merger  Corp."),
which provides that, among other things,  Video Merger Corp. will merge with and
into Video  (the  "Video  Merger"),  as a result of which  Video  will  become a
wholly-owned subsidiary of Sentry.
    

         The Knogo  Meeting has been called to consider and vote upon a proposal
(the  "Knogo  Proposal"),  to  approve  and adopt the  Merger  Agreement,  which
provides that,  among other things,  Knogo Merger Corp. will merge with and into
Knogo  (the  "Knogo  Merger"),  as  a  result  of  which  Knogo  will  become  a
wholly-owned subsidiary of Sentry.

         The  reorganization of the business of Video and Knogo  contemplated by
the Merger  Agreement is referred to herein as the  "Merger." As a result of the
Merger, each of Video and Knogo will become a wholly-owned subsidiary of Sentry.

         This Joint Proxy  Statement/Prospectus  also serves as a prospectus  of
Sentry with respect to up to (i)  9,643,685  shares of common  stock,  par value
$0.001 per share (the "Sentry Common Stock"),  that will be issued to holders of
outstanding  shares of Video Common Stock, par value $0.01 per share (the "Video
Common  Stock"),  upon  consummation  of the  Video  Merger  and to  holders  of
outstanding  shares of Knogo Common Stock, par value $0.01 per share (the "Knogo
Common Stock"), upon consummation of the Knogo Merger, and (ii) 4,801,723 shares
of Class A Preferred  Stock of Sentry,  par value  $0.001 per share (the "Sentry
Class A Preferred Stock"),  that will be issued to holders of outstanding shares
of Knogo Common Stock upon consummation of the Merger. See "THE MERGER AGREEMENT
- -- Conversion of Video Common Stock" and "THE MERGER  AGREEMENT -- Conversion of
Knogo Common Stock."

   
         This Joint Proxy  Statement/Prospectus  and accompanying  form of proxy
are first being  mailed to the  shareholders  of Video and the  stockholders  of
Knogo on or about January 23, 1997.
    

         THE   SECURITIES   TO  BE  ISSUED   PURSUANT   TO  THIS   JOINT   PROXY
STATEMENT/PROSPECTUS HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE COMMISSION OR
ANY STATE  SECURITIES  COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF THIS
JOINT  PROXY  STATEMENT/PROSPECTUS.  ANY  REPRESENTATION  TO THE  CONTRARY  IS A
CRIMINAL OFFENSE.

   
     The date of this Joint Proxy Statement/Prospectus is January 21, 1997.
    

<PAGE>

                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----

   
AVAILABLE INFORMATION .....................................................    v
    

SUMMARY ...................................................................    1
     The Companies ........................................................    1
     The Special Meetings .................................................    1
     The Merger Agreement .................................................    2
     The Merger ...........................................................    4
     Risk Factors .........................................................    5
     Summary Selected Historical and Unaudited Pro Forma
     Combined Condensed Financial Information .............................    6
     Comparative Per Share Data ...........................................    9
     Comparative Market Prices and Dividends ..............................   10
     Listing of Sentry Common Stock and Sentry Class A Preferred Stock ....   10

CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS .................   11

RISK FACTORS ..............................................................   11
     Risks Relating to the Merger .........................................   11
     Risks Relating to Sentry .............................................   12

THE SPECIAL MEETINGS ......................................................   19
     Times and Places; Purposes ...........................................   19
     Voting Rights; Votes Required for Approval ...........................   19
     Proxies ..............................................................   20

THE MERGER ................................................................   22
     Certain Effects of the Merger Upon Video .............................   22
     Certain Effects of the Merger Upon Knogo .............................   22
     Background ...........................................................   22
     Recommendation of Video Board; Video's Reasons for the Merger ........   25
     Recommendation of Knogo Board; Knogo's Reasons for the Merger ........   26
     Fairness Opinions ....................................................   28
     Interests of Certain Persons in the Merger ...........................   34
     Accounting Treatment .................................................   36
     Certain Federal Income Tax Consequences ..............................   36
     Stock Exchange Listing ...............................................   39
     Federal Securities Laws Consequences .................................   39
     Dissenters' Rights ...................................................   40

THE MERGER AGREEMENT ......................................................   44
     The Mergers ..........................................................   44
     Conversion of Video Common Stock .....................................   44
     Conversion of Knogo Common Stock .....................................   45
     Exchange Procedure ...................................................   45
     Certain Representations and Warranties ...............................   46
     Certain Covenants ....................................................   46
     Closing Conditions ...................................................   50
     Termination ..........................................................   50

BUSINESS OF VIDEO .........................................................   52
     General ..............................................................   52
     Business Strategy ....................................................   52
     Market Overview ......................................................   53
     Current Products .....................................................   54
     Customer Applications ................................................   55

                                        i

<PAGE>

                                                                            Page
                                                                            ----

     Customers ............................................................   56
     Sales, Marketing and Customer Service ................................   57
     Product Development ..................................................   57
     Manufacturing and Installation .......................................   58
     Competition ..........................................................   58
     Patents and Intellectual Property ....................................   58
     Employees ............................................................   59
     Facilities ...........................................................   59
     Legal Proceedings ....................................................   59
     Committees of the Board of Directors .................................   59
     Director Compensation ................................................   59
     Executive Compensation ...............................................   60
     Employment Agreements ................................................   60
     Stock Options ........................................................   60
     Stock Purchase Plan ..................................................   61
     Profit Sharing Plan ..................................................   61
     Indemnification and Waiver of Director Liability .....................   61

VIDEO MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS .............................   62
     Overview .............................................................   62
     Results of Operations ................................................   62
     Net Operating Loss Carryforward ......................................   64
     Liquidity and Capital Resources ......................................   64
     Inflation ............................................................   65

VIDEO SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT ......   66

CERTAIN TRANSACTIONS OF VIDEO .............................................   67

BUSINESS OF KNOGO .........................................................   68
     General ..............................................................   68
     EAS Systems ..........................................................   69
     Other Loss Prevention Products .......................................   70
     Production ...........................................................   70
     Marketing ............................................................   71
     Service ..............................................................   72
     Competition ..........................................................   72
     Patents and Other Intellectual Property ..............................   72
     Research and Development .............................................   73
     Regulation ...........................................................   73
     Employees ............................................................   73
     Director Compensation ................................................   73
     Executive Compensation ...............................................   74
     Summary Compensation Table ...........................................   75
     Knogo Options Granted in Last Fiscal Year ............................   75
     Knogo Aggregated Option Exercises in Last Fiscal Year and
          Fiscal Year End Option Values ...................................   76
     Knogo Executive Employment Agreements; Change In Control Arrangements    76
     Properties ...........................................................   77
     Legal Proceedings ....................................................   77

KNOGO MANAGEMENT'S DISCUSSION AND ANALYSIS OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS .............................   78
     Results of Operations ................................................   78
     Liquidity and Capital Resources ......................................   81
     Inflation ............................................................   82

                                       ii

<PAGE>

                                                                            Page
                                                                            ----

     Recent Accounting Pronouncements........................................ 82

KNOGO SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
OWNERS AND MANAGEMENT........................................................ 83

CERTAIN TRANSACTIONS OF KNOGO................................................ 84

BUSINESS OF SENTRY........................................................... 85

MANAGEMENT OF SENTRY......................................................... 86
     Directors............................................................... 86
     Compensation of Directors............................................... 87
     Committees of the Board of Directors.................................... 87
     Officers................................................................ 88
     Sentry Employment Agreements and Compensation of Executive Officers..... 88
     Sentry 1997 Stock Incentive Plan........................................ 89
     Sentry Retirement Savings 401(k) Plan................................... 95

   
SENTRY SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
OWNERS AND MANAGEMENT........................................................ 96
    

COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION.................. 97

SELECTED HISTORICAL FINANCIAL INFORMATION OF VIDEO........................... 98

SELECTED HISTORICAL FINANCIAL INFORMATION OF KNOGO........................... 99

UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS..................100

COMPARISON OF STOCKHOLDERS' RIGHTS WITH RESPECT TO SENTRY AND VIDEO..........106

COMPARISON OF STOCKHOLDERS' RIGHTS WITH RESPECT TO SENTRY AND KNOGO..........113

DESCRIPTION OF SENTRY CAPITAL STOCK..........................................114
     Authorized Capital Stock................................................114
     Common Stock............................................................114
     Preferred Stock.........................................................115
     Certain Charter and By-Law Provisions ..................................118
     Transfer Agent and Registrar............................................119

LEGAL MATTERS................................................................120

EXPERTS......................................................................120

FUTURE STOCKHOLDER PROPOSALS.................................................120


                                       iii

<PAGE>


       

   
APPENDIX A -  Amended and  Restated  Agreement  and Plan of  Reorganization  and
              Merger, dated as of November 27, 1996, together with Amendment No.
              1 to Amended and Restated Agreement and Plan of Reorganization and
              Merger,   dated  as  of  January  10,  1997  among  Video   Sentry
              Corporation,   Knogo  North   America  Inc.,   Sentry   Technology
              Corporation, Viking Merger Corp. and Strip Merger Corp.
    

APPENDIX B -  Fairness Opinion of Alex. Brown & Sons Incorporated

APPENDIX C -  Fairness Opinion of Donald & Co. Securities Inc.

APPENDIX D -  Section 302A.473 of the Minnesota Business Corporation Act

APPENDIX E -  Section 262 of the Delaware General Corporation Law

   
APPENDIX F -  Form of Amended  and  Restated  Certificate  of  Incorporation  of
              Sentry;  Form of  Certificate  of  Designations  of Sentry Class A
              Preferred Stock

APPENDIX G -  Form of Bylaws of Sentry
    
APPENDIX H -  Form of Proxy of Video Sentry Corporation

APPENDIX I -  Form of Proxy of Knogo North America Inc.

                                       iv

<PAGE>

         No  person  has been  authorized  to give any  information  or make any
representation not contained in this Joint Proxy Statement/Prospectus and, if so
given or made,  such  information or  representation  must not be relied upon as
having  been  authorized.   This  Joint  Proxy   Statement/Prospectus  does  not
constitute an offer to sell or a solicitation  of an offer to buy any securities
other than those to which it relates or an offer to sell or a solicitation of an
offer to buy any securities in any  jurisdiction  in which,  or to any person to
whom, it is unlawful to make such offer or solicitation. Neither the delivery of
this Joint Proxy  Statement/Prospectus  nor the sale of any securities hereunder
shall,  under any  circumstances,  create an implication  that there has been no
change  in the  affairs  of Video or Knogo  since  the date  hereof  or that the
information herein is correct as of any time subsequent to its date.

                              AVAILABLE INFORMATION

         Video and Knogo are each subject to the  informational  requirements of
the  Securities  Exchange Act of 1934, as amended (the "Exchange  Act"),  and in
accordance  therewith file reports,  proxy statements and other information with
the Securities and Exchange Commission (the "Commission").  Such reports,  proxy
statements and other  information filed with the Commission can be inspected and
copied at the public reference  facilities  maintained by the Commission at Room
1024, 450 Fifth Street, N.W., Judiciary Plaza, Washington, D.C. 20549 and at the
following Regional Offices of the Commission:  Citicorp Center, 500 West Madison
Street,  Suite 1400,  Chicago,  Illinois  60661 and 7 World Trade Center,  Suite
1300,  New York,  New York  10048.  Copies of such  material  can be obtained at
prescribed  rates from the Public  Reference  Section of the  Commission  at 450
Fifth Street, N.W., Judiciary Plaza,  Washington,  D.C. 20549. Copies of certain
Commission  filings may also be obtained through  commercial  document retrieval
services and through the  Commission's  Web site located at  http://www.sec.gov.
Video Common Stock is listed on the NASDAQ Stock Market's  SmallCap  Market (the
"NASDAQ  SmallCap")  and such  material  may be  inspected at the offices of the
National  Association  of  Securities  Dealers,   Inc.,  1735  K  Street,  N.W.,
Washington,  D.C.  20006.  Knogo Common  Stock is listed on the  American  Stock
Exchange  (the "AMEX") and such  material may be inspected at the offices of the
AMEX, 86 Trinity Place,  New York,  New York 10006.  After  consummation  of the
Merger,  Video and Knogo will no longer file reports,  proxy statements or other
information with the Commission. Instead, such information would be provided, to
the extent required, in filings made by Sentry.

         Sentry has filed with the Commission a  registration  statement on Form
S-4 under the Securities Act of 1933, as amended (the "Act"), relating to shares
of Sentry  Common Stock and Sentry Class A Preferred  Stock that are proposed to
be issued in  connection  with the Merger to holders of Video  Common  Stock and
Knogo  Common  Stock  (together  with all  amendments,  exhibits  and  schedules
thereto, the "Registration Statement").  See "THE MERGER AGREEMENT -- Conversion
of Video Common  Stock" and "THE MERGER  AGREEMENT -- Conversion of Knogo Common
Stock."  This  Joint  Proxy  Statement/Prospectus  does not  contain  all of the
information  set forth in the  Registration  Statement  filed by Sentry with the
Commission,  certain  portions of which are omitted in accordance with the rules
and regulations of the Commission.  Such additional information is available for
inspection and copying at the offices of the Commission. Statements contained in
this Joint Proxy  Statement/Prospectus  as to the  contents  of any  contract or
other  document  referred to herein are not  necessarily  complete,  and in each
instance  reference is made to the copy of such contract or other document filed
as an exhibit to the  Registration  Statement or such other document,  each such
statement being qualified in all respects by such reference.

   
                                       v
    
<PAGE>

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                                     SUMMARY

         The following summary is intended only to highlight certain information
contained  elsewhere in this Joint Proxy  Statement/Prospectus.  This summary is
not  intended  to be  complete  and is  qualified  in its  entirety  by the more
detailed    information    contained    elsewhere    in   this    Joint    Proxy
Statement/Prospectus,  the  Appendices  hereto  and the  documents  referred  to
herein. Shareholders of Video and stockholders of Knogo are urged to review this
entire Joint Proxy  Statement/Prospectus  carefully,  including  the  Appendices
hereto and such other documents.

The Companies

         Video.  Video designs,  manufactures  and markets a patented  traveling
closed circuit television ("CCTV") surveillance system which continues to be the
only proven,  commercially accepted traveling CCTV system available. This system
provides  complete  coverage for retail  register lanes and aisles,  stockrooms,
shipping and receiving,  distribution,  industrial and commercial facilities and
for parking  garages.  The system consists of one or two  pan/tilt/zoom  ("PTZ")
cameras.  The patented  traveling  CCTV system,  along with other  complementary
products  provided by Video,  have proven  well suited for loss  prevention  and
theft detection in retail stores, home centers,  distribution  centers,  parking
garages, commercial/industrial and other applications. Video was founded in 1990
and made its first  sales in 1992.  The  mailing  address of  Video's  principal
executive  office is 6365 Carlson Drive,  Eden Prairie,  Minnesota,  55346;  its
telephone number is (612) 934-9900. See "BUSINESS OF VIDEO."

         Knogo.  Knogo  designs,  manufactures,  sells,  installs and services a
complete line of electronic article surveillance ("EAS") equipment in the United
States,  Canada and Puerto Rico.  Knogo's  products are primarily used to detect
and deter shoplifting and employee theft in supermarket,  department,  discount,
specialty and various other types of retail stores including bookstores,  video,
liquor,  drug, shoe and sporting goods stores. In addition,  Knogo's EAS systems
are used in  non-retail  establishments  to detect  and deter  theft,  in office
buildings to control the loss of office  equipment and other assets,  in nursing
homes for patient  control,  in hospitals for control of linen supplies and in a
variety  of other hard goods  applications.  Knogo was formed in August  1994 as
part of a  spin-off  transaction.  Knogo's  corporate  predecessor  had  been in
business for nearly 30 years. The mailing address of Knogo's principal executive
office is 350  Wireless  Boulevard,  Hauppauge,  New York 11788;  its  telephone
number is (516) 232-2100. See "BUSINESS OF KNOGO."

   
         Sentry.   Sentry  is  a  newly  formed   Delaware   corporation  and  a
wholly-owned subsidiary of Video that has not, to date, conducted any activities
other  than  those  incident  to its  formation,  its  execution  of the  Merger
Agreement,   its   participation   in  the   preparation  of  this  Joint  Proxy
Statement/Prospectus   and  other   actions  taken  in   contemplation   of  the
consummation  of the Merger.  As a result of the Merger,  Video Merger Corp. and
Knogo Merger Corp.,  wholly-owned  subsidiaries  of Sentry,  will merge with and
into Video and Knogo, respectively, and Video and Knogo will become wholly-owned
subsidiaries of Sentry. Accordingly, the business of Sentry will be the business
currently  conducted by Video and Knogo.  Upon  consummation  of the Merger (the
"Effective Time"),  the mailing address of Sentry's principal  executive offices
will be 350 Wireless Boulevard,  Hauppauge, New York 11788; its telephone number
will be (516) 232-2100. See "BUSINESS OF SENTRY."
    

The Special Meetings

   
         Video.  The Video  Meeting  will be held at the  offices of  Winthrop &
Weinstine,  3000  Dain  Bosworth  Plaza,  60 South  Sixth  Street,  Minneapolis,
Minnesota  on February 6,  1997,  starting at 10:00 a.m.,  local time.  See "THE
SPECIAL  MEETINGS." At the Video Meeting,  holders of Video Common Stock will be
asked to approve and adopt the Video Proposal.  The Merger Agreement is attached
hereto as Appendix A. See "THE MERGER" and "THE MERGER AGREEMENT."
    

         Holders of record of Video  Common  Stock at the close of  business  on
January 10, 1997 (the "Video Record  Date") have the right to receive  notice of
and to vote at the Video Meeting. On the Video Record Date, there were 4,841,962
shares of Video Common  Stock  outstanding  and entitled to vote.  Each share of
Video  Common  Stock is  entitled  to one vote on each  matter  that is properly
presented to shareholders for a vote at the Video Meeting. 

- --------------------------------------------------------------------------------

<PAGE>

- --------------------------------------------------------------------------------

Under Video's Amended and Restated Bylaws (the "Video Bylaws") and the Minnesota
Business  Corporation Act (the  "Minnesota  Act"),  the affirmative  vote of the
holders  of a  majority  of the  outstanding  shares  of Video  Common  Stock is
required to approve and adopt the Video Proposal.

   
         As of the Video Record Date,  directors and executive officers of Video
as a group  beneficially  owned  1,226,575  shares  of Video  Common  Stock,  or
approximately  24.2% of those  shares  outstanding  as of the Video Record Date.
Video has been advised that all of its directors and executive  officers  intend
to vote their shares in favor of the Video Proposal.  Certain Video shareholders
holding an aggregate of approximately  20.6% of the shares of outstanding  Video
Common Stock have entered into Support/Voting Agreements with Knogo, under which
these  shareholders  have promised to vote in favor of the Merger and the Merger
Agreement  at the Video  Meeting.  See "THE SPECIAL  MEETINGS -- Voting  Rights;
Votes Required for Approval -- Video."

         Knogo.   The  Knogo  Meeting   will  be  held  at  Knogo's   crorporate
headquarters,  350 Wireless Boulevard, Hauppauge, New York, on February 6, 1997,
starting at 11:00 a.m.  local time.  See "THE  SPECIAL  MEETINGS."  At the Knogo
Meeting,  holders of Knogo  Common  Stock will be asked to approve and adopt the
Knogo Proposal.  The Merger Agreement is attached hereto as Appendix A. See "THE
MERGER" and "THE MERGER AGREEMENT."

    

         Holders of record of Knogo  Common  Stock at the close of  business  on
January 10, 1997 (the "Knogo Record  Date") have the right to receive  notice of
and to vote at the Knogo Meeting. On the Knogo Record Date, there were 5,772,632
shares of Knogo Common  Stock  outstanding  and entitled to vote.  Each share of
Knogo  Common  Stock is  entitled  to one vote on each  matter  that is properly
presented to stockholders for a vote at the Knogo Meeting.  Under Knogo's Bylaws
and the Delaware General  Corporation Law (the "DGCL"),  the affirmative vote of
the holders of a majority of the  outstanding  shares of Knogo  Common  Stock is
required to approve and adopt the Knogo Proposal.

         As of the Knogo Record Date,  directors and executive officers of Knogo
as a group  beneficially  owned  1,392,344  shares  of Knogo  Common  Stock,  or
approximately  23.5% of those  shares  outstanding  as of the Knogo Record Date.
Knogo has been advised that all of its directors and executive  officers  intend
to vote their shares in favor of the Knogo Proposal.  Certain Knogo stockholders
holding an aggregate of  approximately  32% of the  outstanding  shares of Knogo
Common Stock have entered into Support/Voting Agreements with Video, under which
these  stockholders  have promised to vote in favor of the Merger and the Merger
Agreement  at the Knogo  Meeting.  See "THE SPECIAL  MEETINGS -- Voting  Rights;
Votes Required for Approval -- Knogo."

The Merger Agreement

         General.  The Merger Agreement  provides,  among other things, for: (a)
the merger of Video  Merger  Corp.  with and into  Video,  which will  result in
Video,  as the  surviving  corporation,  becoming a  wholly-owned  subsidiary of
Sentry, and (b) the merger of Knogo Merger Corp. with and into Knogo, which will
result  in  Knogo,  as  the  surviving  corporation,   becoming  a  wholly-owned
subsidiary of Sentry.

         Consideration to be Received by Video Shareholders in the Merger.  Upon
consummation of the Merger, each outstanding share of Video Common Stock will be
converted into the right to receive one share of Sentry Common Stock. Each share
of Video Common Stock which is held in the  treasury of Video  ("Video  Treasury
Stock")  will be  canceled  and cease to exist.  See "THE  MERGER  AGREEMENT  --
Conversion of Video Common Stock." For a description of the Sentry Common Stock,
see  "DESCRIPTION  OF SENTRY  CAPITAL  STOCK."  For a summary  of the  principal
differences  between the rights of holders of Sentry Common Stock and holders of
Video Common Stock,  see  "COMPARISON  OF  STOCKHOLDERS'  RIGHTS WITH RESPECT TO
SENTRY AND VIDEO."

         AT THE EFFECTIVE TIME, EACH SHARE OF VIDEO COMMON STOCK SHALL REPRESENT
THE RIGHT TO  RECEIVE AN  EQUIVALENT  NUMBER OF SHARES OF SENTRY  COMMON  STOCK.
HOLDERS OF VIDEO  COMMON  STOCK  SHOULD NOT SEND ANY  CERTIFICATES  REPRESENTING
VIDEO COMMON STOCK WITH THE ENCLOSED PROXY CARD.

- --------------------------------------------------------------------------------

                                       2
<PAGE>

- --------------------------------------------------------------------------------

         Consideration to be Received by Knogo Stockholders in the Merger.  Upon
consummation of the Merger, each outstanding 1.2022 shares of Knogo Common Stock
will be converted into the right to receive one share of Sentry Common Stock and
one share of Sentry Class A Preferred Stock, which has a face value per share of
$5.00 (the "Face Value").  Each share of Knogo Common Stock which is held in the
treasury of Knogo ("Knogo  Treasury Stock") will be canceled and cease to exist.
See  "THE  MERGER  AGREEMENT  --  Conversion  of  Knogo  Common  Stock."  For  a
description  of the Sentry Common Stock and the Sentry Class A Preferred  Stock,
see  "DESCRIPTION  OF SENTRY  CAPITAL  STOCK."  For a summary  of the  principal
differences  between the rights of holders of Sentry Common Stock and holders of
Knogo Common Stock,  see  "COMPARISON  OF  STOCKHOLDERS'  RIGHTS WITH RESPECT TO
SENTRY AND KNOGO."

         AT THE EFFECTIVE  TIME,  EACH 1.2022 SHARES OF KNOGO COMMON STOCK SHALL
REPRESENT THE RIGHT TO RECEIVE ONE SHARE OF SENTRY COMMON STOCK AND ONE SHARE OF
SENTRY  CLASS A PREFERRED  STOCK.  HOLDERS OF KNOGO COMMON STOCK SHOULD NOT SEND
ANY CERTIFICATES REPRESENTING KNOGO COMMON STOCK WITH THE ENCLOSED PROXY CARD.

         Exchange of Shares.  At or prior to the Effective Time, Video and Knogo
will  jointly  appoint an exchange  agent (the  "Exchange  Agent") to effect the
exchange of  certificates  (i)  representing  shares of Video  Common  Stock for
certificates  representing  shares of Sentry Common Stock, and (ii) representing
shares of Knogo  Common  Stock for  certificates  representing  shares of Sentry
Common Stock and Sentry Class A Preferred Stock.

         No fractional  shares of Sentry Common Stock will be issued pursuant to
the Merger.  Fractional  interests  in Sentry  Common  Stock and Sentry  Class A
Preferred  Stock will be aggregated  and sold by the Exchange Agent on behalf of
stockholders  who would  otherwise have been entitled to receive such fractional
shares as soon as  practicable  after the Effective  Time.  Upon such sale,  the
Exchange Agent will deliver to each  stockholder  who would  otherwise have been
entitled to receive a fraction of a share of Sentry  Common Stock and/or  Sentry
Class A Preferred Stock, as the case may be, a cash payment  (without  interest)
representing such stockholder's  proportionate interest in the net proceeds from
the sale. See "THE MERGER AGREEMENT -- Exchange Procedure."

   
         Conditions  to the  Merger.  The  obligations  of  Video  and  Knogo to
consummate  the Merger are  subject to the  fulfillment  of various  conditions,
including, among others: (i) the effectiveness of the Registration Statement and
the  absence of any stop  order  suspending  the  effectiveness  thereof  and no
proceeding  for that  purpose  having been  initiated  by the  Commission;  (ii)
approval by the  stockholders of both Video and Knogo;  and (iii) listing of the
Sentry  Common Stock and the Sentry Class A Preferred  Stock on the NASDAQ Stock
Market's National Market ("NASDAQ") or a national securities  exchange,  subject
only to  official  notice of  issuance.  See "THE  MERGER  AGREEMENT  -- Closing
Conditions."
    

         Termination of the Merger Agreement. The Merger Agreement is subject to
termination  at the  option of either  Video or Knogo if:  (i) the Merger is not
consummated  on or before  April 8, 1997 (and  prior to such time by the  mutual
consent of Video and Knogo),  (ii) the Merger is barred by law, (iii) the Merger
Agreement is not approved by Video's shareholders or Knogo's stockholders,  (iv)
either the Video Board or the Knogo Board shall have withdrawn or modified, in a
manner adverse to the other party, its approval or  recommendation of the Merger
Agreement or the Merger, (v) either the Video Board or the Knogo Board solicits,
directly or  indirectly,  any proposal with respect to a merger,  acquisition or
similar transaction involving the purchase of a significant portion of the stock
or assets of their respective  company (a "Merger  Proposal"),  or (vi) a Merger
Proposal is made which the Video Board or the Knogo  Board,  as the case may be,
determines  it must  accept  in the  exercise  of its  fiduciary  duties  to its
shareholders. The Merger Agreement may be terminated by Knogo, at any time prior
to the  Effective  Time,  if:  (a)  there  has  been a  breach  by  Video of any
representation  or warranty in the Merger  Agreement  which would have, or which
would be reasonably  likely to have, a material  adverse effect on Video; or (b)
there has been a material  breach by Video of any of the covenants or agreements
in the Merger  Agreement  which is not curable or not cured within 30 days after
written notice of the breach.  The Merger  Agreement may be terminated by Video,
at any time  prior to the  Effective  Time,  if:  (x) there has been a breach by
Knogo of any  representation  or  warranty in the Merger  Agreement  which would
have, or which would be reasonably  likely to have, a material adverse effect on
Knogo;  or (y) there has been a material breach by Knogo of any of the covenants
or agreements in the Merger  

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                                        3

<PAGE>

- --------------------------------------------------------------------------------

Agreement  which is not curable or not cured within 30 days after written notice
of the breach. See "THE MERGER AGREEMENT -- Termination."

         Termination  Fee.  If a Merger  Proposal  is made for or  solicited  by
Knogo, or the Knogo Board  withdraws or modifies,  in a manner adverse to Video,
its  approval or  recommendation  of the Merger  Agreement  or the  Merger,  and
thereafter  (i) the Merger  Agreement is  terminated  by Video or Knogo and (ii)
within six months of the termination,  Knogo is a party to a merger, acquisition
or similar  transaction  involving the purchase of a significant  portion of the
stock or assets of Knogo,  then Knogo must pay Video for fees and expenses Video
has  incurred up to  $750,000,  exclusive  of the sharing of costs and  expenses
related to this Joint Proxy Statement/ Prospectus.  See "THE MERGER AGREEMENT --
Termination -- Termination  Fee." If a Merger  Proposal is made for or solicited
by Video,  or the Video Board  withdraws  or  modifies,  in a manner  adverse to
Knogo, its approval or recommendation of the Merger Agreement or the Merger, and
thereafter  (x) the Merger  Agreement  is  terminated  by Video or Knogo and (y)
within six months of the termination,  Video is a party to a merger, acquisition
or similar  transaction  involving the purchase of a significant  portion of the
stock or assets of Video,  then Video must pay Knogo for fees and expenses Knogo
has  incurred up to  $750,000,  exclusive  of the sharing of costs and  expenses
related to this Joint Proxy  Statement/Prospectus.  See "THE MERGER AGREEMENT --
Termination -- Termination Fee."

The Merger

         Ownership of Sentry After the Merger. Immediately following the Merger,
(i) the former  holders of Video Common Stock will  collectively  hold 4,841,962
shares  (approximately  50.2%) of the  issued and  outstanding  shares of Sentry
Common Stock and (ii) the former holders of Knogo Common Stock will collectively
hold 4,801,723 shares (approximately 49.8%) of the issued and outstanding shares
of Sentry Common Stock.  In addition,  the former  holders of Knogo Common Stock
will collectively hold 4,801,723 shares of Sentry Class A Preferred Stock.

         Recommendation  of Video  Board;  Video's  Reasons for the Merger.  The
Video Board,  by unanimous  vote, has determined  that the Merger is in the best
interests of the holders of Video Common  Stock and  recommends  that holders of
Video  Common  Stock vote in favor of the Video  Proposal.  The  decision of the
Video  Board  to  enter  into  the  Merger   Agreement  and  to  recommend  that
shareholders vote in favor of the Video Proposal is based upon its evaluation of
a number of factors  including,  among  others,  the oral opinion  (subsequently
confirmed  in  writing)  of Alex.  Brown & Sons  Incorporated  ("Alex.  Brown"),
Video's investment banker in connection with the Merger, that the Merger is fair
from a financial point of view to the  shareholders of Video. See "THE MERGER --
Recommendation  of Video Board;  Video's Reasons for the Merger" and "THE MERGER
- -- Fairness Opinions -- Opinion of Video's Investment Banker."

         Recommendation  of Knogo  Board;  Knogo's  Reasons for the Merger.  The
Knogo Board,  by unanimous  vote, has determined  that the Merger is in the best
interests of the holders of Knogo Common  Stock and  recommends  that holders of
Knogo  Common  Stock vote in favor of the Knogo  Proposal.  The  decision of the
Knogo  Board  to  enter  into  the  Merger   Agreement  and  to  recommend  that
stockholders vote in favor of the Knogo Proposal is based upon its evaluation of
a number  of  factors  including,  among  others,  the  opinion  of Donald & Co.
Securities Inc.  ("Donald & Co.") that the  consideration  to be received by the
holders of Knogo Common Stock in the Knogo Merger is fair from a financial point
of view. See "THE MERGER -- Recommendation  of Knogo Board;  Knogo's Reasons for
the  Merger"  and "THE  MERGER  --  Fairness  Opinions  --  Opinion  of  Knogo's
Investment Banker."

         Interest of Certain  Persons in the Merger;  Management of Sentry After
the Merger.  Certain members of the managements of Video and Knogo and the Video
Board and Knogo Board have certain  interests  in the Merger that are  different
from,  or in  addition  to, the  interests  of  shareholders  of Video and Knogo
generally. Pursuant to the Merger Agreement, Video and Knogo will each designate
certain executive officers of Sentry. The executive officers of Sentry after the
Merger  will  include  Thomas A.  Nicolette  as  President  and Chief  Executive
Officer,  Andrew  L.  Benson  as  Vice  President  with  responsibility  for the
marketing of CCTV products,  Peter J. Mundy as Chief Financial Officer and Peter
Y. Zhou as Vice President - Technology.  At present, Mr. Benson is the President
of Video, Mr.  Nicolette is the President and Chief Executive  Officer of Knogo,
Mr. Mundy is the Vice President - Finance,  Chief Financial  Officer,  Secretary
and Treasurer of Knogo and Dr. Zhou is the Vice President  -

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                                       4
<PAGE>

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Technology  of Knogo.  In addition,  it is  anticipated  that Mr.  Nicolette,  a
director of Knogo,  William A. Perlmuth,  a director of Knogo,  Robert D. Furst,
Jr.,  Chairman of the Board and Chief Executive  Officer of Video, Mr. Benson, a
director of Video, and Robert L. Barbanell will become directors of Sentry, with
Mr. Perlmuth  serving as Chairman of the Board.  See "THE MERGER -- Interests of
Certain Persons in the Merger."

         Accounting  Treatment.  The  Merger  will be  accounted  for  under the
"purchase" method of accounting in accordance with generally accepted accounting
principles. See "THE MERGER -- Accounting Treatment."

   
         Opinions of  Investment  Bankers.  On October  10,  1996,  Alex.  Brown
rendered to the Video Board its oral opinion (subsequently confirmed in writing)
to the effect that, as of such date,  the Merger is fair to the holders of Video
Common  Stock  from a  financial  point of view.  The full  text of the  written
opinion  of  Alex.  Brown,  confirmed  as  of  the  date  of  this  Joint  Proxy
Statement/Prospectus,  which sets forth assumptions made, factors considered and
limitations on the review  undertaken by Alex.  Brown, is included as Appendix B
to this Joint Proxy  Statement/Prospectus.  Video shareholders are urged to read
such opinion carefully in its entirety.  See "THE MERGER -- Fairness Opinions --
Opinion of Video's Investment Banker."

         On October  10,  1996,  Donald & Co.  rendered  to the Knogo  Board its
written  opinion to the effect that, as of such date,  the Merger is fair to the
holders of Knogo Common Stock from a financial  point of view.  The full text of
the  written  opinion  of Donald & Co.,  confirmed  as of the date of this Joint
Proxy   Statement/Prospectus,   which  sets  forth  assumptions  made,   factors
considered and limitations on the review undertaken by Donald & Co., is included
as Appendix C to this Joint Proxy  Statement/Prospectus.  Knogo stockholders are
urged to read  such  opinion  carefully  in its  entirety.  See "THE  MERGER  --
Fairness Opinions -- Opinion of Knogo's Investment Banker."
    

         Certain  Federal  Income Tax  Consequences.  It is a  condition  to the
consummation  of the Merger that Video  receive an opinion of Dewey  Ballantine,
special counsel to Video, based upon reasonably requested representation letters
and dated the Closing  Date, to the effect that the Video Merger will be treated
for Federal income tax purposes as a reorganization  described in Section 368(a)
of the  Internal  Revenue  Code of 1986,  as amended  (the  "Code")  and/or as a
transfer  of  property  to Sentry by  holders  of shares of Video  Common  Stock
governed by Section 351 of the Code.  It is a condition to the  consummation  of
the Knogo  Merger  that  Knogo  receive an opinion of Stroock & Stroock & Lavan,
counsel to Knogo,  based upon reasonably  requested  representation  letters and
dated the Closing  Date, to the effect that the Knogo Merger will be treated for
Federal  income tax  purposes  as a transfer of property to Sentry by holders of
Knogo Common Stock governed by Section 351 of the Code.

   
         Assuming  that the Video  Merger and the Knogo  Merger are  treated for
Federal income tax purposes in accordance  with those opinions,  in general,  no
gain or loss will be  recognized by a holder of Video Common Stock who exchanges
such stock solely for Sentry  Common Stock  pursuant to the Merger,  except that
gain or  loss  may be  recognized  with  respect  to  cash  received  in lieu of
fractional shares.  Similarly, in general, no gain or loss will be recognized by
a holder of Knogo Common Stock who exchanges such stock solely for Sentry Common
Stock and Sentry  Class A Preferred  Stock  pursuant to the Merger,  except that
gain or  loss  may be  recognized  with  respect  to  cash  received  in lieu of
fractional shares. See "THE MERGER -- Certain Federal Income Tax Consequences."
    

         Dissenters'  Rights.  Holders of Video  Common Stock who do not vote in
favor of the Video Proposal and who have properly complied with Section 302A.473
of the Minnesota Act will be entitled to  dissenters'  rights.  Holders of Knogo
Common Stock will not be entitled to appraisal  rights  because the Knogo Common
Stock is listed on a national  securities  exchange  and the Knogo  stockholders
will  receive as  consideration  for the Knogo  Common  Stock,  shares of Sentry
Common Stock and Sentry  Class A Preferred  Stock which also will be listed on a
national  securities exchange or NASDAQ.  However,  should either or both of the
Sentry  Common  Stock or  Sentry  Class A  Preferred  Stock  not be  listed on a
national  securities  exchange or NASDAQ,  Knogo stockholders who do not vote in
favor of the Knogo  Proposal and who have properly  complied with Section 262 of
the DGCL will be entitled to appraisal  rights.  See "THE MERGER --  Dissenters'
Rights."

- --------------------------------------------------------------------------------

                                       5
<PAGE>

- --------------------------------------------------------------------------------

Risk Factors

         See "RISK  FACTORS"  beginning on page 11 hereof for  information  that
should be considered by shareholders of Video and stockholders of Knogo.

<TABLE>
               Summary Selected Historical and Unaudited Pro Forma
                    Combined Condensed Financial Information

Video Historical Financial Information

         The following table sets forth summary historical financial information
of Video for the periods  indicated  which has been derived from Video's audited
and unaudited  financial  statements.  Unaudited  interim data reflects,  in the
opinion  of  Video's  management,  all  adjustments  (consisting  only of normal
recurring  adjustments)  considered necessary for a fair presentation of results
for such interim  periods.  Results of operations for unaudited  interim periods
are not  necessarily  indicative  of results which may be expected for any other
interim or annual period. The summary historical financial information should be
read  in  conjunction  with  "VIDEO  MANAGEMENT'S  DISCUSSION  AND  ANALYSIS  OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS,"  "SELECTED  HISTORICAL FINANCIAL
INFORMATION  OF  VIDEO"  and the  Financial  Statements  of Video  and the notes
thereto included elsewhere in this Joint Proxy Statement/Prospectus.

                                                 (In thousands, except per share data)
<CAPTION>

                                                                                                    Nine Months Ended
                                                       Year Ended December 31,                        September 30,
                               --------------------------------------------------------------    ----------------------

                                    1991         1992         1993        1994        1995        1995          1996
                                   ------       ------       ------      ------      ------      ------         -----

<S>                              <C>          <C>          <C>          <C>          <C>          <C>         <C>    
Statement of Operations
Data:

Sales ........................   $  --        $   257      $   744      $ 4,241      $ 8,610      $ 7,768     $ 2,000

Cost of sales ................      --            188          564        3,440        7,343        5,899       3,085

Gross margin .................      --             69          180          801        1,267        1,869      (1,085)

Operating expenses ...........       231          663        1,048        1,549        3,046        1,951       1,867

Net income (loss) ............      (231)        (599)        (916)        (847)      (1,681)          12      (3,035)

Net income (loss) per 
share(1) .....................     (0.16)       (0.30)       (0.38)       (0.31)       (0.36)        0.00       (0.63)

Weighted average number
of shares outstanding(1) .....     1,400        2,012        2,388        2,748        4,674        5,208       4,809



Balance Sheet Data:
  (at end of period)

Working capital (deficit) ....   $  (142)     $  (195)     $(1,047)     $ 5,163      $ 2,760      $ 4,531     $    41
Total assets .................        45          294          491        6,342        6,615        7,562       5,251
Total shareholders' equity
(deficit) ....................      (120)        (123)        (959)       5,349        3,876        5,570       1,128

<FN>
- ----------------------------
See the notes to the Financial Statements included elsewhere herein.

(1)      Computed  on the  basis  described  in  Note 1 of  Notes  to  Financial
         Statements of Video.
</FN>
</TABLE>

- --------------------------------------------------------------------------------

                                       6
<PAGE>

- --------------------------------------------------------------------------------

<TABLE>

Knogo Historical Financial Information

         The  following  table  sets  forth  summary   historical   consolidated
financial  information of Knogo for the periods indicated which has been derived
from Knogo's audited and unaudited financial statements.  Unaudited interim data
as of September  30, 1995 and 1996 and for the nine months then ended  reflects,
in the opinion of Knogo's management, all adjustments (consisting only of normal
recurring  adjustments)  considered necessary for a fair presentation of results
for such interim  periods.  Results of operations for unaudited  interim periods
are not  necessarily  indicative  of results which may be expected for any other
interim or annual period. The summary historical financial information should be
read  in  conjunction  with  "KNOGO  MANAGEMENT'S  DISCUSSION  AND  ANALYSIS  OF
FINANCIAL CONDITION AND RESULTS OF OPERATIONS,"  "SELECTED  HISTORICAL FINANCIAL
INFORMATION OF KNOGO" and the Consolidated Financial Statements of Knogo and the
notes thereto included elsewhere in this Joint Proxy Statement/Prospectus.

<CAPTION>

                                              (In thousands, except for per share data)


                                             Year ended the last       Ten Months Ended    Year Ended           Nine Months Ended
                                               day of February           December 31,      December 31,           September 30,
                                        1992       1993       1994          1994              1995             1995           1996
                                       ------     ------     ------   ----------------- ----------------     --------       ------
<S>                                   <C>        <C>        <C>           <C>             <C>                 <C>         <C>     
Summary of Operations Data:

Sales of security devices and
 related interest income, service
 rentals and other .................. $ 24,242   $ 22,592   $ 18,243      $ 13,724        $ 17,361            $ 13,327    $ 14,190
Sales to affiliates/Sensormatic .....    9,734     10,072     11,375         6,957          12,043               9,062       3,990
                                      --------   --------   --------      --------        --------            --------    --------
Total revenues ......................   33,976     32,664     29,618        20,681          29,404              22,389      18,180
Cost of sales .......................   16,832     16,697     14,631        10,041          14,425              11,168       9,398
Customer service expenses ...........    4,046      3,969      3,984         3,353           3,235               2,621       2,197
Selling, general and                                                                                        
 administrative expenses ............   11,926      9,819      9,227         9,548           8,235               6,143       5,387
Income (loss) before income taxes ...     (738)     1,148        762        (2,858)          1,941               1,265       2,655**
Net income (loss) ...................   (1,057)       624        123        (2,833)          1,731               1,075       1,991
Net income per share ................        *          *          *             *            0.29                0.18        0.33
                                                                                                            
Selected Balance Sheet Data:                                                                                
(at end of period)                                                                                          
Total assets ........................ $ 36,193   $ 33,546   $ 34,583      $ 26,522        $ 29,338            $ 28,257    $ 30,485
Property, plant and equipment, net ..   13,753     13,092     12,830         9,842           9,081               9,222       8,950
Long term bank debt .................     --         --         --            --              --                  --          --
Obligations under capital leases ....     --          797        688           945             748                 763         587
Total shareholders' equity ..........   32,056     28,308     27,055        20,888          22,669              21,953      24,858

<FN>
See the  notes  to the  Consolidated  Financial  Statements  of  Knogo  included
elsewhere herein.

*        Historical  per share data for  earnings  and  dividends  have not been
         presented  for  periods  prior to the year ended  December  31, 1995 as
         Knogo was not a publicly-held company during these periods.

**       Includes gain on sale of assets of $2,462.
</FN>
</TABLE>

- --------------------------------------------------------------------------------

                                       7
<PAGE>

- --------------------------------------------------------------------------------

<TABLE>

Sentry Unaudited Pro Forma Combined Condensed Financial Information

         The  summary   unaudited  pro  forma   combined   condensed   financial
information  of Sentry has been derived from, or prepared on a basis  consistent
with, the unaudited pro forma combined condensed  financial  statements included
elsewhere in this Joint Proxy  Statement/Prospectus.  This data is presented for
illustrative  purposes  only and is not  necessarily  indicative of the combined
results of  operations  or financial  position  that would have  occurred if the
Merger had occurred at the  beginning  of each period  presented or on the dates
indicated,  nor is it necessarily  indicative of the future operating results or
financial position of Sentry.

<CAPTION>

                                                             (In thousands, except for per share data)

                                                              Year Ended          Nine Months Ended
                                                             December 31,           September 30,
                                                                 1995                   1996
                                                       ------------------------   ---------------
<S>                                                            <C>                     <C>    
Summary of Operations Data:
Total revenues......................................           $38,014                 $20,180
Cost of sales.......................................            25,003                  14,680
Selling, general and administrative expenses........            10,654                   6,918
Amortization of goodwill and other intangibles......             1,125                     844
Income (loss) before income taxes...................             (845)                 (1,209)
Net income (loss)...................................             (995)                 (1,305)
Net income (loss) available to common                         
shareholders........................................           (2,207)                 (2,254)
Net income (loss) per share.........................            (0.23)                  (0.24)
                                                              
Selected Balance Sheet Data:                                  
(at end of period)                                            
Total assets........................................                                   $43,512
Property, plant and equipment, net..................                                     9,220
Long term bank debt.................................                                        --
Obligations under capital leases....................                                       587
Total shareholders' equity..........................                                     7,102
                                                            
</TABLE>


- --------------------------------------------------------------------------------

                                       8
<PAGE>

- --------------------------------------------------------------------------------
   
<TABLE>

Comparative Per Share Data

         Set forth  below are  historical  net income  (loss)  per  share,  cash
dividends  per share  and book  value per  share  data of Video and  Knogo,  and
unaudited pro forma combined per share data of Sentry.  The data set forth below
should  be read in  conjunction  with the  Video  and  Knogo  audited  financial
statements  and  unaudited  interim  financial  statements,  including the notes
thereto, which are included elsewhere in this Joint Proxy  Statement/Prospectus.
The data  should  also be read in  conjunction  with  the  unaudited  pro  forma
combined condensed financial statements,  including the notes thereto,  included
elsewhere in this Joint Proxy Statement/Prospectus.

<CAPTION>

                                               Video                                        Knogo
                             -----------------------------------------    -----------------------------------------
                                 Nine Months          Year Ended or           Nine Months          Year Ended or
                                   Ended or           as of December            Ended or          as of December
                               as of September             31,              as of September             31,
                                   30, 1996                1995                   30,                   1995
                                                                                  1996
                             --------------------   ------------------    --------------------  -------------------
<S>                                <C>                   <C>                     <C>                   <C>  
Historical:
         Net Income (Loss)         $(0.63)               $(0.36)                 $0.33                 $0.29
         Per Share
         Cash Dividends Per          --                    --                     --                    --
         Share
         Book Value Per              0.24                  0.82                   4.31                 3.96
         Share


                                              Sentry
                             -----------------------------------------
                                 Nine Months          Year Ended or
                                   Ended or           as of December
                               as of September             31,
                                   30, 1996                1995
                             --------------------   ------------------
Pro Forma Combined (a):
         Net Income (Loss)         $(0.24)               $(0.23)
         Per Share
         Cash Dividends Per          --                    --
         Share

Pro Forma Equivalents (b):
         Net Income                $(0.20)               $(0.19)
         (Loss) Per Share
         Cash Dividends Per          --                    --
         Share
         Book Value Per              0.62                  N/A
         Share

<FN>
- ---------------------------

(a)      The unaudited pro forma combined condensed  statement of operations for
         the nine months ended  September  30, 1996 was prepared  based upon the
         statement of  operations of each of Video and Knogo for the nine months
         ended  September 30, 1996. The unaudited pro forma  combined  condensed
         statement  of  operations  for the year  ended  December  31,  1995 was
         prepared  based upon the  statements of operations of each of Video and
         Knogo for the year ended  December 31, 1995.  The  unaudited  pro forma
         combined  condensed  balance sheet was prepared  based upon the balance
         sheets of each of Video and Knogo as of September 30, 1996.


- --------------------------------------------------------------------------------

                                       9
<PAGE>

- --------------------------------------------------------------------------------

(b)      Sentry pro forma equivalents represent the unaudited pro forma combined
         net income (loss) per share,  cash dividends per share,  and book value
         per share calculated on the basis of a 1 to 1.2022 exchange ratio.

</FN>
</TABLE>
    

Comparative Market Prices and Dividends

         Video  Common Stock is listed on the NASDAQ  SmallCap  under the symbol
VSEN. Knogo's Common Stock is listed on the AMEX under the symbol KNA.

   
         On  October  10,  1996,  the last full  trading  day  preceding  public
announcement of the proposed Merger, the closing price per share of Video Common
Stock on the NASDAQ SmallCap was $4 3/8 and the closing price per share of Knogo
Common  Stock on the AMEX was $8 15/16.  On January  17,  1997,  the most recent
practicable date prior to the printing of this Joint Proxy Statement/Prospectus,
the closing  price  per share of  Video Common Stock on the NASDAQ  SmallCap was
$2 7/8 and the  closing  price per share of Knogo  Common  Stock on the AMEX was
$5 1/2. See "COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION."
    

         Holders  of Video  Common  Stock  and Knogo  Common  Stock are urged to
obtain  current market  quotations  prior to making any decision with respect to
the Merger.

         The  payment  of future  dividends  on Sentry  Common  Stock  will be a
business  decision to be made by the Board of  Directors  of Sentry (the "Sentry
Board") from time-to-time based upon the results of operations and the financial
condition  of Sentry  and such  other  factors  as the  Sentry  Board  considers
relevant.  Sentry has not paid, and does not presently intend to pay or consider
the payment of, any cash dividends on the Sentry Common Stock.  See "COMPARATIVE
PER SHARE MARKET PRICE AND DIVIDEND  INFORMATION."  Pursuant to the terms of the
Merger  Agreement,  Sentry is  required  to pay  certain  annual or  semi-annual
dividends  on the  Sentry  Class A  Preferred  Stock.  For the  first  two years
following the Merger,  Sentry shall pay such dividends by delivering  additional
shares of Sentry Class A Preferred  Stock.  See  "DESCRIPTION  OF SENTRY CAPITAL
STOCK -- Preferred Stock -- Class A Preferred Stock."

Listing of Sentry Common Stock and Sentry Class A Preferred Stock

   
         Sentry  expects  to apply for the  listing of Sentry  Common  Stock and
Sentry  Class A Preferred  Stock on the AMEX,  and it is  anticipated  that such
shares will trade on such exchange upon  official  notice of issuance  under the
symbols SKV and SKV.Pr.A, respectively. It is a condition to consummation of the
Merger that the shares of Sentry Common Stock and Sentry Class A Preferred Stock
to be issued to Video and Knogo shareholders,  as applicable, in connection with
the  Merger  shall have been  approved  for  listing  on  NASDAQ,  or a national
securities  exchange,  subject  only to official  notice of  issuance.  See "THE
MERGER -- Stock Exchange Listing."
    

- --------------------------------------------------------------------------------


                                       10
<PAGE>

            CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING STATEMENTS

         Certain statements  contained under "VIDEO MANAGEMENT'S  DISCUSSION AND
ANALYSIS  OF  FINANCIAL   CONDITION  AND  RESULTS  OF  OPERATIONS,"  and  "KNOGO
MANAGEMENT'S  DISCUSSION  AND  ANALYSIS OF  FINANCIAL  CONDITION  AND RESULTS OF
OPERATIONS," such as those relating to Video's anticipated reduction in material
and installation  costs on its new SentryVision  system and Knogo's  anticipated
replacement of sales to Sensormatic (as defined) under the Supply  Agreement (as
defined)  with  increased  sales  to third  parties,  certain  statements  under
"BUSINESS OF VIDEO" and "BUSINESS OF KNOGO",  such as those  relating to Video's
plans to increase  penetration of the domestic  retail market and to expand into
international  markets and Knogo's  anticipated  growth in the  supermarket  and
computer  industry  markets,  and other  statements  contained  herein regarding
matters that are not historical facts, are  forward-looking  statements (as such
term is defined in the Act).  Because such  forward-looking  statements  include
risks and  uncertainties,  actual  results  may  differ  materially  from  those
expressed  or implied by such  forward-looking  statements.  Factors  that could
cause actual results to differ materially include, but are not limited to, those
discussed under "RISK FACTORS."


                                  RISK FACTORS

   
         The  following  risk factors  should be  considered by holders of Video
Common Stock and Knogo Common Stock in evaluating  whether to approve the Merger
Agreement and thereby  become  holders of Sentry Common Stock and Sentry Class A
Preferred   Stock,  as  applicable.   These  factors  should  be  considered  in
conjunction with the other  information  included  elsewhere in this Joint Proxy
Statement/Prospectus.  In  evaluating  Video's,  Knogo's and Sentry's  business,
prospective  investors  should  carefully  consider  the  following  factors  in
addition   to  the   other   information   presented   in   this   Joint   Proxy
Statement/Prospectus.
    

Risks Relating to the Merger

   
Integration of Certain Operations
    

         The  managements  of Video  and  Knogo  have  entered  into the  Merger
Agreement  with the  expectation  that the  Merger  will  result  in  beneficial
synergies for Video and Knogo. See "THE MERGER -- Recommendation of Video Board;
Video's  Reasons  for the Merger"  and "THE  MERGER --  Recommendation  of Knogo
Board;  Knogo's Reasons for the Merger."  Achieving the anticipated  benefits of
the  Merger  will  depend  in  part  upon  whether  the  integration  of the two
companies'  businesses is accomplished in an efficient and effective manner, and
there can be no  assurance  that this will  occur.  The  combination  of the two
companies  will  require,  among other  things,  integration  of the  companies'
respective  product  offerings and technology and coordination of their research
and development,  sales and marketing and financial reporting efforts. There can
be  no  assurance  that  such  integration  will  be  accomplished  smoothly  or
successfully.  If significant difficulties are encountered in the integration of
the existing product lines and technology,  resources could be diverted from new
product  development,  resulting  in delays in new  product  introductions.  The
integration of the product lines could also cause  confusion or  dissatisfaction
among  existing   customers  of  Video  and  Knogo.  The  difficulties  of  such
integration  may be increased by the  necessity of  coordinating  geographically
separated  organizations  with distinct  cultures.  The  integration  of certain
operations  following the Merger will require the  dedication of management  and
other  personnel  resources which may  temporarily  distract  attention from the
day-to-day   business  of  Sentry.   Failure  to  successfully   accomplish  the
integration  of the two  companies'  operations  could have a  material  adverse
effect on Sentry's business, financial condition or results of operations.

   
Distributors, Resellers and Customers
    

         There can be no assurance that distributors, resellers and customers of
Video or Knogo will continue their current buying patterns without regard to the
announced Merger. In particular,  certain present and potential distributors and
customers  may defer  purchasing  decisions  as they  evaluate  Sentry's  future
product  strategy.  Any such deferrals  could have a material  adverse effect on
Sentry's business, financial condition or results of operations.


                                       11
<PAGE>

   
Fixed Exchange Ratio

         Under the terms of the Merger Agreement, each one share of Video Common
Stock issued and  outstanding  at the Effective  Time will be converted into the
right to receive  one share of Sentry  Common  Stock and each  1.2022  shares of
Knogo  Common  Stock  issued  and  outstanding  at the  Effective  Time  will be
converted  into the right to receive  one share of Sentry  Common  Stock and one
share of Sentry Class A Preferred Stock. Although the merger consideration to be
received by the holders of Video  Common  Stock and Knogo Common Stock was based
upon  the  trading  prices  of  Knogo  Common  Stock  and  Video  Common  Stock,
respectively,  at the time the Merger was negotiated,  the Merger Agreement does
not contain any provisions for adjustment of the merger  consideration  based on
fluctuations  in the  price  of  Knogo  Common  Stock  or  Video  Common  Stock.
Accordingly,  the value of the Sentry  Common Stock and Sentry Class A Preferred
Stock, as applicable,  to be received by the stockholders of Video and Knogo, as
the case may be, upon the Merger  could be affected by the market price of Video
Common  Stock and Knogo  Common  Stock at the  Effective  Time.  There can be no
assurance  that the market price of a share of Sentry  Common Stock on and after
the  Effective  Time will not be lower than the market price of a share of Video
Common Stock prior to the Effective  Time.  There also can be no assurance  that
the  combined  value of the market  price on and after the  Effective  Time of a
share of Sentry Common Stock and a share of Sentry Class A Preferred  Stock will
not be lower than the market  price of each 1.2022  outstanding  shares of Knogo
Common Stock prior to the Effective Time. On October 10, 1996, the date on which
the Merger was announced, the closing per share sale price of Knogo Common Stock
was $8 15/16.  On such date the  closing  per share sale  price of Video  Common
Stock was $4 3/8. On January 17, 1997, the most recent practicable date prior to
the  printing  of this Joint Proxy  Statement/Prospectus,  the closing per share
sale price of Knogo  Common Stock was $5 1/2. On such date the closing per share
sale price of Video Common  Stock was $2 7/8.  Holders of Video Common Stock and
Knogo Common Stock are urged to obtain current market quotations prior to making
a decision with respect to the Merger.
    

Listing of Sentry Common Stock and Sentry Class A Preferred Stock

         It is a condition  to the Merger that the Sentry  Common  Stock and the
Sentry  Class A Preferred  Stock be listed on NASDAQ,  or a national  securities
exchange.  There can be no  assurances  that  Knogo and Video will not waive the
listing of either or both of the  Sentry  Common  Stock and the  Sentry  Class A
Preferred  Stock, if such listing is not available.  If either such listing were
to be waived and the Merger consummated,  holders of Knogo Common Stock would be
entitled to appraisal  rights which they would not otherwise be entitled to. See
"THE MERGER -- Dissenters' Rights -- Knogo."

   
Transaction Charges
    
         Video  and  Knogo   anticipate  that  Sentry  will  incur   significant
Merger-related expenses including investment advisory fees, legal and accounting
expenses  and  other  transaction  costs.  These  costs  are  expected  to total
$2,350,000  and are expected to be capitalized as part of the purchase price and
amortized over a seven year period following the Merger.

Risks Relating to Sentry

Absence of Public Trading Market; Possible Volatility of Stock Price

         There is not  currently a public  trading  market for the Sentry Common
Stock or the Sentry Class A Preferred  Stock and there can be no assurance as to
the  establishment or continuity of any such market.  Sentry expects to apply to
have the Sentry  Common Stock and the Sentry Class A Preferred  Stock listed for
quotation  on  NASDAQ,  or a  national  securities  exchange.  There  can  be no
assurance  either as to the price at which trading in the Sentry Common Stock or
the Sentry  Class A  Preferred  Stock  will occur  after the Merger or that such
prices will not be below the book value per share of the Sentry  Common Stock or
the  Sentry  Class  A  Preferred  Stock,  as  applicable.  Future  announcements
concerning Sentry or its competitors,  quarterly variations in operating results
and announcements  concerning significant contracts,  among other factors, could
cause the market  price of the Sentry  Common  Stock  and/or the Sentry  Class A
Preferred Stock to fluctuate substantially.


                                       12
<PAGE>

No Cash Dividends

         Neither Video nor Knogo has paid  dividends on its common shares in the
past.  Sentry does not intend to consider  the payment of any cash  dividends on
the Sentry Common Stock or the Sentry Class A Preferred Stock in the foreseeable
future,  except as required by the Merger  Agreement  and  Sentry's  Amended and
Restated  Certificate of  Incorporation  and  Certificate of Designation for the
Sentry Class A Preferred  Stock (such  certificates,  collectively,  the "Sentry
Certificate  of  Incorporation").  See  "DESCRIPTION  OF SENTRY CAPITAL STOCK --
Preferred  Stock -- Class A  Preferred  Stock"  and  "RISK  FACTORS  --  Capital
Requirements."

Control by Existing Officers and Directors

   
         Upon completion of this Merger, the directors and executive officers of
Video in the  aggregate  will  beneficially  own shares of Sentry  Common  Stock
representing  approximately  12.4% of the voting  power of all of Sentry's  then
outstanding voting securities.  Because of such ownership,  the current officers
and  directors of Video may be able to  substantially  influence  the affairs of
Sentry,  including the election of the Sentry Board.  See "MANAGEMENT OF SENTRY"
and "SENTRY SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT."
    

         Immediately  following  the Merger,  directors and officers of Knogo in
the aggregate  will  beneficially  own shares of Sentry Common Stock,  including
shares  held by  William A.  Perlmuth,  as  Executor  of the Estate of Arthur J.
Minasy  and as  Trustee  under  trusts for the  benefit  of Mr.  Minasy's  adult
children,  representing  approximately  11.6%  of  the  voting  power  of all of
Sentry's then outstanding  voting  securities.  Mr. Perlmuth will be Chairman of
the Sentry Board upon consummation of the Merger. Because of such ownership, the
current officers and directors of Knogo may be able to  substantially  influence
the  affairs  of  Sentry,  including  the  election  of the  Sentry  Board.  See
"MANAGEMENT  OF SENTRY" and "SENTRY  SECURITY  OWNERSHIP  OF CERTAIN  BENEFICIAL
OWNERS AND MANAGEMENT."

Anti-Takeover Provisions

         Certain  provisions  of the Sentry  Certificate  of  Incorporation  and
Sentry Bylaws (the "Sentry Bylaws") may have the effect of making more difficult
an acquisition of control of Sentry in a transaction  not approved by the Sentry
Board.  See "DESCRIPTION OF SENTRY CAPITAL STOCK." These provisions will include
the ability of Sentry's Board to issue shares of preferred  stock in one or more
series and  additional  shares of  authorized  but unissued  Sentry Common Stock
without further authorization of Sentry stockholders. These provisions generally
are designed to permit Sentry to develop its businesses and foster its long-term
growth without the  disruption  caused by the threat of a takeover not deemed by
Sentry's Board to be in the best interests of Sentry and its stockholders. These
provisions may also have the effect of  discouraging a third party from making a
tender offer or  otherwise  attempting  to obtain  control of Sentry even though
such  a  transaction  might  be  economically   beneficial  to  Sentry  and  its
stockholders. See "DESCRIPTION OF SENTRY CAPITAL STOCK."

         Sentry  is  subject  to the  provisions  of  the  DGCL  which  includes
provisions  relating to "control share  acquisitions" and restricting  "business
combinations"  with  "interested  shareholders."  Such provisions could have the
effect of  discouraging  an attempt to acquire  control of Sentry.  Accordingly,
stockholders may be denied the opportunity to participate in a transaction which
offers a premium to the prevailing  market price of the Sentry Common Stock. See
"DESCRIPTION OF SENTRY CAPITAL STOCK."

Dependence on Significant Customers

         Although the composition of Video's largest  customers has changed from
year-to-year,  Video's  operations have been  materially  dependent on a limited
number of significant  orders. Five customers accounted for 83% of Video's sales
in 1993, two customers accounted for 81% of Video's sales in 1994, two customers
accounted for 79% of Video's sales in 1995, and two customers  accounted for 84%
of Video's  sales for the first nine months of 1996.  While  management  expects
Video's  customer base to continue to expand,  a limited  number of large orders
may continue to account for a  significant  portion of Video's  sales during any
given  period  for the  foreseeable  future.  As  such,  a delay,  reduction  or
cancellation of orders from one or more of its significant customers or the loss
of one or more of such customers may have a material  adverse effect on Sentry's
financial  condition  and  results  of  



                                       13
<PAGE>

operations and cash flows.  See "VIDEO  MANAGEMENT'S  DISCUSSION AND ANALYSIS OF
FINANCIAL  CONDITION  AND  RESULTS  OF  OPERATIONS"  and  "BUSINESS  OF VIDEO --
Customers."

Competition

         The  security,  theft  detection  and  surveillance  industry is highly
competitive.  Competing  products and  services to Video's  CCTV system  include
conventional fixed-mount or PTZ dome surveillance systems, EAS systems and other
magnetic  and  electronic  devices,  and  private  guard  services.  Many of the
foregoing  products and services provide theft detection and security at a price
which may be lower than the cost of Video's monitoring and surveillance systems.
Similarly,  competition  in the EAS industry is intense.  Potential  competitors
include  major  domestic and  international  EAS  companies,  many of which have
substantially greater financial, technical, marketing, sales and other resources
than  Knogo.  A number of the  companies  with which  Sentry will  compete  have
substantially greater financial,  sales and marketing, and other resources which
may enable  them to develop and market  competitive  surveillance  and  security
systems.  Although  management  believes  that  Sentry  will be able to  compete
effectively  based  on the  capabilities,  flexibility  and  performance  of its
products,  there can be no assurance that it will compete  successfully with its
future  competitors.  See  "BUSINESS OF VIDEO --  Competition"  and "BUSINESS OF
KNOGO -- Competition."

Knogo Non-Competition Agreement

         When  Knogo  was  spun  off  from  its  corporate  predecessor,   Knogo
Corporation  (the "Knogo  Predecessor"),  Knogo entered into a Contribution  and
Divestiture  Agreement (the "Divestiture  Agreement"),  dated as of December 29,
1994  (the  "Divestiture  Date").  Pursuant  to the  terms  of  the  Divestiture
Agreement, Knogo is subject until the fifth anniversary of the Divestiture Date,
December  29,  1999,  to a  non-competition  clause with  respect to engaging in
certain business activities outside of the United States, Puerto Rico and Canada
(the  "Territory"),  which may limit Sentry's ability to expand Knogo's existing
business outside the Territory.

         Under the non-competition clause, Sentry will not be permitted, outside
of the  Territory,  to market,  distribute,  sell,  lease,  install,  service or
maintain any Knogo electronic article surveillance  systems,  including reusable
tags,  disposable  labels and accessory  products  used in such systems,  closed
circuit television systems and products,  and other products to deter and detect
shoplifting  and employee  theft,  or  improvements  or  successors  to any such
product,  but in each case only to the extent that the products  were  marketed,
sold or leased by the Knogo  Predecessor  prior to the  Divestiture  Date  (such
products, the "Existing Products"). In addition, Sentry may not otherwise engage
in the  business  of,  or  activities  relating  to,  manufacturing,  marketing,
distributing,  selling, leasing, servicing or maintaining or licensing of any of
the  Existing  Products  outside of the  Territory.  See  "BUSINESS  OF KNOGO --
Production" and "BUSINESS OF KNOGO -- Competition." The managements of Video and
Knogo  believe that the  above-described  non-competition  clause will not, upon
consummation of the Merger, limit the ability of Sentry to market Video products
in any market, geographic or otherwise.

History of  Operating  Losses;  Risk of  Significant  Fluctuations  in Operating
Results

         Video incurred  operating  losses in each of the years 1993,  1994, and
1995 and had an  accumulated  deficit of  $6,753,588  as of September  30, 1996.
Moreover,  Video's quarterly operating results have varied and Sentry's may vary
significantly  depending  on factors such as the timing of  significant  orders,
seasonality in the retail market,  potential  rescheduling  or  cancellation  of
orders,   research  and  development   expenses   associated  with  new  product
introductions,  and the timing of new  product  introductions  and  upgrades  by
Sentry and its  competitors.  Revenues may be particularly  difficult to predict
because of the sales cycle of Video's products,  which varies substantially from
customer to customer and market to market. In addition, a significant portion of
Sentry's sales in any given period may be derived from a relatively small number
of orders,  and a change,  delay or  cancellation  in any order could  result in
large fluctuations in sales for that quarter.  Further,  delivery lead times for
Video's  systems are  relatively  short.  The  resulting  lack of a  significant
backlog  may  contribute  to  the   unpredictability   of  Sentry's  results  of
operations.  Video's  expense  levels  have  historically  been based in part on
expectations  of future sales levels,  and a shortfall in sales could  therefore
result in a disproportionate decrease in Sentry's net income. These factors also
could significantly affect annual results of operations. See "VIDEO MANAGEMENT'S
DISCUSSION AND ANALYSIS OF FINANCIAL  CONDITION AND RESULTS OF  OPERATIONS"  and
"BUSINESS OF VIDEO -- Sales, Marketing and Customer Service."

                                       14
<PAGE>

         The Statement of  Operations  of Knogo for the year ended  December 31,
1995 and the nine months ended  September  30, 1996  included  elsewhere in this
Joint Proxy Statement/Prospectus reflect that Knogo had net income of $1,731,000
and  $1,991,000,  respectively,  for such periods.  Sentry's  ability to realize
earnings  in the  future  will  depend  in  large  part on the  availability  of
opportunities to expand Knogo's customer base, especially in the supermarket and
other sectors which have not  historically  utilized EAS technology,  to improve
existing  products  and to exploit  source  tagging  technology,  as to which no
assurances  can be given.  See "KNOGO  MANAGEMENT'S  DISCUSSION  AND ANALYSIS OF
FINANCIAL  CONDITION  AND  RESULTS  OF  OPERATIONS"  and  "BUSINESS  OF KNOGO --
Marketing." In addition, see "RISK FACTORS -- Knogo Lost Manufacturing and Sales
Volume" for risks associated with the termination of a supply agreement  between
Knogo and Sensormatic Electronics Corporation  ("Sensormatic") (with Sensormatic
as successor to the Knogo Predecessor).

Product Concentration; Market Acceptance

         Although Video has taken steps to broaden its product offerings,  sales
of SentryVision  systems and related  products and  enhancements are expected to
continue  to  account  for a  substantial  portion  of  Video's  sales  for  the
foreseeable  future. Use of the SentryVision system represents an alternative to
conventional surveillance methods, and future growth will depend upon acceptance
of Video's  traveling  CCTV system by a broader group of  customers.  Failure to
achieve  broader  acceptance  would have a material  adverse  effect on Sentry's
financial  condition  and  results  of  operations.  In  addition,  any  factors
adversely  affecting Video's  SentryVision  system,  such as the introduction of
superior competitive  products or shifts in the needs of the marketplace,  would
have a material  adverse effect on Sentry's  financial  condition and results of
operations. See "BUSINESS OF VIDEO."

Dependence on Proprietary Technology

         Video currently holds a United States patent covering  certain features
of its traveling camera  surveillance  system and has applied for  corresponding
foreign  patents.  Sentry  may also seek  patent  protection  in the  future for
certain aspects of any new systems or features which may be developed. There can
be no assurance that any future patent  applications filed by Sentry will result
in issued patents,  or that the patent currently held or new patents, if issued,
will be upheld as valid or will provide any significant competitive advantage to
Sentry. Further, if it were determined that another product infringed on Video's
patent,  there can be no assurance that Sentry would be  financially  capable of
enforcing its patent. Although Video is not aware of any infringement of patents
or intellectual  property held by third parties,  there can be no assurance that
Video is not  infringing  on the  intellectual  property  rights of  others.  In
addition, there was an Australian patent covering a device that in some respects
is similar to the  SentryVision  system.  Based upon a review of the  Australian
patent,  management  believes  that many of the claims in such  patent  would be
found  invalid in view of prior art and that the current  products sold by Video
do not infringe on any valid claims of this patent. There also was an Australian
patent  application  covering a device  that in some  respects is similar to the
SentryVision  system.  Video's  patent  attorneys  have  advised  Video that the
Australian patent and Australian patent application appear to have lapsed. Video
is also aware of a British  patent  application  from a third  party  disclosing
aspects of a device  which is in some  respects  similar to the system.  Video's
patent attorneys have advised Video that the British patent application  appears
to have lapsed.  Although there can be no assurance as to the  effectiveness  of
such measures, Sentry intends to protect its current and future products through
all legal means available, including patents, the registration of trademarks and
trade names, copyrights and confidentiality  agreements.  See "BUSINESS OF VIDEO
- -- Patents and Intellectual Property."

         Knogo has certain proprietary  technologies for which patents have been
obtained or applied.  No assurance can be given that such patent  protection can
be  obtained  for all such  technologies  or, if  obtained,  that it will not be
challenged, invalidated or circumvented, that competitors will not independently
develop or patent technologies that are substantially  equivalent to or superior
to Knogo's technologies or that any of Knogo's developmental technologies can be
successfully commercialized.

         Knogo has entered into a License  Agreement (the "License  Agreement"),
dated as of December  29,  1994,  pursuant to which Knogo and  Sensormatic  have
granted to each other  certain  perpetual  fully-paid  licenses  to use  certain
patents and technology,  including  improvements thereof. See "BUSINESS OF KNOGO
- -- Patents and Other Intellectual Property."


                                       15
<PAGE>

Dependence on Key Personnel

         Video's and Knogo's operations have been materially  dependent upon the
services  of  certain  key  executive  officers,  the loss of whom  could have a
material  adverse effect on Sentry.  Although Knogo has entered into  employment
contracts  with its three most senior  executive  officers and Video has entered
into a non-compete  contract with its president,  there can be no assurance that
Sentry will be able to retain or replace  the members of its current  management
or  that  it  will  successfully   attract  and  retain  qualified   management,
engineering and sales personnel in the future. See "MANAGEMENT OF SENTRY."

Limitations on Director Liability

         Sentry's Certificate of Incorporation will provide, as permitted by the
DGCL, that a director of Sentry shall not be personally  liable to Sentry or its
stockholders  for monetary  damages for breach of fiduciary  duty as a director,
with certain  exceptions.  These  provisions  may discourage  stockholders  from
bringing suit against a director for breach of fiduciary duty and may reduce the
likelihood of derivative  litigation brought by stockholders on behalf of Sentry
against a director.  In addition,  Sentry's  Bylaws will  provide for  mandatory
indemnification of directors and officers to the fullest extent permitted by the
DGCL.

Capital Requirements

         Video's  cash flow  from  operations  and its  ability  to obtain  debt
financing,  are expected to meet Video's capital  requirements  through at least
1997.  However,  if  sales  and  marketing,   distribution,   and  research  and
development  efforts require more capital than anticipated,  or if cash received
from  operations  should be less  than  anticipated,  Video may need  additional
capital in order to maintain its product  development and marketing  efforts and
expected  levels of  operations.  Knogo's  internal  forecasts  and  assumptions
relating to its future  operations  anticipate  that Knogo will have  sufficient
cash  from  operations  to meet its cash  flow  needs  for at least  the next 12
months,  including through the availability of Knogo's $5,000,000 unsecured bank
credit  facility or any  successor  facility.  Moreover,  Knogo has  substantial
unencumbered assets,  including property in Cidra, Puerto Rico,  Hauppauge,  New
York,  and Villa Park,  Illinois,  upon which to base  additional  financing  if
required.  In that regard,  in December 1996,  Knogo completed a  sale-leaseback
arrangement with respect to its Hauppauge,  New York facility,  resulting in the
receipt by Knogo of net proceeds of  approximately  $4,500,000.  In  discussions
with Knogo's lender under its present credit facility, such lender has indicated
orally to Knogo's management that it is willing to enter into a revolving credit
facility with Sentry upon  completion of the Merger in an amount no less than is
currently provided to Knogo.

   
         There can be no assurance that continued funding,  through  borrowings,
equity  issuances or  otherwise,  if required by Sentry will be available or, if
available,  will be on terms favorable to Sentry. In addition, if Sentry were to
incur substantial  additional  indebtedness,  its ability to respond to changing
financial,  business and economic  conditions  could be adversely  affected.  In
addition,  pursuant to the terms of the Merger Agreement,  Sentry is required to
pay certain  dividends on the Sentry Class A Preferred  Stock.  Although for the
first  two  years  following  the  Merger,  Sentry  will pay such  dividends  by
delivering  additional  shares of Sentry Class A Preferred Stock, such dividends
may ultimately  adversely  impact Sentry's cash flow. See "DESCRIPTION OF SENTRY
CAPITAL  STOCK  --  Preferred   Stock  --  Class  A  Preferred   Stock,"  "VIDEO
MANAGEMENT'S  DISCUSSION  AND  ANALYSIS OF  FINANCIAL  CONDITION  AND RESULTS OF
OPERATIONS  --  Liquidity  and  Capital   Resources"  and  "KNOGO   MANAGEMENT'S
DISCUSSION  AND ANALYSIS OF FINANCIAL  CONDITION  AND RESULTS OF  OPERATIONS  --
Liquidity and Capital Resources."
    

Acquired In-Process Research and Development

         Sentry  expects  to spend up to 2% of its  future  revenues  to develop
commercially  viable products from acquired  in-process research and development
and intends to expend such amounts out of its cash flows from operations. Sentry
believes that it will be able to develop such commercially  viable products over
the next four years.  There can be no assurances,  however,  that Sentry will be
able to develop such  products  and/or  generate  sufficient  revenues from such
products to offset such  expenditures  of future  revenues or the  write-off  of
non-recurring  charges  of  approximately  $13.2  million  associated  with such
acquired in-process research and development.


                                       16
<PAGE>

Availability of Components

         While Video believes that the parts and manufactured  components needed
for the assembly of its products can be produced by and obtained  from  multiple
sources,  Video currently purchases parts and materials from a limited number of
suppliers.  In addition,  while Knogo has not historically been dependent on any
one supplier or group of suppliers of components  for its systems,  there can be
no assurance  that it will not become so dependent in the future.  The inability
to obtain such  components  on a timely  basis  would have an adverse  effect on
either Video's or Knogo's  ability,  as  applicable,  to fill orders in a timely
manner.  Any resulting  delay in the fulfillment of orders could have a material
adverse impact on Sentry's  financial  condition and results of operations.  See
"BUSINESS OF VIDEO  -- Manufacturing and Installation" and "BUSINESS OF KNOGO --
Production."

Business Plan

         As  part  of its  business  strategy,  Video  is  currently  evaluating
distribution  channels  to  facilitate  sales of its  products  internationally.
Future sales of Sentry's systems and products to customers outside of the United
States  may expose  Sentry to a number of risks  inherent  in the  international
marketplace.  Such  risks  include  unpredictable  and  inconsistent  regulatory
requirements, political and economic instability, trade restrictions, changes in
tariffs and taxes, longer payment cycles,  difficulties enforcing agreements and
collecting  receivables,  exchange  rate  fluctuations,  difficulties  enforcing
intellectual property rights and compliance with foreign technical standards.

         Knogo's present  business plan assumes that Knogo's EAS business in all
its  product  lines  should  expand  as a result  of the sole  focus of  Knogo's
management  on  the  North  American  business  of  the  Knogo  Predecessor.  In
particular,  Knogo's plan assumes continued  expansion in the use of EAS systems
in the supermarket  sector,  a relatively  untapped market among retail users of
loss  prevention  devices,  which  sector  Knogo  believes  offers  considerable
potential, and in the commercial and industrial sector, including the protection
of high value  components  in the computer  industry.  See "BUSINESS OF KNOGO --
Marketing."  However,  any anticipated  growth in these areas is prospective and
there is a risk that  market  acceptance  of EAS  products  will not  develop as
expected.  Consequently,  there can be no  assurance  that any such  growth will
occur or that if it does occur that it will be sustained.

Knogo  Lost  Manufacturing  and Sales  Volume Due To  Termination  of the Supply
Agreement

         Knogo generates a significant  portion (41% in 1995 and 22% in the nine
months ended  September 30, 1996) of its revenues from production of EAS systems
and  products  for sale to  Sensormatic  pursuant to the Supply  Agreement.  The
Supply  Agreement  is  scheduled  to  expire on June 30,  1997.  There can be no
assurance that Knogo will be able to renew the terms of the Supply  Agreement or
to  otherwise  succeed  in  expanding  its sales  sufficiently  to  replace  the
manufacturing  and sales volume it will lose upon the  expiration  of the Supply
Agreement.  Consequently,  Knogo  may  have  difficulty  maintaining  profitable
margins in its manufacturing operations.  See "BUSINESS OF KNOGO -- Production,"
"BUSINESS  OF KNOGO --  Competition"  and  "KNOGO  MANAGEMENT'S  DISCUSSION  AND
ANALYSIS OF FINANCIAL  CONDITION  AND RESULTS OF  OPERATIONS  --  Liquidity  and
Capital Resources."

Employment Contracts

         The current  employment  agreements  of Thomas A.  Nicolette,  Peter J.
Mundy and Peter Y. Zhou, each of whom are executive  officers of Knogo,  provide
that  in the  event  of a  Change  in  Control  (as  defined  in the  respective
employment  agreement)  of  Knogo,  the  term of  employment  for  each of these
officers will be  automatically  extended for the period ending two years in the
case of Mr.  Nicolette's  agreement  and  one  year  in the  case  of the  other
agreements  following the date of such Change in Control.  Following such Change
in Control,  each such officer will have the right to terminate  his  employment
for Good  Reason  (as  defined in the  respective  employment  agreement)  while
continuing to receive the salary and bonus otherwise payable  thereunder for the
remainder  of the  employment  term.  Additionally,  the  employment  agreements
provide  that in the event of a Change in Control all options  held by each such
officer,  whether or not then  vested,  would fully vest.  The Knogo Merger will
constitute  a  Change  in  Control  for  purposes  of each of  these  employment
agreements.  See "BUSINESS OF KNOGO -- Executive Compensation -- Knogo Executive
Employment Agreements; Change in Control Arrangements." However, each of Messrs.
Nicolette and Mundy and Dr. Zhou has advised Knogo that he intends to enter,  as
of the  Effective  Time,  into a new  employment  agreement  with Sentry and, in
connection therewith,  to waive his rights under his Knogo 



                                       17
<PAGE>

employment  agreement.  Nonetheless,  it is anticipated  that the new employment
agreements for each such officer, as well as an employment agreement that Andrew
L. Benson is expected to enter into with Sentry,  will contain similar change in
control  provisions.  Any such  provisions may have the effect of discouraging a
third party from making a tender offer or otherwise attempting to obtain control
of Sentry even though such a  transaction  might be  economically  beneficial to
Sentry and its stockholders.  See "THE MERGER -- Interests of Certain Persons in
the Merger -- Employment Agreements."

Regulation

         Because Knogo's EAS systems and Video's  surveillance  and CCTV systems
use radio  transmission and  electromagnetic  wave principles,  such systems are
subject to regulation by the Federal Communications Commission ("FCC") under the
Communications  Act of 1934.  In  those  instances  where it has been  required,
certification of such products by the FCC has been obtained. As new products are
developed by Knogo,  application  will be made to the FCC for  certification  or
licensing when required.  No assurance can be given that such  certification  or
licensing will be obtained or that current rules and regulations of the FCC will
not be changed in an adverse manner. See "BUSINESS OF KNOGO -- Regulation."

         Sentry's  business plan calls for the sale and use of Sentry's products
in both domestic and international markets. Sentry's products will be subject to
regulation by governmental  authorities in various countries having jurisdiction
over electronic and communication use. Sentry intends to apply for certification
of its products to comply with the  requirements  under the  regulations  of the
countries in which it plans to market its  products.  No assurance  can be given
that such  certification  will be obtained or that current rules and regulations
in such countries will not be changed in a manner adverse to Sentry.


                                       18
<PAGE>

                              THE SPECIAL MEETINGS


         This Joint Proxy  Statement/Prospectus  is furnished in connection with
the  solicitation  of proxies (i) from the holders of Video  Common Stock by the
Video  Board for use at the Video  Meeting  and (ii) from the  holders  of Knogo
Common Stock by the Knogo Board for use at the Knogo Meeting.

Times and Places; Purposes

   
         Video.  The Video  Meeting  will be held at the  offices of  Winthrop &
Weinstine,  3000  Dain  Bosworth  Plaza,  60 South  Sixth  Street,  Minneapolis,
Minnesota, on February 6, 1997,  starting at 10:00 a.m. local time. At the Video
Meeting,  the  shareholders of Video will be asked to consider and vote upon the
Video  Proposal  and such other  matters as may  properly  come before the Video
Meeting.  A copy of the Merger Agreement is included as Appendix A to this Joint
Proxy Statement/Prospectus.

         Knogo.   The  Knogo   Meeting   will  be  held  at  Knogo's   corporate
headquarters,  350 Wireless Boulevard, Hauppauge, New York, on February 6, 1997,
starting at 11:00 a.m. local time. At the Knogo  Meeting,  the  stockholders  of
Knogo will be asked to consider and vote upon the Knogo  Proposal and such other
matters as may  properly  come  before the Knogo  Meeting.  A copy of the Merger
Agreement is included as Appendix A to this Joint Proxy Statement/Prospectus.

    

Voting Rights; Votes Required for Approval

         Video. The Video Board has fixed the close of business,  New York Time,
on January 10, 1997, as the Video Record Date.  Only holders of record of shares
of Video  Common Stock on the Video Record Date are entitled to notice of and to
vote at the Video Meeting. On the Video Record Date, there were 4,841,962 shares
of Video Common Stock outstanding and entitled to vote at the Video Meeting held
by approximately 63 shareholders of record.

         Each holder of record,  as of the Video  Record  Date,  of Video Common
Stock is  entitled  to cast one vote per share.  The  presence,  in person or by
proxy,  of the holders of a majority of the  outstanding  shares of Video Common
Stock entitled to vote is necessary to constitute a quorum at the Video Meeting.

         Under Video's  Bylaws and the Minnesota Act, the  affirmative  vote, in
person or by proxy,  of the holders of a majority of the shares of Video  Common
Stock  outstanding on the Video Record Date is required to approve and adopt the
Video Proposal.

   
         As of the Video Record Date,  directors and executive officers of Video
as a group  beneficially  owned  1,226,575  shares  of Video  Common  Stock,  or
approximately 24.2% of the Video Common Stock as of the Video Record Date. Video
has been advised that all of its directors and executive officers intend to vote
all such shares in favor of the Video Proposal. In connection with the execution
of the Merger Agreement,  certain Video shareholders entered into Support/Voting
Agreements, each dated October 10, 1996 (the "Video Support/Voting Agreements"),
with Knogo,  pursuant to which the shareholders promised to vote their shares of
Video Common Stock in favor of the Merger and the Merger  Agreement at the Video
Meeting.  Pursuant to a Video  Support/Voting  Agreement,  Robert D. Furst,  Jr.
agreed to vote his shares of Video Common Stock,  which account for 16.6% of the
outstanding  shares of Video Common  Stock.  Pursuant to a Video  Support/Voting
Agreement,  Andrew L. Benson  agreed to vote his shares of Video  Common  Stock,
which account for 4.0% of the outstanding shares of Video Common Stock.

         Knogo. The Knogo Board has fixed the close of business,  New York Time,
on January 10, 1997, as the Knogo Record Date.  Only holders of record of shares
of Knogo  Common Stock on the Knogo Record Date are entitled to notice of and to
vote at the Knogo Meeting. On the Knogo Record Date, there were 5,772,632 shares
of Knogo Common Stock outstanding and entitled to vote at the Knogo Meeting held
by approximately 504 stockholders of record.
    

                                       19
<PAGE>

         Each holder of record,  as of the Knogo  Record  Date,  of Knogo Common
Stock is  entitled  to cast one vote per share.  The  presence,  in person or by
proxy,  of the holders of a majority of the  outstanding  shares of Knogo Common
Stock entitled to vote is necessary to constitute a quorum at the Knogo Meeting.

         Under Knogo's Bylaws and the DGCL, the  affirmative  vote, in person or
by proxy,  of the  holders of a majority  of the  shares of Knogo  Common  Stock
outstanding  on the Knogo Record Date and entitled to vote on the Knogo Proposal
is required to approve and adopt the Knogo Proposal.

   
         As of the Knogo Record Date,  directors and executive officers of Knogo
as a group  beneficially  owned  1,392,344  shares  of Knogo  Common  Stock,  or
approximately 23.5% of the Knogo Common Stock as of the Knogo Record Date. Knogo
has been advised that all of its directors and executive officers intend to vote
all such shares in favor of the Knogo Proposal. In connection with the execution
of the Merger Agreement,  certain Knogo stockholders entered into Support/Voting
Agreements,   each  dated  or  dated  as  of  October   10,   1996  (the  "Knogo
Support/Voting  Agreements"),  with Video,  pursuant to which such  stockholders
agreed to vote their shares of Knogo Common Stock in favor of the Merger and the
Merger  Agreement  at the  Knogo  Meeting.  Pursuant  to a Knogo  Support/Voting
Agreement,  William A.  Perlmuth,  as executor of the Estate of Arthur J. Minasy
(the "Minasy Estate"), agreed to vote the Minasy Estate's shares of Knogo Common
Stock,  which account for 15.6% of the outstanding shares of Knogo Common Stock.
Pursuant to a Knogo  Support/Voting  Agreement,  Walter J.  Schloss and Edwin W.
Schloss,  each  acting  for the  general  partner  of  Walter  &  Edwin  Schloss
Associates  L.P.  ("Associates"),  agreed  to vote  Associates'  shares of Knogo
Common Stock,  which account for 11.1% of the outstanding shares of Knogo Common
Stock. Pursuant to a Knogo Support/Voting Agreement,  Thomas A. Nicolette agreed
to vote  his  shares  of  Knogo  Common  Stock,  which  account  for 2.4% of the
outstanding shares of Knogo Common Stock.
    

Proxies

         Video.  All  shares  of Video  Common  Stock  represented  by  properly
executed proxies received prior to or at the Video Meeting and not revoked, will
be voted in accordance with the  instructions  indicated in such proxies.  If no
instructions  are indicated on a properly  executed  returned proxy,  such proxy
will be voted  "FOR"  the Video  Proposal.  A  properly  executed  proxy  marked
"ABSTAIN,"  although  counted for  purposes of  determining  whether  there is a
quorum, will not be voted. Accordingly, since the affirmative vote of a majority
of the shares of Video  Common  Stock  outstanding  on the Video  Record Date is
required for approval of the Video Proposal,  a proxy marked "ABSTAIN" will have
the effect of a vote  against  the Video  Proposal.  In  accordance  with NASDAQ
rules,   brokers  and  nominees  are  precluded  from  exercising  their  voting
discretion on the Video Proposal and thus, absent specific instructions from the
beneficial  owner of such  shares,  are not  empowered  to vote such shares with
respect to the Video  Proposal.  Therefore,  because the  affirmative  vote of a
majority of the shares of Video  Common  Stock  outstanding  on the Video Record
Date is required  for approval of the Video  Proposal,  a broker  non-vote  with
respect to the Video  Proposal  will have the effect of a vote against the Video
Proposal.  Shares represented by broker non-votes (i.e.,  shares held by brokers
or nominees  which are  represented  at a meeting but with  respect to which the
broker or nominee  is not  empowered  to vote on a  particular  proposal)  will,
however, be counted for purposes of determining whether there is a quorum at the
Video Meeting.

         Knogo.  All  shares  of Knogo  Common  Stock  represented  by  properly
executed proxies received prior to or at the Knogo Meeting and not revoked, will
be voted in accordance with the  instructions  indicated in such proxies.  If no
instructions  are indicated on a properly  executed  returned proxy,  such proxy
will be voted  "FOR"  the Knogo  Proposal.  A  properly  executed  proxy  marked
"ABSTAIN,"  although  counted for  purposes of  determining  whether  there is a
quorum, will not be voted. Accordingly, since the affirmative vote of a majority
of the shares of Knogo  Common  Stock  outstanding  on the Knogo  Record Date is
required for approval of the Knogo Proposal,  a proxy marked "ABSTAIN" will have
the effect of a vote against the Knogo  Proposal.  In  accordance  with the AMEX
rules,   brokers  and  nominees  are  precluded  from  exercising  their  voting
discretion on the Knogo Proposal and thus, absent specific instructions from the
beneficial  owner of such shares,  are not  empowered to vote such shares on the
Knogo Proposal.  Therefore,  because the  affirmative  vote of a majority of the
shares of Knogo  Common Stock  outstanding  on the Knogo Record Date is required
for approval of the Knogo Proposal,  a broker non-vote with respect to the Knogo
Proposal  will have the  effect of a vote  against  the Knogo  Proposal.  Shares
represented  by broker  non-votes  will,  however,  be counted  for  purposes of
determining whether there is a quorum at the Knogo Meeting.

                                       20
<PAGE>

         If the  stockholder  is a  participant  in Knogo's  Retirement  Savings
401(k)  Plan,  then  such  stockholder's  proxy  will  also  serve  as a  voting
instruction for the trustees of the plan for all accounts registered in the same
name.

         It is not  expected  that any matter  not  referred  to herein  will be
presented for action at the Video Meeting or the Knogo Meeting, respectively. If
any other  matters are properly  brought  before the Video  Meeting or the Knogo
Meeting,  the persons named in the proxies will have  discretion to vote on such
matters in accordance  with their best judgment.  The grant of a proxy will also
confer  discretionary  authority  on the  persons  named  in the  proxy as proxy
appointees to vote in accordance with their best judgment on matters incident to
the conduct of the Special Meetings.

         General.  A shareholder  of Video or a stockholder  of Knogo may revoke
his or her proxy at any time prior to its use by  delivering to the Secretary of
Video or Knogo,  as the case may be, a signed  notice of  revocation  or a later
dated signed proxy or by attending  the Video Meeting or the Knogo  Meeting,  as
the case may be, and voting in person.  Attendance  at the Video  Meeting or the
Knogo Meeting will not in itself constitute the revocation of a proxy.

         The cost of solicitation of proxies will be paid by Video for the Video
proxies and by Knogo for the Knogo proxies. In addition to solicitation by mail,
proxies may be solicited in person by directors, officers and employees of Video
or Knogo, as the case may be, without additional compensation, and by telephone,
telegram,  teletype, facsimile or similar method. Arrangements will be made with
brokerage  houses and other  custodians,  nominees and fiduciaries to send proxy
material to  beneficial  owners;  and Video or Knogo,  as the case may be, will,
upon request,  reimburse them for their reasonable  expenses in so doing.  Knogo
has retained Georgesen and Company Inc. to aid in the solicitation of proxies at
a fee of approximately $6,500 plus expenses. To the extent necessary in order to
ensure  sufficient  representation  at the Video  Meeting or the Knogo  Meeting,
Video or Knogo,  as the case may be, may request by  telephone  or telegram  the
return of proxies.  The extent to which this will be necessary  depends entirely
upon how promptly proxies are returned.  Stockholders are urged to send in their
proxies without delay.

         HOLDERS OF VIDEO  COMMON  STOCK AND KNOGO  COMMON STOCK SHOULD NOT SEND
ANY CERTIFICATES REPRESENTING SUCH COMMON STOCK WITH THE ENCLOSED PROXY CARD. IF
THE MERGER IS APPROVED,  INSTRUCTIONS AND A LETTER OF TRANSMITTAL WILL BE MAILED
AFTER THE EFFECTIVE  TIME TO EACH PERSON WHO WAS A HOLDER OF  OUTSTANDING  VIDEO
COMMON STOCK AND/OR KNOGO COMMON STOCK  IMMEDIATELY PRIOR TO THE EFFECTIVE TIME.
VIDEO SHAREHOLDERS AND KNOGO STOCKHOLDERS SHOULD SEND CERTIFICATES  REPRESENTING
VIDEO COMMON STOCK AND KNOGO COMMON  STOCK,  AS THE CASE MAY BE, TO THE EXCHANGE
AGENT ONLY AFTER THEY RECEIVE,  AND IN ACCORDANCE  WITH,  THE  INSTRUCTIONS  AND
LETTER OF TRANSMITTAL.


                                       21
<PAGE>

                                   THE MERGER

Certain Effects of the Merger Upon Video

         Upon  consummation  of the Video Merger (the "Video  Effective  Time"),
Video Merger Corp.  will merge with and into Video and in the process Video will
become a wholly-owned subsidiary of Sentry. The name of the surviving subsidiary
will be Video Sentry Corporation.

         At the Video  Effective Time, by virtue of the Video Merger and without
any further  action,  each share of Video Common  Stock  issued and  outstanding
immediately  prior to the Video Effective Time shall be converted into and shall
represent the right to receive one share of Sentry  Common Stock.  All shares of
Video Common Stock shall no longer be  outstanding  and shall  automatically  be
canceled and extinguished and each certificate  which  immediately  prior to the
Video Effective Time evidenced any shares of Video Common Stock shall thereafter
represent the right to receive (without interest), upon surrender (in accordance
with the terms of the Merger  Agreement) of such  certificate,  shares of Sentry
Common Stock. In addition,  at the Video Effective Time, each share of any class
of stock held in Video's treasury shall also be canceled and retired.

Certain Effects of the Merger Upon Knogo

         Upon  consummation  of the Knogo Merger (the "Knogo  Effective  Time"),
Knogo Merger Corp.  will merge with and into Knogo and in the process Knogo will
become a wholly-owned subsidiary of Sentry. The name of the surviving subsidiary
will be Knogo North America Inc.

         At the Knogo  Effective Time, by virtue of the Knogo Merger and without
any  further  action,  each  1.2022  shares of Knogo  Common  Stock  issued  and
outstanding  immediately  prior to the Knogo  Effective  Time shall be converted
into and shall  represent  the right to receive one share of Sentry Common Stock
plus one share of Sentry  Class A Preferred  Stock.  All shares of Knogo  Common
Stock shall no longer be  outstanding  and shall  automatically  be canceled and
extinguished and each certificate which immediately prior to the Knogo Effective
Time evidenced any shares of Knogo Common Stock shall  thereafter  represent the
right to receive  (without  interest),  upon surrender (in  accordance  with the
terms of the Merger  Agreement)  of such  certificate,  shares of Sentry  Common
Stock and Sentry Class A Preferred  Stock in accordance with the ratio described
above.  In addition,  at the Knogo  Effective  Time,  each share of any class of
stock held in Knogo's treasury shall also be canceled and retired.

Background

         Between  1993  and  1995,  the  managements  of  Knogo  (or  the  Knogo
Predecessor,  as the case may be) and  Video  met  informally  several  times to
explore mutual business  opportunities,  relating,  among other things, to joint
product  distribution,  installation  and marketing  arrangements.  However,  no
definitive  agreements were entered into as a result of these meetings. In early
May 1996,  Alex.  Brown was engaged by Video to assist  Video in  reviewing  its
financing   needs  and  its   strategic   alternatives.   One  of  the   primary
representatives  at Alex.  Brown  servicing  Video had  previously  served as an
advisor to Knogo while he was employed by Smith Barney Inc., a former  financial
advisor to Knogo.

         Video's rapid growth in 1994 and 1995 led to quality control  problems,
which resulted in a slow down in demand in 1996. The resulting  deterioration in
reported financial results made it necessary for Video to raise capital to build
the  infrastructure  -- both  production  and  marketing  -- needed  to  achieve
profitable  growth.  The  Video  Board  determined  that it would be in the best
interests  of  its   shareholders   to  seek  a  merger  partner  with  existing
under-utilized  infrastructure  rather  than to pursue the  riskier  strategy of
remaining  independent  and  attempting  to build  such  infrastructure  itself,
particularly  when  the  capital  for such  infrastructure  was  expected  to be
expensive.  See  "BUSINESS OF SENTRY."  Preliminary  discussions  were held with
several potential partners.

         The Alex.  Brown  representative,  because  of his  knowledge  of,  and
contacts with, Knogo, suggested Knogo to Video as a potential partner. The Video
Board  determined that Knogo was the most attractive  potential  partner due to,
among others, the following factors:  (i) Knogo had sufficient excess production
and marketing  capacity;  (ii) Knogo's  product line and business  strategy were
well-aligned with those of Video; and (iii) because of the relatively


                                       22
<PAGE>

equal pro forma equity distribution of common shares, Video's shareholders would
truly share in the benefits of the Merger and the potential future growth of the
combined entity.

         During the summer of 1996,  the  senior  management  of Knogo and Video
engaged in  preliminary  discussions  and due  diligence  to explore a strategic
business  alliance between the two companies.  By the week of September 9, 1996,
the  preliminary  discussions  had evolved  into more serious  negotiations.  On
September  11,  1996,  senior  management  of both  companies  met to  outline a
proposed  business  combination.  However,  the  parties  did  not  come  to any
meaningful  agreement and therefore continued their discussions through the week
of September 16, 1996.

         On September 6, 1996, Dennis R. Johnson, a Video director,  accompanied
by a  representative  of Alex.  Brown,  and Dewey  Ballantine,  legal advisor to
Video,  visited  the  facilities  of Knogo to  perform  due  diligence,  examine
documents and discuss Knogo's  projections  and the  assumptions  underlying the
projections.  Mr. Johnson prepared a memorandum, dated September 7, 1996, to the
Chairman of the Board of Video, Mr. Furst, summarizing his findings.

         On September  23, 1996,  the senior  management of Knogo and Video held
another meeting at which the Video account  representative  from Alex. Brown was
present.  Nearing  agreement  in  principle,  the  parties  engaged  in  several
telephone  conversations  during the week of September 23, 1996 and met again on
September 27, 1996. The parties prepared and circulated a preliminary term sheet
dated  September 27, 1996,  containing  some  tentative  principal  terms of the
Merger.

         The parties met again on October 1, 1996 and tentatively  agreed to the
essential terms of the Merger. As a result of such meeting, the parties prepared
and circulated, on October 2, 1996, a revised term sheet containing the proposed
principal terms of the Merger.

         During the week of September 30, 1996,  Knogo (x) undertook  additional
due diligence with respect to Video,  including  examination  of documents,  and
meetings with Video's management to discuss Video's operating history and future
prospects,  (y) contacted  several  investment banks and  subsequently  retained
Donald & Co.  as its  financial  advisor  with  respect  to the  Merger  and (z)
circulated  the  October 2, 1996 draft term sheet and  information  relating  to
Video and its business to Knogo's Board in  anticipation of a meeting of Knogo's
Board to review  the  Merger.  During  the week of  September  30,  1996,  Video
undertook  additional  due diligence  with respect to Knogo and  circulated  the
October  2, 1996  draft term  sheet and  information  relating  to Knogo and its
business  to Video's  Board in  anticipation  of a meeting  of Video's  Board to
review the proposed Merger.

         From  October 1, 1996 through  October 10, 1996,  members of the senior
management  of Video  and  Knogo,  together  with  their  respective  legal  and
financial  advisors,  negotiated the terms of the Merger Agreement.  During this
period,  Mr. Furst, Mr. Benson, Mr. Perlmuth,  and Mr. Nicolette  negotiated the
terms of the  Support/Voting  Agreements  pursuant to which, among other things,
each agreed to vote shares beneficially owned by them in favor of the Merger.

   
         In  negotiating  the terms of the proposed  Merger,  the  management of
Video  and  Knogo   took  into   account   various   business,   tax  and  legal
considerations.  One basic concept on which the parties  agreed was that Knogo's
stockholders would receive a preferred position  corresponding  approximately to
the difference  between the net worth that Knogo was  contributing to the merged
entity as  compared  to the net worth being  contributed  by Video (the  "Excess
Knogo Net Worth").  To achieve this, it was agreed that Knogo stockholders would
receive preferred stock with an aggregate face value  approximately equal to the
Excess Knogo Net Worth. To arrive at the allocation of common shares,  the ratio
of Sentry  common  shares to Video common  shares was first fixed at one to one,
then  the  total  number  of  Sentry  common  shares  to be  received  by  Knogo
stockholders  was  determined  based  upon an  analysis  of the ratio of Video's
market  capitalization to Knogo's market capitalization prior to announcement of
the transaction and approximating that ratio with the ratio of Video's pro forma
portion of Sentry's potential market capitalization to Knogo's pro forma portion
of Sentry's potential market capitalization,  plus the value of the Sentry Class
A Preferred Stock to be issued to Knogo stockholders.
    

         On October 7, 1996, a telephonic meeting of the Knogo Board was held to
discuss the proposed  transaction with Video. During such meeting, Mr. Nicolette
and  Knogo's  legal  advisors  reviewed  with the  Knogo  Board  the  status  of
negotiations with Video and the terms of the proposed transaction. Mr. Nicolette
described  Video's  



                                       23
<PAGE>

business,  including,  among other things,  fluctuations  in Video's stock price
since its initial public offering and Video's financial statements and position,
including its  indebtedness  and intangibles on its balance sheet. Mr. Nicolette
also noted the  potential  synergies  that the combined  businesses of Knogo and
Video could  produce.  In  addition,  representatives  from  Stroock & Stroock &
Lavan,  legal  advisors to Knogo,  made a  presentation  to the Knogo Board with
respect to the fiduciary duties of the Knogo directors  relating to the proposed
transaction.  A second  meeting of the Knogo Board was scheduled for October 10,
1996, and the Knogo Board was provided additional  information relating to Video
and the Merger.

         On October 10,  1996,  a meeting of the Knogo Board was held to further
discuss  and  consider  the  proposed  transaction  with Video and to review the
materials  distributed  to the Knogo Board  after the October 7 meeting.  During
such  meeting,  presentations  were made to the Knogo  Board by  Knogo's  senior
management and its financial and legal advisors.  Senior management  expanded on
the  discussions of the October 7, 1996 Knogo Board meeting by making a detailed
presentation of the then current  financial and operational  condition of Video.
Senior management discussed Video's current product, the Video CCTV surveillance
system,  and the product synergies  possible between the CCTV system and Knogo's
existing products.  Senior management also discussed the fiscal  advisability of
the proposed  transaction  and responded  in-depth to numerous  questions  about
future  plans for the  combined  entity.  In addition,  Knogo's  legal  advisors
presented a summary of the terms and provisions of the then current draft of the
Initial Merger  Agreement  (the "Initial  Merger  Agreement")  and reviewed such
document  with the Knogo Board,  including  the  structure  and mechanics of the
transaction.  Representatives from Donald & Co. made a presentation with respect
to the fairness of the consideration to be received by Knogo stockholders in the
Merger.  At such time,  Donald & Co.  presented  to the Knogo  Board its written
opinion  stating that based upon the  assumptions and analysis set forth in such
opinion the  consideration  to be received by Knogo's  stockholders  was fair to
such  stockholders  from  a  financial  point  of  view.  In the  course  of its
presentation, Donald & Co. reviewed the valuations and methodologies it utilized
in connection with its opinions. See "-- Fairness Opinions -- Opinion of Knogo's
Investment Banker."

         After the various presentations and related discussion, the October 10,
1996  meeting was  recessed to enable the Knogo  Board to further  consider  the
Merger and until such time as  negotiations  with  Video of the  Initial  Merger
Agreement could be completed.  Such meeting was reconvened via telephone at 4:00
p.m. on October 10, 1996.  At that time,  the Knogo Board was informed  that the
negotiations  with  Video  as to  the  principal  terms  of the  Initial  Merger
Agreement  had been  finalized.  The Knogo Board then  unanimously  approved the
Initial  Merger  Agreement  and  the  transactions   contemplated   thereby  and
authorized   Knogo's  officers  to  finalize  and  execute  the  Initial  Merger
Agreement.

         Between September 6 and October 10, 1996, Mr. Furst regularly conferred
with each of the Video  directors  individually as to the status of negotiations
and due diligence with respect to Knogo. The Video Board  telephonically  held a
special  meeting on the morning of October 10,  1996 to  consider  the  proposed
Initial Merger  Agreement and the  transactions  contemplated  thereby.  At this
meeting,  members of Video's senior management,  together with Dewey Ballantine,
its legal advisor,  and Alex.  Brown, its investment  banker,  reviewed with the
Video Board, among other things, the background of the proposed Merger,  Video's
strategic alternatives,  financial and valuation analyses of the transaction and
the terms of the Initial  Merger  Agreement.  Materials had been provided to the
Video  Board by its  advisors  in advance  and the Video  Board  reviewed  these
materials and questioned its advisors  regarding them.  Representatives of Dewey
Ballantine and Alex.  Brown made  presentations to the Video Board and discussed
with the Video Board their views and analyses of various aspects of the proposed
Merger.  Dewey Ballantine made a presentation to the Video Board with respect to
the  fiduciary   duties  of  the  Video  directors   relating  to  the  proposed
transaction.  Alex. Brown delivered its oral opinion (subsequently  confirmed in
writing) to the Video Board that, based upon the matters  presented to the Video
Board and as set forth in its  opinion,  as of such date,  the Merger is fair to
the  holders of Video  Common  Stock from a financial  point of view.  The Video
Board then adjourned the special  meeting to allow time for the Board members to
consider the transaction, materials and presentations regarding the Merger.

         On the afternoon of October 10, 1996,  the Video Board  reconvened  its
special  meeting.   At  that  time,  the  Video  Board  was  informed  that  the
negotiations  with  Knogo  as to  the  principal  terms  of the  Initial  Merger
Agreement had been finalized. After extensive discussion and consideration,  the
Video  Board   unanimously   approved  the  Initial  Merger  Agreement  and  the
transactions  contemplated  thereby and  authorized the execution of the Initial
Merger Agreement.


                                       24
<PAGE>

         Following  adjournment  of the Video Board  meeting and the Knogo Board
meeting on October 10, 1996,  Video and Knogo finalized and executed the Initial
Merger  Agreement and then  publicly  announced  the  transactions  contemplated
thereby.

   
         Following  execution  of the Initial  Merger  Agreement  on October 10,
1996,  but  before  consummation  of the  Merger,  Video and Knogo  amended  and
restated   the  Initial   Merger   Agreement   as  of  November  27,  1996  (the
"Amendments").  The  Amendments  modified the term "Hurdle Price" as used in the
Sentry  Certificate  of  Incorporation,  such  that the  Hurdle  Price  would be
determined  one year from the  Effective  Time and could range from a minimum of
$5.00 to a maximum of $6.50  depending  upon the  average  trading  price of the
Common Stock.  See  "DESCRIPTION  OF SENTRY CAPITAL STOCK -- Preferred  Stock --
Class A Preferred  Stock." The Amendments also  eliminated the requirement  that
Mr. Furst loan Sentry  $575,000,  less any amount already loaned by Mr. Furst to
Video under the October  1996 Note (as defined  below) from Video to Mr.  Furst.
See "VIDEO  MANAGEMENT'S  DISCUSSION  AND  ANALYSIS OF FINANCIAL  CONDITION  AND
RESULTS  OF  OPERATIONS  --  Liquidity  and  Capital   Resources"  and  "CERTAIN
TRANSACTIONS  OF VIDEO." In addition,  the  Amendments  eliminated the provision
requiring Sentry to deposit cash with the Exchange Agent to pay shareholders for
fractional  interests in Sentry Common Stock and Sentry Class A Preferred Stock.
Instead,  fractional interests will be aggregated by the Exchange Agent and sold
on behalf of stockholders who would otherwise have been entitled to receive such
fractional  shares as soon as practicable after the Effective Time. The Exchange
Agent will  distribute  proceeds  from such sale to  stockholders  who otherwise
would  receive  fractional  interests in the Sentry  Common Stock and/or  Sentry
Class A  Preferred  Stock,  as the case may be.  See "THE  MERGER  AGREEMENT  --
Exchange  Procedure."  Moreover,  the  Amendments  clarified  that the Merger is
conditioned,  among other things,  upon the Sentry Class A Preferred Stock being
listed on NASDAQ or a national  securities  exchange,  subject  only to official
notice of  issuance.  See the "THE MERGER  AGREEMENT  --Conditions."  The Merger
Agreement was amended  again on January 10, 1997 to further  modify the terms of
the  Sentry  Class A  Preferred  Stock  in  order  to  satisfy  certain  listing
requirements of the AMEX.
    


Recommendation of Video Board; Video's Reasons for the Merger

         THE VIDEO BOARD UNANIMOUSLY RECOMMENDS THAT HOLDERS OF VIDEO COMMON
STOCK VOTE FOR THE VIDEO PROPOSAL.

         On October  10,  1996,  the Video Board  received  and  considered  the
presentations  of the  management of Video and its  investment  banker and legal
advisor  regarding  the Merger,  and  unanimously  approved  the Initial  Merger
Agreement.  On November  27,  1996,  the Video  Board  considered  the  proposed
amendments  to the  Initial  Merger  Agreement  and  unanimously  approved  such
amendments and the Merger  Agreement.  THE VIDEO BOARD HAS  DETERMINED  THAT THE
MERGER IS IN THE BEST INTERESTS OF VIDEO AND ITS  SHAREHOLDERS  AND  UNANIMOUSLY
RECOMMENDS THAT THE  SHAREHOLDERS OF VIDEO VOTE FOR THE APPROVAL AND ADOPTION OF
THE MERGER AGREEMENT.

         In view of the variety of factors  considered  in  connection  with its
evaluation of the Merger,  the Video Board did not quantify or otherwise attempt
to assign relative weights to the specific factors it considered in reaching its
determination.

         In  reaching  its  determination  to  recommend  approval of the Merger
Agreement, the Video Board consulted with Video management, as well as its legal
counsel and investment  banker,  and  considered a number of factors.  The Video
Board believes the Merger offers Video and its shareholders a unique opportunity
to create a leading  electronic  surveillance  company  which  can  provide  the
critical mass and  economies of scale  necessary to compete  effectively  in the
current business environment. The Video Board considered the nature and scope of
the business of Knogo,  the access it provides to an established  manufacturing,
distribution  and service  infrastructure,  its stable  capital  structure,  the
quality of Knogo's  management team, its competitive  position and prospects for
further  development.  The combined  operations of Video and Knogo may provide a
proprietary,  integrated  product line,  efficient  production and distribution,
reduced operating costs and improved access to capital.

         In reviewing  Knogo's  business,  the Video Board took into account the
complementary  nature of the businesses of the two companies,  which have little
overlap   and   which   present    opportunities   for   cross-utilization   and
cross-promotion  of assets of each  company in the  businesses  operated  by the
other. The Video Board considered that the quality of Knogo's management and the
complementary nature of the two companies' businesses create


                                       25
<PAGE>

significant  opportunities  for development in the companies on a combined basis
without  the  need  for   significant   restructuring,   redirection   or  asset
dispositions.  In addition,  the Video Board reviewed a financial  comparison of
Video and Knogo and studied the  potential  impacts of the Merger on the balance
sheet of the new combined company.  The Video Board studied the potential effect
on the earnings per share of the new combined company as a result of the Merger.
The Video Board also took into account the historical  performance of the common
stock of each of Video and Knogo,  as well as the  historical  price-to-earnings
multiples of the two companies.

         The Video  Board  considered  the terms and  conditions  of the  Merger
Agreement,  including (i) the conversion  ratio of shares of Sentry Common Stock
for shares of Video Common Stock and Knogo  Common  Stock,  which will result in
Video  shareholders  having  voting  control,  and (ii) the  financial  costs of
issuance of the Sentry  Class A Preferred  Stock to Knogo  stockholders  and the
possibility of the conversion of such stock into Sentry Common Stock.

         The Video Board considered the provisions of the Merger Agreement which
prohibit Knogo and its subsidiaries,  and their respective directors,  officers,
employees and representatives from soliciting or encouraging any Merger Proposal
or, subject to the fiduciary  duties of the Knogo Board,  from  negotiating with
any third  parties with respect to a Merger  Proposal.  The Video Board  further
considered  the  provisions of the Merger  Agreement  which require Knogo to pay
Video for fees and expenses Video has incurred up to $750,000,  exclusive of the
sharing of costs and expenses related to this Joint Proxy  Statement/Prospectus,
if a Merger  Proposal  is made for or  solicited  by Knogo,  or the Knogo  Board
withdraws  or  modifies,   in  a  manner  adverse  to  Video,  its  approval  or
recommendation  of the Merger  Agreement or the Merger,  and  thereafter (i) the
Merger  Agreement is  terminated by Video or Knogo and (ii) within six months of
the  termination,  Knogo  is  a  party  to  a  merger,  acquisition  or  similar
transaction  involving  the  purchase of a  significant  portion of the stock or
assets of Knogo.

         The Video Board  considered the oral opinion of Alex. Brown rendered on
October 10, 1996 (and  subsequently  confirmed in  writing),  that the Merger is
fair to the holders of Video Common Stock from a financial point of view. A copy
of Alex.  Brown's  written  opinion to the Video  Board,  dated the date of this
Joint Proxy  Statement/Prospectus,  which  confirms  the opinion of Alex.  Brown
dated  October 10, 1996,  is attached  hereto as Appendix B and is  incorporated
herein by reference.  See "-- Fairness Opinions -- Opinion of Video's Investment
Banker." In addition, the Video Board considered the presentation of Alex. Brown
made at the Video Board meeting held on October 10, 1996.

Recommendation of Knogo Board; Knogo's Reasons for the Merger

         THE KNOGO BOARD  UNANIMOUSLY  RECOMMENDS  THAT  HOLDERS OF KNOGO COMMON
STOCK VOTE FOR THE KNOGO PROPOSAL.

   
         At  meetings of the Knogo Board held on October 7, 1996 and October 10,
1996,  the Knogo  Board  received  and  considered  presentations  of the senior
management of Knogo and its legal and financial  advisors  regarding the Merger.
At  the  resumption  of its  meeting  on  October  10,  1996,  the  Knogo  Board
unanimously   approved  the  Initial  Merger   Agreement  and  the  transactions
contemplated  thereby and  authorized  the  officers  of Knogo to  finalize  and
execute the Initial  Merger  Agreement  and to prepare,  execute and deliver any
amendments  thereto as may be deemed  necessary or appropriate by such officers,
in each case in such form as the officer or officers  executing  the same,  with
and upon advice of counsel, may approve. THE KNOGO BOARD HAS DETERMINED THAT THE
MERGER IS IN THE BEST INTERESTS OF KNOGO AND ITS  STOCKHOLDERS  AND  UNANIMOUSLY
RECOMMENDS THAT THE  STOCKHOLDERS OF KNOGO VOTE FOR THE APPROVAL AND ADOPTION OF
THE MERGER AGREEMENT.
    

         In its evaluation of the Merger,  the Knogo Board  considered a variety
of factors including  presentations to such Board by Knogo's  management and its
financial and legal  advisors.  In view of the variety of factors  considered by
the Knogo Board in reaching its determination,  it did not quantify or otherwise
attempt to assign  relative  weights to the specific  factors it  considered  in
reaching its determination.

   
         Knogo has from time-to-time  considered various strategic  alternatives
to maximize  shareholder  value.  Knogo believes one important  factor affecting
shareholder  value  is  Knogo's  ability  to  offer  a  comprehensive   line  of
security-related   products.   A  more  comprehensive   product  line  will,  in
management's  view,  permit Knogo to compete more effectively with its principal
competitors, some of which are larger and have substantially greater 


                                       26
<PAGE>

capital resources than Knogo. Many of Knogo's competitors offer CCTV products as
components of their integrated  product lines.  Therefore,  one of Knogo's major
strategic  goals has been to make  available to Knogo's  customers a proprietary
CCTV product that would not only diversify  Knogo's  existing  product lines but
would also be available as an  integrated  component  of Knogo's  other  product
offerings.  Knogo's  management  believes that the CCTV market  provides a solid
growth opportunity with expanding  applications and has,  therefore,  desired to
increase its presence in the CCTV market. In pursuing this goal, however,  Knogo
has been  particularly  concerned  that any CCTV  product  which it  offers  not
compromise  the high  standard  and  reputation  for quality  and service  which
Knogo's existing products have established.  As a result,  although Knogo has at
various  times  considered  other  CCTV  products,  none of these  was  deemed a
suitable  candidate to become Knogo's  proprietary  product  offering.  Instead,
Knogo has for the past four  years  elected  to act as a system  integrator  and
installer of  non-proprietary  CCTV products acquired from third parties.  Knogo
was ultimately  presented with the opportunity to meet this business development
objective when it was introduced to Video. Having reviewed several CCTV products
in the  marketplace,  Knogo  believes  that an alliance  with Video would permit
Knogo to offer a proprietary  and  technologically  innovative CCTV product that
would compete well with the CCTV products offered by Knogo's competitors.
    

         In  evaluating  Video's  business,  Knogo has found  several  potential
synergies with its own business.  First,  Knogo is keen to continue to introduce
quality  products into its product lines.  Knogo believes that Video's  products
compare  favorably  to the high  quality  products  that Knogo  provides  to its
customers. In reaching this determination, Knogo's management has relied in part
on the  experiences  of its own sales and service  staff with Video's  products.
Knogo's staff has had some limited  experience in installing  Video's  products.
Based on their  exposure to Video's  products,  Knogo's  staff members have been
favorably disposed toward Video's product line.

         Second,   Knogo  believes  that  it  has  financial  resources  and  an
operational  infrastructure  that  Knogo and Video can  collectively  exploit to
permit Video's products,  and any enhancements  thereto, to more rapidly achieve
success in the marketplace.  Knogo believes that its operating infrastructure is
currently  underutilized by Knogo's existing product  offerings.  Knogo believes
that at present it can easily promote and offer new products within its existing
operational  capacity.  In  addition,  although  Knogo has been  increasing  its
third-party  sales, such sales may not grow as rapidly as necessary for Knogo to
utilize its excess  operational  capacity,  particularly  after  Knogo's  Supply
Agreement with Sensormatic terminates. See "BUSINESS OF KNOGO -- Production" and
"BUSINESS OF KNOGO -- Competition." In this regard,  Knogo expects that, through
its extensive manufacturing,  marketing and distribution capabilities, Knogo can
fundamentally assist Video with the production and sale of Video's products.

         In addition to its day-to-day operational capacity, Knogo believes that
it can offer Video access to Knogo's technological expertise. In the judgment of
its  management,  Knogo can readily  adapt the  technological  expertise  it has
developed in the EAS area to assist Video in the  research  and  development  of
further innovations to Video's existing CCTV product line. Due to its resources,
Knogo may well be able to assist Video in developing  more  innovative  and cost
effective CCTV solutions for the benefit of both their customers.

         Knogo's  management  believes  that  the  Knogo  and  Video  businesses
complement  each other.  The Merger  provides  Knogo and Video access to a wider
array of products and customers in the  anti-theft  and security  fields and the
resources  with which to exploit the  increased  sales of such  products to such
customers.  The  combination of Knogo's and Video's  businesses  is,  therefore,
expected to accelerate the strategic growth plans of both companies.

         The Knogo Board  considered the business  opportunity  presented by the
Merger,  noting, in particular,  the belief of Knogo's  management that the CCTV
market  presents  prospects for growth and expansion.  In this light,  the Knogo
Board reviewed the terms of the Merger Agreement, including, among other things,
the consideration to be received by Knogo  stockholders and Video  shareholders.
In evaluating such consideration,  the Knogo Board weighed the opinion of Donald
& Co. (including the underlying analysis and assumptions) that the consideration
to be received by Knogo  stockholders in the Merger is fair to such stockholders
from a financial  point of view.  In addition,  the Knogo Board  considered  the
provisions of the Merger  Agreement  which prohibit Video and its  subsidiaries,
and their respective  directors,  officers,  employees and representatives  from
soliciting or  encouraging  any Merger  Proposals  or,  subject to the fiduciary
duties of the Video Board,  from negotiating with any third parties with respect
to a Merger Proposal.  The Knogo Board further  considered the provisions of the
Merger  Agreement  which require Video to pay Knogo for fees and expenses  Knogo
has  incurred up to  $750,000,  exclusive  of the sharing of costs and  expenses
related to this Joint Proxy  Statement/Prospectus,  if a Merger Proposal is made
for or solicited by Video, or the Video Board withdraws or modifies, in a manner
adverse to Knogo, its approval or


                                       27
<PAGE>

recommendation  of the Merger  Agreement or the Merger,  and  thereafter (i) the
Merger  Agreement is  terminated by Knogo or Video and (ii) within six months of
the  termination,  Video  is  a  party  to  a  merger,  acquisition  or  similar
transaction  involving  the  purchase of a  significant  portion of the stock or
assets of Video.  Based on its  thorough  review of the facts,  the Knogo  Board
unanimously  concluded that the Merger complements Knogo's long-term development
goals and that it is  expected  to produce  favorable  results for Knogo and its
stockholders.

Fairness Opinions

Opinion of Video's Investment Banker

         Video  retained  Alex.  Brown  on  April  25,  1996  to act as  Video's
financial advisor in connection with the Merger, including rendering its opinion
to the Video Board as to the fairness to Video's shareholders,  from a financial
point of view,  of the  exchange  ratio used (the  "Exchange  Ratio") to convert
Video Common Stock to Sentry Common Stock.

         At the October 10, 1996 meeting of the Video Board,  representatives of
Alex.  Brown  rendered to the Video Board its oral  opinion  with respect to the
Merger,  subsequently  confirmed in writing as of the same date, that as of such
date, and subject to the assumptions  made,  matters  considered and limitations
set forth in such opinion and  summarized  below,  the Exchange  Ratio was fair,
from a financial point of view, to Video's shareholders. The opinion was updated
by  delivery  of a  written  opinion  dated as of the date of this  Joint  Proxy
Statement/Prospectus.  No limitations were imposed by the Video Board upon Alex.
Brown with respect to the  investigations  made or procedures  followed by it in
rendering its opinion.

         The full text of Alex.  Brown's written opinion dated as of the date of
this Joint Proxy  Statement/Prospectus  (the "Alex. Brown Opinion"),  which sets
forth, among other things,  assumptions made, matters considered and limitations
on the review  undertaken,  is attached hereto as Appendix B and is incorporated
herein by  reference.  Video's  shareholders  are urged to read the Alex.  Brown
Opinion  in its  entirety.  Alex.  Brown  did not  recommend  to Video  that any
specific  exchange ratios  constituted  the  appropriate  Exchange Ratio for the
Merger.  The Alex. Brown Opinion is directed to the Video Board,  addresses only
the  fairness of the  Exchange  Ratio to Video's  shareholders  from a financial
point of view and does not constitute a recommendation  to any Video shareholder
as to how such  shareholder  should vote at the Video Meeting.  The Alex.  Brown
Opinion was  rendered to the Video Board for its  consideration  in  determining
whether to approve  the Merger  Agreement.  The  discussion  of the Alex.  Brown
Opinion in this Joint Proxy Statement/Prospectus is qualified in its entirety by
reference to the full text of the Alex. Brown Opinion.

         In  connection  with the Alex.  Brown  Opinion,  Alex.  Brown  reviewed
certain publicly available financial and other information  concerning Video and
Knogo and certain  internal  analyses and other  information  furnished to it by
Video and Knogo.  Alex.  Brown  also held  discussions  with the  members of the
senior  managements of Video and Knogo regarding the businesses and prospects of
their  respective  companies and the joint prospects of a combined  company.  In
addition,  Alex. Brown (i) reviewed the reported prices and trading activity for
the common stock of both Video and Knogo,  (ii) compared  certain  financial and
stock  market  information  for Video and Knogo  with  similar  information  for
selected  companies  whose  securities are publicly  traded,  (iii) reviewed the
financial terms of selected recent business combinations which it deemed related
in whole or in part, (iv) reviewed the terms of the Merger Agreement and certain
related  documents,  and (v)  performed  such other  studies  and  analyses  and
considered such other factors as it deemed appropriate.

         In  conducting  its review and  arriving at its  opinion,  Alex.  Brown
assumed  and  relied  upon,  without  independent  verification,  the  accuracy,
completeness and fairness of the information  furnished to or otherwise reviewed
by or discussed  with it for purposes of rendering its opinion.  With respect to
the financial  projections of Video and Knogo and other information  relating to
the prospects of Video and Knogo provided to Alex. Brown by each company,  Alex.
Brown  assumed  that such  projections  and other  information  were  reasonably
prepared and reflected the best currently  available  judgments and estimates of
the respective  managements of Video and Knogo as to the likely future financial
performances  of their  respective  companies  and of the combined  entity.  The
financial  projections of Video and Knogo that were provided to Alex. Brown were
utilized  and  relied  upon by Alex.  Brown in the Pro  Forma  Merger  Valuation
summarized  below.  Alex.  Brown  assumed,  with the consent of Video,  that the
Merger  will  qualify  as a  tax-free  reorganization  for  federal  income  tax
purposes.  Alex.  Brown did not make,  and was not provided with, an independent
evaluation or appraisal of the assets of Video and Knogo, nor has Alex.


                                       28
<PAGE>

Brown been furnished with any such  evaluations or appraisals.  The Alex.  Brown
Opinion is based on market,  economic and other  conditions  as they existed and
could be evaluated as of the date of such opinion letter.

         The  following  is a summary  of the  analyses  performed  and  factors
considered by Alex. Brown in connection with rendering the Alex. Brown Opinion.

         Historical  Financial Position.  In rendering its opinion,  Alex. Brown
reviewed and analyzed the historical and current financial  condition of each of
Video and Knogo which  included  among other things (i) an  assessment of recent
financial  statements;  (ii) an analysis of revenue  growth,  margin  trends and
other  operating  performance  indicators;  and  (iii)  the  companies'  capital
structures.

         Historical Stock Price  Performance.  Alex. Brown reviewed and analyzed
the daily  closing per share market  prices and trading  volume for Video Common
Stock,  from October 21, 1994 to October 7, 1996 and,  for Knogo  Common  Stock,
from January 3, 1995 to October 7, 1996. In addition,  Alex.  Brown reviewed the
daily  closing per share  market  prices and trading  volume for Video and Knogo
over the period  from  October 6, 1995 to  October  7,  1996.  Alex.  Brown also
reviewed the daily closing per share market prices of the Video Common Stock and
Knogo Common Stock and compared the movement of such daily  closing  prices with
the  movement of the NASDAQ  composite  average  over the period from October 9,
1995 through October 7, 1996. Alex. Brown noted that, on a relative basis, Video
and Knogo  each  underperformed  the  NASDAQ  composite  average  and that Knogo
outperformed  Video for this  period.  Over the one year period from October 10,
1995 through October 7, 1996, Knogo Common Stock price  moderately  outperformed
Video Common Stock price. This information was presented to give the Video Board
background  information regarding the respective stock prices of Video and Knogo
over the periods indicated.

         Pro Forma Merger  Valuation.  Alex.  Brown  analyzed the implied  share
price of the  combined  entity  based on the  terms of the  transaction  and the
individual market values of both Video and Knogo. To do so, Alex. Brown combined
the  equity  market  capitalizations  of both  companies  as of October 8, 1996,
subtracted the aggregate  amount of the Sentry Class A Preferred  Stock (assumed
for purposes of this  analysis to have a market value of 90% of its Face Value),
and divided the resulting implied common equity value of Sentry by the pro forma
number of Sentry common  shares,  the net result of which was an implied  Sentry
share price of $4.33 (the "Arithmetic Price"). Alex. Brown noted that this price
ignored the market value of the  synergies  which were expected to be created by
the  transaction.  An implied total equity value  ("Implied Total Equity Value")
for both Video and Knogo was derived by multiplying the Arithmetic  Price by the
pro forma issued common shares  outstanding for each company  resulting from the
Merger  plus those  options  deemed  exercisable  at the  Arithmetic  Price,  in
addition to the  discounted  value of the  preferred  stock  issued.  An implied
enterprise  value ("Implied  Enterprise  Value") for each of Video and Knogo was
derived by adding the Implied  Total  Equity  Values of each  company to the pro
forma debt of each  company as of December 31,  1996.  The Implied  Total Equity
Value for both Video and Knogo was  divided by their  respective  total  current
outstanding  common  shares  prior to the Merger,  to produce an implied  equity
value  per  share  ("Implied  Equity  Value")  for  each.  The  implied  premium
represented  by the  Implied  Equity  Value  less the  value of  options  deemed
exercisable  at the  Arithmetic  Price of each of Video and Knogo was calculated
based on the one month average price through  October 8, 1996 for Video of $3.41
and Knogo of $7.41.  Based on this analysis,  the calculated  implied premium to
the  one  month  average  price  of  Video  and  Knogo  was  27.1%  and  (0.9%),
respectively.

         From the derived  implied equity values and implied  enterprise  values
described  above,  implied  transaction  multiples  were  calculated.  Financial
information used in connection with the multiples provided below with respect to
Video and Knogo was based on the latest reported 12 month period as derived from
publicly available information;  estimated calendar year 1996 figures were based
on management's  projections for Video and published investment banking research
on Knogo for Knogo.  Such financial  information  included,  among other things,
ratios  of  Implied  Enterprise  Value to  revenues,  earnings  before  interest
expense,  income taxes and depreciation and amortization ("EBITDA") and earnings
before interest expense, and income taxes ("EBIT"), each for the latest reported
12 month period as derived from publicly  available  information;  and ratios of
the Implied Total Equity Value to net income,  for the latest  reported 12 month
period as derived from publicly  available  information,  and book value,  as of
June 30,  1996.  Alex.  Brown noted  that,  on a trailing  12 month  basis,  the
multiple of Implied Enterprise Value to revenues was 5.2x for Video and 1.6x for
Knogo;  the  multiple of Implied  Enterprise  Value to EBITDA was  negative  and
therefore not meaningful for Video and 17.3x for Knogo;  the multiple of Implied
Enterprise  value to EBIT was not meaningful for Video and 32.9x for Knogo.  For
estimated 1996 figures, the 



                                       29
<PAGE>

multiple of Implied Enterprise Value to revenues was 6.3x for Video and 1.6x for
Knogo; the multiple of Implied Enterprise Value to EBITDA was not meaningful for
Video and 25.9x for Knogo; the multiple of Implied  Enterprise Value to EBIT was
not meaningful for Video and 42.1x for Knogo. Alex. Brown further noted that the
multiple  of  Implied  Equity  Value to  trailing  12 month net  income  was not
meaningful  for Video and 35.6x for Knogo,  and to estimated  1996 figures,  not
meaningful  for Video and 53.7x for Knogo;  the multiple of Implied Equity Value
to book value was 10.6x for Video and 1.7x for Knogo.

         Contribution Analysis.  Alex. Brown analyzed the relative contributions
of Video and  Knogo,  as  compared  to the pro  forma  income  statement  of the
combined  company,  based on the latest reported 12 month period.  This analysis
showed that on a pro forma  combined  basis,  based on the 12 month period ended
June  30,  1996  for  Video  and  Knogo,  Video  and  Knogo  would  account  for
approximately 15.0% and 85.0% respectively,  of the combined company's pro forma
revenue and approximately 7.7% and 92.3% respectively, of the combined company's
pro forma book  value.  Because  Video was  operating  at a loss,  multiples  of
EBITDA, EBIT and EPS were not meaningful for comparison purposes.

         Analysis of Selected Publicly Traded Companies.  This analysis examines
a company's  valuation in the public  market as compared to the valuation in the
public market of other selected publicly traded companies.  Alex. Brown compared
certain financial information (based on the commonly used valuation measurements
described   below)  relating  to  Video  and  Knogo  to  certain   corresponding
information  from two groups of publicly  traded  related  companies  (the first
group consisting of two EAS companies:  Sensormatic and Checkpoint Systems, Inc.
("Checkpoint")  (collectively,  the  "Selected EAS  Companies");  and the second
group consisting of two CCTV companies: Vicon Industries,  Inc. and Ultrak, Inc.
(collectively,  the "Selected  CCTV  Companies")).  Such  financial  information
included, among other things, (i) common equity market valuation; (ii) operating
performance; (iii) ratios of common equity market value as adjusted for debt and
cash  ("Enterprise  Value")  to  revenues,  EBITDA,  EBIT,  each for the  latest
reported 12 month period and derived from publicly  available  information;  and
(iv) ratios of trading  common share value ("Equity  Value") to earnings.  Alex.
Brown noted that  because  each of the  selected  groups  consisted  of only two
companies,  it was  difficult  to  draw  conclusions  from  this  analysis.  The
financial  information used in connection with the multiples provided below with
respect to Video,  Knogo,  the Selected  EAS  Companies  and the  Selected  CCTV
Companies  was based on the latest  reported  12 month  period as  derived  from
publicly  available  information.  Estimated  earnings  figures  for Video,  the
Selected CCTV  Companies and the Selected EAS Companies for calendar  years 1996
and 1997 were based on the  Institutional  Brokers Estimate System  ("I/B/E/S");
Knogo estimated earnings for calendar years 1996 and 1997 was based on published
investment  banking research on Knogo.  Alex. Brown noted that, on a trailing 12
month  basis,  the multiple of  Enterprise  Value to revenues was 5.2x for Video
compared to a range of 0.3x to 2.7x,  with a mean of 1.5x, for the Selected CCTV
Companies,  and 1.6x for Knogo compared to a range of 1.7x to 3.5x,  with a mean
of 2.6x,  for the Selected EAS  Companies;  the multiple of Enterprise  Value to
EBITDA was not meaningful for Video compared to a range of 12.8x to 32.6x,  with
a mean of 22.7x,  for the Selected CCTV Companies,  and 17.3x for Knogo compared
to a range  of  15.2x  to  22.6x,  with a mean of  18.9x  for the  Selected  EAS
Companies;  and the multiple of Enterprise  Value to EBIT was not meaningful for
Video  compared  to a range of 19.6x and  37.0x,  with a mean of 28.3x,  for the
Selected CCTV  Companies,  and 32.9x for Knogo,  compared to a range of 32.7x to
33.9x, with a mean of 33.3x, for the Selected EAS Companies. Alex. Brown further
noted that the  multiple of Equity  Value to trailing 12 month  earnings was not
meaningful for Video,  compared to a range of not  meaningful to 55.8x,  for the
Selected CCTV  Companies,  and 35.6x for Knogo,  compared to a range of 47.2x to
62.7x,  with a mean of 55.0x,  for the Selected EAS  Companies;  the multiple of
Equity  Value to  calendar  year 1996  earnings  was not  meaningful  for Video,
compared to a range of not available to 42.0x for the Selected  CCTV  Companies,
and  53.7x for  Knogo,  compared  to a range of 35.5x to  42.5x,  with a mean of
39.0x,  for the  Selected  EAS  Companies;  and the  multiple of Equity Value to
calendar year 1997 earnings was not available for Video,  compared to a range of
not  available to 26.3x for the Selected  CCTV  Companies,  and 16.6x for Knogo,
compared to a range of 18.0x to 28.4x,  with a mean of 23.2x,  for the  Selected
EAS Companies.  As a result of the foregoing procedures,  Alex. Brown noted that
the  implied  multiples  for Video were in general  higher than the range of the
multiples  for the Selected CCTV  Companies and the implied  multiples for Knogo
were  moderately  lower than the range of the  multiples  for the  Selected  EAS
Companies,  results  which Alex.  Brown  deemed to support  the  fairness of the
Exchange Ratio.

         Analysis of Selected Precedent  Transactions.  Alex. Brown reviewed the
financial terms, to the extent publicly  available,  of eight completed  mergers
and  acquisitions   since  February  17,  1991  in  the  following  areas:  CCTV
transactions  (the  "Selected  CCTV  Transactions")  and EAS  transactions  (the
"Selected EAS Transactions"). Alex. Brown calculated various financial multiples
based on certain  publicly  available  information for each of the 


                                       30
<PAGE>

Selected CCTV  Transactions  and the Selected EAS Transactions and compared them
to corresponding financial multiples of Video and Knogo, based on the Arithmetic
Price's application to the companies'  respective  financial  performances.  The
five EAS  transactions  reviewed,  in  reverse  chronological  order  of  public
announcement,  were:  Actron Group  Ltd./Checkpoint  (October 12,  1995),  Knogo
Corporation/Sensormatic    (August   15,   1994),   ID   Systems   International
BV/Checkpoint (May 3, 1993), Security Tag Systems,  Inc./Sensormatic  (September
30, 1992) and ALP Division (ASH PLC)/Sensormatic (July 29, 1992). The three CCTV
transactions  reviewed,  in reverse  chronological order of public announcement,
were:  Burle  Industries,  Inc./Philips  NV (March  6,  1995),  Robot  Research,
Inc./Sensormatic (August 30, 1993) and American  Dynamics/Sensormatic  (February
17,  1991).  Because  all of the CCTV  acquisitions  involved  relatively  small
private companies,  none of the operating data for the targets was available and
thus acquisition multiples were not available. Similarly, because several of the
EAS acquisitions  involved  relatively small private  companies,  several of the
acquisition multiples were not available. Alex. Brown noted that the multiple of
Enterprise  Value to  trailing  12 month  revenues  was 5.2x for Video  while no
acquisition  multiples  were available for the Selected CCTV  Transactions,  and
1.6x for  Knogo  versus a range  of 1.1x to 2.2x,  with a mean of 1.8x,  for the
Selected EAS Transactions; the multiple of Enterprise Value to trailing 12 month
EBITDA was not  meaningful  for Video and 17.3x for Knogo versus a range of 9.5x
to 11.5x,  with a mean of 10.5x,  for the  Selected  EAS  Transactions;  and the
multiple of Enterprise  Value to trailing 12 month EBIT was not  meaningful  for
Video  and 32.9x  for  Knogo  versus a range of 12.2x to  19.7x,  with a mean of
16.0x,  for the Selected EAS  Transactions.  Alex.  Brown further noted that the
multiple of Equity Value times the total  outstanding  common shares to trailing
12 month net income was not  meaningful for Video and 35.6x for Knogo versus the
only available multiple of 36.5x, for the Selected EAS Transactions. Alex. Brown
also noted that the multiple of Equity Value times the total outstanding  common
shares to June 30,  1996 book  value  was 10.6x for Video  while no  transaction
multiples were available for the Selected CCTV  Transactions  and 1.7x for Knogo
versus a range  of 1.6x to  3.5x,  with a mean of  2.3x,  for the  Selected  EAS
Transactions.  All multiples for the Selected CCTV Transactions and the Selected
EAS  Transactions  were  based on public  information  available  at the time of
announcement of such  transaction,  without taking into account differing market
and other conditions  during the five year period during which the Selected CCTV
Transactions and the Selected EAS Transactions occurred.  Despite the relatively
small universe of available data points,  Alex.  Brown  considered the fact that
the implied multiples of revenue and book value for Knogo were within the ranges
paid in the  Selected EAS  Transactions  to support the fairness of the Exchange
Ratio.

         No company used in the analysis of selected  publicly traded  companies
nor any  transaction  used in the  analysis of selected  precedent  transactions
summarized above is identical to Video, Knogo or the Merger.  Accordingly,  such
analyses  must take into account  differences  in the  financial  and  operating
characteristics and other factors that would affect the public trading value and
acquisition  value of the Selected CCTV Companies and the Selected EAS Companies
and  the  Selected  CCTV   Transactions  and  the  Selected  EAS   Transactions,
respectively.

         While the  foregoing  summary  describes  all analyses and factors that
Alex.  Brown deemed material in its presentation to the Video Board, it is not a
comprehensive description of all analyses and factors considered by Alex. Brown.
The  preparation of a fairness  opinion is a complex process  involving  various
determinations  as to the most  appropriate  and  relevant  methods of financial
analysis and the  applications of these methods to the particular  circumstances
and,  therefore,   such  an  opinion  is  not  readily  susceptible  to  summary
description.  Alex.  Brown  believes  that its analyses  must be considered as a
whole and that selecting  portions of its analyses and of the factors considered
by it, without considering all analyses and factors,  would create an incomplete
view of the evaluation process underlying the Alex. Brown Opinion. In performing
its analyses,  Alex. Brown  considered  general  economic,  market and financial
conditions and other matters,  many of which are beyond the control of Video and
Knogo. The analyses  performed by Alex. Brown are not necessarily  indicative of
actual  values  or  future  results,  which  may be  significantly  more or less
favorable than those suggested by such analyses.  Accordingly, such analyses and
estimates  are  inherently  subject to  substantial  uncertainty.  Additionally,
analyses  relating to the value of a business do not purport to be appraisals or
to reflect the prices at which the business  actually may be sold.  Furthermore,
no opinion is being  expressed as to the prices at which shares of Sentry Common
Stock may trade at any future time.

         Pursuant to a letter  agreement  dated April 25, 1996 between Video and
Alex.  Brown,  the fees to date payable to Alex.  Brown for  rendering the Alex.
Brown Opinion have been $200,000 and,  upon  consummation  of the Merger,  Alex.
Brown will  receive a  transaction  fee of  approximately  $800,000  (subject to
certain possible adjustments).  In addition, Video has agreed to reimburse Alex.
Brown for its  reasonable  out-of-pocket  expenses  incurred in connection  with
rendering  financial advisory services,  including fees and disbursements of its
legal  


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<PAGE>

counsel. Video has agreed to indemnify Alex. Brown and its directors,  officers,
agents, employees and controlling persons, for certain costs, expenses,  losses,
claims,  damages and  liabilities  related to or arising out of its rendering of
services under its engagement as financial advisor.

         The Video Board retained  Alex.  Brown to act as its advisor based upon
Alex. Brown's qualifications, reputation, experience and expertise. Alex. Brown,
as a  customary  part of its  investment  banking  business,  is  engaged in the
valuation of businesses  and their  securities  in  connection  with mergers and
acquisitions,  negotiated  underwriting,  private  placements and valuations for
estate,  corporate and other purposes.  Alex. Brown regularly publishes research
reports  regarding the businesses and securities of publicly traded companies in
the  industrial  technology  industry.   Alex.  Brown  may  actively  trade  the
securities  of both Video and Knogo for its own  account  and for the account of
its customers and, accordingly, may at any time hold a long or short position in
such securities.

Opinion of Knogo's Investment Banker

         Donald & Co.  was asked by Knogo to  render  its  opinion  to the Knogo
Board as to the fairness to the public  stockholders of Knogo,  from a financial
point of view, of the consideration (the "Consideration") to be received by such
shareholders  pursuant to the Merger.  Donald & Co.'s  engagement was limited to
such opinion.

         On October 10,  1996,  Donald & Co.  advised the Knogo Board in writing
that based upon and subject to the matters set forth in such writing, as of such
date, the Consideration was fair, from a financial point of view, to the holders
of  outstanding  shares of Knogo Common Stock.  The October 10, 1996 opinion was
updated  by  delivery  of a written  opinion  dated as of the date of this Joint
Proxy Statement/Prospectus (together, the "Donald & Co.
Opinion").

         A copy of the Donald & Co.  Opinion is  attached  hereto as Appendix C.
Knogo  stockholders are urged to read the opinion  carefully and in its entirety
for assumptions made, matters considered,  procedures followed and limits of the
review  undertaken  by Donald & Co. The summary of the Donald & Co.  Opinion set
forth in this Joint Proxy  Statement/Prospectus  is qualified in its entirety by
reference  to the  full  text of such  opinion.  The  Donald & Co.  Opinion  was
prepared  for the Knogo  Board,  is directed  only to the  fairness to the Knogo
stockholders  as of the date of this Joint  Proxy  Statement/Prospectus,  from a
financial point of view, of the consideration to be given to Knogo  stockholders
pursuant to the Merger  Agreement,  and does not constitute a recommendation  to
any stockholder as to how to vote at the Knogo Meeting.  Additionally,  Donald &
Co.'s  opinion  does not express an opinion as to the price or trading  range at
which Sentry's securities will trade subsequent to the date of its opinion.

         In  connection  with its  opinion,  Donald & Co.  (i)  reviewed a draft
Merger Agreement (in substantially the same form as the Initial Merger Agreement
and the Amended and  Restated  Merger  Agreement);  (ii)  reviewed  and analyzed
certain publicly  available  information  concerning Video and Knogo,  including
Commission filings of each company; (iii) reviewed and analyzed certain internal
financial and operating information with respect to the business, operations and
prospects  of Video  furnished  to  Donald & Co.  by Video;  (iv)  reviewed  and
analyzed  certain internal  financial and operating  information with respect to
the business,  operations and prospects of the combined  companies  furnished to
Donald & Co. by Knogo; (v) reviewed and analyzed certain financial  forecasts of
Video and Knogo  prepared by their  respective  managements;  (vi) discussed the
past and current  operations and financial  condition and the prospects of Video
with senior  management  of both Knogo and Video;  (vii)  discussed  with senior
management of Knogo the strategic and operating  benefits  anticipated  from the
Merger, (viii) reviewed the price and trading histories of Video stock and Knogo
securities; (ix) compared the financial positions and operating results of Video
and Knogo  with those of  publicly  traded  companies  it deemed  relevant;  (x)
reviewed the patent position of Video and discussed the competitive  position of
such patent with management of Video; (xi) reviewed  information  concerning the
present  and  future  prospects  of the EAS and CCTV  industry;  (xii)  compared
certain  financial  terms of the Merger to certain  financial  terms of selected
other business  combinations  it deemed  relevant;  and (xiii)  analyzed the pro
forma and  projected  financial  effect of the  combined  entity as reflected in
documents provided by management of Knogo.

         In  analyzing  the  valuation of the  Consideration,  Donald & Co. also
considered  other factors not  necessarily  included in the  financial  analyses
discussed  below.  Of  particular  importance  was Video's  patent  covering the
SentryVision surveillance system which expires in 2010. Donald & Co. was advised
that Video is  pursuing  additional  U.S.  patent  grants  for the  SentryVision
system, and has filed international patent applications for which 


                                       32
<PAGE>

it is awaiting approval.  It was Donald & Co.'s understanding that the currently
existing patent  protection  creates a substantial  obstacle to competitive CCTV
products seeking to use a similar  technology.  Donald & Co. also considered the
benefit to Knogo  common  stockholders  of the  preferred  stock of the combined
companies  which  have  dividend,   redemption  and  liquidation  features.  The
liquidation right approximates Knogo's existing  stockholder's equity.  Finally,
Donald & Co.  placed  reliance on the  desirability  of EAS  companies,  such as
Knogo, having a CCTV capability.

         Donald & Co. assumed and relied upon, without independent verification,
the accuracy and completeness of the information  reviewed by it for purposes of
its opinion.  With respect to financial  projections,  Donald & Co. assumed that
they  had  been  reasonably  prepared  on bases  reflecting  the best  currently
available  information and judgments of the future financial  performance of the
combined  companies.  Donald & Co.  has not  made an  independent  valuation  or
appraisal of the assets or liabilities of Video,  nor has it been furnished with
any such valuations or appraisals. Donald & Co. has also assumed the Merger will
be accounted for as a purchase in accordance with generally accepted  accounting
principles.  The  Donald  & Co.  Opinion  is  necessarily  based  on  financial,
economic,  market and other  conditions as they existed on, and information made
available to it as of, the date of the opinion.

         The following is a brief  summary of certain of the financial  analyses
utilized by Donald & Co. in connection  with  providing its opinion to the Knogo
Board.

         Public  Market  Capitalization  Method.  This  method  compares  market
capitalization  of Knogo to Video based on the stock price as quoted on AMEX for
Knogo of $8.0625 and as quoted on the NASDAQ SmallCap for Video of $4.375,  each
as of the close of  business  on October 9, 1996.  Based on such  prices and the
outstanding  number of shares,  and the in-money  options of each  company,  the
market capitalization of Knogo was $51,100,000 and Video was $22,628,000.  Since
the Knogo stockholders are to receive  approximately  two-thirds of the economic
benefit  of  the  combined  company,  Donald  & Co.  believes  that  the  market
capitalization  of the  combined  company is  $76,652,000.  This  resulted  in a
premium in excess of the  combined  separate  market  capitalization  of the two
entities of between 9.7% to 16.1%.  Even if the entire premium were attributable
to the Video shares,  Donald & Co. believes such premium to be reasonable in the
circumstances.  All of such premium,  however,  cannot be allocated to the Video
shares  since a portion of the premium  must be  attributable  to the  preferred
shares to be received by the Knogo stockholders.

         Market  Capitalization to Net Tangible Book Value Method.  Donald & Co.
analyzed  the  ratio of  market  capitalization  to the  tangible  net  worth of
Sensormatic  and  Checkpoint.  These two  companies  are most  comparable to the
combined company because each is engaged in the EAS industry and has made one or
more   acquisitions  of  CCTV  companies.   Sensormatic  and  Checkpoint  market
capitalization  was 3.7 and 11 times  their  tangible  net worth,  respectively.
Donald & Co. utilized the more conventional Sensormatic multiples to arrive at a
value of $88 million for the combined company. This reflected a premium to Video
shareholders which Donald & Co. believes to be within the range of fairness.

         Capitalization  of  Net  Profit  Method.   Donald  &  Co.  performed  a
discounted  net profit  analysis of the  combined  companies  based on pro forma
fiscal 1997 to 2001 and net profit  projections  provided by the  management  of
Knogo. In performing its analysis,  Donald & Co. applied  discount rates ranging
from 12% to 16% and  determined  present value of such  projected net income for
each  discount.  The  result was added to pro forma net  tangible  book value of
Sentry as provided by Knogo.  This method produced an average valuation of $74.6
million.  Donald & Co. found the valuation  and the resulting  interest of Knogo
stockholders in the Consideration to be within the range of fairness.

         Comparable  Mergers &  Acquisitions  Transaction  Method.  This  method
encompasses an analysis of comparable  acquisitions  in the industry,  including
several involving either Sensormatic or Checkpoint and the acquisition of a CCTV
company. A review of comparable  acquisitions  indicates that EAS Companies have
been  willing to pay  substantial  premiums  for  acquisitions  to enter into or
expand  a  position  in the  CCTV  market.  In  these  situations  there  was no
correlation  between  earnings  and  consideration.   For  example,  Sensormatic
completed  acquisitions  in 1991  and 1992  that  were in fact  dilutive  to its
current  earnings.  This was also the case with the Checkpoint  acquisitions  of
Alarmex and Actron,  both CCTV companies.  In light of the apparent premium paid
for entry into the CCTV market and to the extent that prior purchasers have been
willing to dilute  current  earnings,  Donald & Co.  believes  that the  premium
considered in this transaction is well within the fiscal parameters  obtained 


                                       33
<PAGE>

in prior  transactions.  Donald & Co.  also  noted that  comparable  acquisition
analysis in the EAS industry is difficult  due to the lack of mature  companies.
Donald & Co. is aware of the sale of only one  established  public EAS  industry
entity in recent years.  The  acquisition  price in that instance was 36.5 times
net income. This is a multiple substantially higher than that ordinarily applied
to  growing  technology  companies.  Donald  &  Co.  believes  its  analysis  of
acquisition  prices  supports  the  payment of a  substantial  premium by an EAS
Company that is acquiring a company engaged in the CCTV industry.

         Donald & Co. is an investment  banking firm and is continually  engaged
in the valuation of businesses  and  securities  in connection  with  negotiated
underwritings,  secondary distributions of securities,  private placements,  and
valuations for corporate and other purposes, including mergers and acquisitions.
Donald & Co. has not provided  investment banking services to Knogo prior to its
engagement described herein. Donald & Co. does not make a market in either Video
or Knogo Common Stock.  However, as a full service securities firm, Donald & Co.
may from time-to-time effect transactions for its own account or the accounts of
customers and hold positions in securities of Video and Knogo.  Donald & Co. has
been paid a fee of $35,000 for its services  regarding the Merger, an additional
fee,  in an amount to be  determined,  for the update of its  opinion,  plus the
reimbursement  of its accountable  out-of-pocket  expenses.  Donald & Co.'s fees
were not and will not be  contingent on the  conclusion  reached in its opinion.
Knogo has agreed to indemnify Donald & Co. and its directors,  officers, agents,
employees and controlling persons for certain costs,  expenses,  losses, claims,
damages and  liabilities  related to or arising out of its rendering of services
under its engagement as financial advisor to Knogo.

         The  summary  set  forth  above  does  not  purport  to  be a  complete
description  of the  analyses  performed  by  Donald & Co.  in  arriving  at its
opinion.  The preparation of a fairness  opinion is a complex process and is not
necessarily susceptible to partial analysis or summary description. Donald & Co.
believes that its analyses and the summary set forth above must be considered as
a whole and that selecting  portions of its analyses,  without  considering  all
analyses, or of the above summary, without considering all factors and analyses,
could create an incomplete view of the process underlying the analyses performed
by Donald & Co. in connection  with the  preparation of its opinion  letter.  In
performing its analyses,  Donald & Co. made numerous assumptions with respect to
industry  performance,  general  business  and  economic  conditions  and  other
matters,  many of which are beyond the control of Video and Knogo.  The analyses
performed by Donald & Co. are not  necessarily  indications  of actual values or
actual future results,  which may be  significantly  more or less favorable than
suggested  by such  analyses.  In  addition,  analyses  relating  to  value of a
business  do not  purport to be  appraisals  or to  reflect  the prices at which
businesses actually may be sold.

Interests of Certain Persons in the Merger

         In considering  the respective  recommendations  of the Video Board and
the Knogo  Board  with  respect  to the Merger  Agreement  and the  transactions
contemplated thereby,  shareholders of Video and stockholders of Knogo should be
aware that certain  members of the  management  of Video and Knogo and the Video
Board  and the  Knogo  Board  have  certain  interests  in the  Merger  that are
different  from, or in addition to, the interests of  shareholders  of Video and
stockholders of Knogo generally.

Video

         Directors and Officers.  Two of the current directors of Video,  Robert
D.  Furst,  Jr. and Andrew L.  Benson,  will  become  directors  of Sentry.  See
"MANAGEMENT OF SENTRY -- Directors." In addition,  certain executive officers of
Video,  including Mr.  Benson,  will become  executive  officers of Sentry.  See
"MANAGEMENT OF SENTRY -- Officers."

   
         Mr.  Furst,  Chairman of the Video Board,  is the  beneficial  owner of
976,672 shares  (approximately  19.5% of the shares outstanding) of Video Common
Stock. Mr. Benson, President of Video, is the beneficial owner of 194,278 shares
(approximately 4.0% of the shares outstanding) of Video Common Stock.

         As of the Video Record Date,  the directors  and executive  officers of
Video, and their affiliates, as a group, beneficially own approximately 24.2% of
the  outstanding  shares of Video  Common  Stock  entitled  to vote at the Video
Meeting.  All of such persons have advised  Video that they intend to vote "FOR"
the approval and adoption of the Merger  Agreement and the  consummation  of the
transactions  contemplated  thereby. Such shares will be converted in the Merger
on the same terms and conditions as apply to all shares of Video Common Stock.
    

                                       34
<PAGE>

   
         Employee  Stock Option  Programs and Warrants.  At the Effective  Time,
each  outstanding  option or warrant to purchase shares of Video Common Stock (a
"Video Option" or "Video Warrant,"  respectively)  shall be assumed by Sentry in
such manner that it is converted  into an option or warrant to purchase the same
number of shares of Sentry Common Stock at the same exercise  price.  Each Video
Option  or Video  Warrant  assumed  by  Sentry  will  have the  same  terms  and
conditions as then are applicable to such Video Option or Video  Warrant.  As of
December 31, 1996,  directors and executive  officers of Video held  outstanding
Video Options and/or Video  Warrants to purchase  262,682 shares of Video Common
Stock at exercise prices ranging from $1.17 to $6.75 per share.
    

Knogo

         Directors  and  Officers  of Sentry.  Two of the current  directors  of
Knogo,  Thomas A.  Nicolette and William A. Perlmuth,  will become  directors of
Sentry,  with Mr. Perlmuth  serving as Chairman of the Board. See "MANAGEMENT OF
SENTRY  --  Directors."  In  addition,  certain  executive  officers  of  Knogo,
including Mr. Nicolette, Peter J. Mundy and Peter Y. Zhou, will become executive
officers of Sentry. See "MANAGEMENT OF SENTRY -- Officers."

   
         Mr. Perlmuth, a director of Knogo, is the beneficial owner of 1,077,227
shares  (approximately  18.2% of the shares  outstanding) of Knogo Common Stock,
consisting of 902,527  shares held by Mr.  Perlmuth as Executor of the Estate of
Mr. Arthur J. Minasy,  the former  Chairman and Chief  Executive  Officer of the
Company,  156,300  shares held by Mr.  Perlmuth as trustee  under trusts for the
benefit of Mr. Minasy's adult children,  4,000 shares  beneficially owned by Mr.
Perlmuth, and 14,400 shares issuable upon the exercise of stock options.
    

         As of the Knogo Record Date,  the directors  and executive  officers of
Knogo, and their affiliates, as a group, beneficially own approximately 23.5% of
the  outstanding  shares of Knogo  Common  Stock  entitled  to vote at the Knogo
Meeting,  including  the shares  held by Mr.  Perlmuth as Executor of the Minasy
Estate and as the trustee  under  trusts for the benefit of Mr.  Minasy's  adult
children as  described  in the  preceding  paragraph.  All of such  persons have
advised  Knogo that they intend to vote "FOR" the  approval  and adoption of the
Merger Agreement and the consummation of the transactions  contemplated thereby.
Such shares will be converted in the Merger on the same terms and  conditions as
apply to all shares of Knogo Common Stock.

   
         Employee Stock Option Programs. At the Effective Time, each outstanding
option or right to purchase shares of Knogo Common Stock (a "Knogo Option") will
be  assumed  by Sentry in such  manner  that it is  converted  into an option to
purchase  shares of Sentry Common Stock and Sentry Class A Preferred  Stock,  as
provided  below.  Following the Effective  Time,  each such Knogo Option will be
exercisable  upon the same terms and  conditions as are in effect for such Knogo
Option at the Effective Time,  except that Knogo Options  exercisable for 1.2022
shares of Knogo Common  Stock will be  converted  into an option to purchase one
share of Sentry  Common Stock and one share of Sentry  Class A Preferred  Stock,
(ii) the exercise price of such Knogo Option will be equal to the exercise price
of such  option  as of the date of the  Merger  Agreement  divided  by the Knogo
Common  Stock  Consideration  (as defined in the Merger  Agreement)  (before any
adjustment  relating to proration)  and (iii) all such options shall vest at the
Effective  Time. As of December 31, 1996,  directors  and executive  officers of
Knogo held outstanding  Knogo Options to purchase 476,500 shares of Knogo Common
Stock at exercise prices ranging from $1.72 to $7.00 per share.
    

Employment Agreements

         The current employment  agreements of Mr. Nicolette,  Mr. Mundy and Dr.
Zhou  provide  that in the event of a Change in  Control  of Knogo,  the term of
employment  for each of these  officers will be  automatically  extended for the
period ending two years in the case of Mr. Nicolette's agreement and one year in
the case of the other  agreements  following the date of such Change in Control.
Following  such  Change in  Control,  each such  officer  will have the right to
terminate his employment for Good Reason while  continuing to receive the salary
and bonus otherwise payable thereunder for the remainder of the employment term.
Additionally, the employment agreements provide that in the event of a Change in
Control all options held by each such officer,  whether or not then vested, will
fully vest. The Merger will  constitute a Change in Control for purposes of such
employment  agreements.  However,  in connection with the Merger,  such existing
Knogo  employment  agreements are expected to be terminated by mutual  agreement
and, as of the Effective Time, Messrs. Nicolette and Mundy and Dr. Zhou are each
expected to enter into new employment  agreements with Sentry and, in connection
therewith,  to waive  their  rights  under their  Knogo  employment  agreements.
Nonetheless,  it is anticipated that the new employment agreements for each such
officer,


                                       35
<PAGE>

as well as an  employment  agreement  that Andrew L. Benson is expected to enter
into with Sentry,  will contain similar change in control  provisions.  Any such
provisions  may have the effect of  discouraging  a third  party  from  making a
tender offer or  otherwise  attempting  to obtain  control of Sentry even though
such  a  transaction  might  be  economically   beneficial  to  Sentry  and  its
stockholders.

Indemnification and Liability Insurance

         Indemnification. The Merger Agreement provides that, from the Effective
Time through the later of the sixth  anniversary  of the Effective  Time and the
expiration of any  applicable  statute of  limitations,  Sentry will  indemnify,
defend and hold  harmless,  to the  fullest  extent  that Knogo  would have been
permitted  under  applicable  law,  each person who is at the date of the Merger
Agreement, or has been at any time prior to such date, an officer or director of
Video or Knogo  (individually,  an  "Indemnified  Party" and  collectively,  the
"Indemnified Parties"), against all losses, claims, damages, liabilities,  costs
or expenses (including attorneys' fees), judgments, fines, penalties and amounts
paid in settlement in connection  with any claim,  action,  suit,  proceeding or
investigation arising out of or pertaining to acts or omissions, or alleged acts
or omissions,  by them in their  capacities as such occurring at or prior to the
Effective  Time.  The Merger  Agreement  also  requires  that the  provisions of
Knogo's   Certificate  of   Incorporation   and  Knogo's  Bylaws  providing  for
exculpation  of director and officer  liability and for  indemnification  of the
Indemnified  Parties be  maintained  in such  documents of Sentry,  Video Merger
Corp. and Knogo Merger Corp.

         Directors'  and Officers'  Liability  Insurance.  The Merger  Agreement
provides  that, for a period of six years after the Effective  Time,  directors'
and officers'  liability  insurance will be maintained  covering the Indemnified
Parties who are currently covered, in their capacities as directors and officers
by a  carrier  providing  at  least  the same  coverage  as the  directors'  and
officers'  liability  insurance  currently  maintained by Knogo on terms no less
favorable to the beneficiaries.

Accounting Treatment

         The  Merger  will  be  accounted  for  under  the  purchase  method  of
accounting,  in accordance with generally accepted accounting  principles,  as a
reverse merger pursuant to which Video is acquired by Knogo.  Under the purchase
method of accounting,  the purchase price of $21,804,000 (estimated based on the
equity of Video at September  30, 1996),  including  direct costs of the Merger,
will be allocated  to the assets  acquired and  liabilities  assumed  based upon
their estimated  relative fair values.  Under the purchase method of accounting,
goodwill and other intangibles in the amount of approximately $7,846,000 will be
capitalized and non-recurring  charges of approximately  $13,200,000 relating to
in-process  research and development  will be recorded in the quarter the Merger
is  consummated.  These  amounts are estimates  based on a preliminary  purchase
price allocation and valuation of existing technology and technology in process.
The  financial   statements  of  Knogo  will  become  the  historical  financial
statements of Sentry.  The results of Sentry operations will include the results
of operations of Video and Knogo commencing at the Effective Time.

         The  Unaudited  Pro  Forma  Combined  Condensed  Financial   Statements
appearing  elsewhere  in this Joint  Proxy  Statement/Prospectus  are based upon
certain  assumptions  and allocate the purchase price to assets and  liabilities
based upon preliminary  estimates of their respective fair values. The unaudited
pro forma  adjustments  and  combined  amounts are  included  for  informational
purposes only. If the Merger is consummated,  Sentry's financial statements will
reflect  effects of acquisition  adjustments  only from the Effective  Time. The
actual  allocation  of the  purchase  price may  differ  significantly  from the
allocation  reflected in the Unaudited Pro Forma  Combined  Condensed  Financial
Statements.  The amortization of goodwill and other intangibles after the Merger
will have an adverse effect on the results of operations of Sentry.

Certain Federal Income Tax Consequences

   
         The following is a summary of certain Federal income tax considerations
applicable  to (i)  holders of Video  Common  Stock who,  pursuant  to the Video
Merger,  exchange  their Video Common  Stock solely for Sentry  Common Stock and
(ii) holders of Knogo Common  Stock who,  pursuant to the Knogo Merger, exchange
their Knogo  Common  Stock  solely for Sentry  Common  Stock and Sentry  Class A
Preferred  Stock.  Consummation  of the  Video  Merger is  conditioned  upon the
receipt by Video of an opinion of Dewey  Ballantine,  special  counsel to Video,
based upon  reasonably  requested  representation  letters and dated the Closing
Date, to the effect that the Video Merger will be 
    


                                       36
<PAGE>

   
treated for Federal income tax purposes as a reorganization described in Section
368(a) of the Code  and/or as a  transfer  of  property  to Sentry by holders of
Video  Common  Stock  governed  by Section  351 of the Code.  The portion of the
summary  below under "--  Treatment of Holders of Video Common Stock -- Exchange
of Video Common Stock for Sentry  Common  Stock" and "-- Treatment of Holders of
Video Common Stock -- Cash in Lieu of Fractional  Shares" assumes that the Video
Merger  will be  treated in  accordance  with the  opinion  of Dewey  Ballantine
described above and, in the opinion of Dewey  Ballantine,  accurately  describes
the material  Federal income tax  consequences  for such holders of Video Common
Stock. Consummation of the Knogo Merger is conditioned upon the receipt by Knogo
of an  opinion  of  Stroock &  Stroock & Lavan,  counsel  to Knogo,  based  upon
reasonably requested  representation  letters and dated the Closing Date, to the
effect that the Knogo Merger will be treated for Federal  income tax purposes as
a transfer of property to Sentry by holders of Knogo  Common  Stock  governed by
Section 351 of the Code. The portion of the summary below under "-- Treatment of
Holders of Knogo Common Stock"  assumes that the Knogo Merger will be treated in
accordance with the opinion of Stroock & Stroock & Lavan described above and, in
the opinion of Stroock & Stroock & Lavan,  the discussion  under the subheadings
"--Exchange  of Knogo  Common  Stock for Sentry  Common Stock and Sentry Class A
Preferred  Stock" and "-- Cash in Lieu of Fractional  Shares"  below  accurately
describe the material  Federal income tax consequences for such holders of Knogo
Common Stock.
    

         The  following  summary  is based  upon  the  provisions  of the  Code,
applicable  Treasury  Regulations  thereunder,  judicial  decisions  and current
administrative  pronouncements.  The  summary  does not  address  all aspects of
Federal income  taxation that may be important to particular  taxpayers in light
of their personal  investment  circumstances or to taxpayers  subject to special
treatment  under  the  Federal  income  tax laws  (including  certain  financial
institutions, insurance companies, foreign persons, tax-exempt entities, dealers
in securities  and holders who acquired their Video Common Stock or Knogo Common
Stock  pursuant to the  exercise  of  employee  stock  options or  otherwise  as
compensation)  and does not  address  any  aspect  of  state,  local or  foreign
taxation.  The summary  also  assumes  that the Video Common Stock and the Knogo
Common Stock will be held as capital assets at the Effective Time.

         No rulings  have been or will be requested  from the  Internal  Revenue
Service (the "IRS") with respect to any of the matters discussed herein, and the
opinions of counsel described herein are not binding on the IRS. There can be no
assurance that future legislation, regulations,  administrative rulings or court
decisions  will not adversely  affect the accuracy of the  statements  contained
herein.

Treatment of Holders of Video Common Stock

         Exchange of Video Common  Stock for Sentry  Common  Stock.  A holder of
Video Common Stock who,  pursuant to the Video  Merger,  exchanges  Video Common
Stock solely for Sentry Common Stock will not  recognize  gain or loss upon such
exchange.  However,  such holder may recognize  gain or loss with respect to the
disposition  of  fractional  shares (as discussed  below).  The tax basis of the
Sentry  Common  Stock  received by such holder will be equal to the tax basis of
the Video  Common Stock  surrendered  (less any basis  allocable  to  fractional
shares)  and the  holding  period of the Sentry  Common  Stock will  include the
holding period of the Video Common Stock surrendered.

   
         Cash in Lieu of Fractional  Shares.  A holder of Video Common Stock who
receives  cash in lieu of  fractional  shares of  Sentry  Common  Stock  will be
treated as having received such  fractional  shares pursuant to the Video Merger
and then as having  exchanged such fractional  shares for cash. Any gain or loss
attributable  to fractional  shares  generally will be capital gain or loss. The
amount of such gain or loss will be equal to the difference  between the ratable
portion  of the tax basis of the Video  Common  Stock  surrendered  in the Video
Merger that is allocated to such fractional shares and the cash received in lieu
thereof. Any such capital gain or loss will constitute long-term capital gain or
loss if the Video  Common  Stock has been held by the  holder  for more than one
year at the Effective Time.
    

Treatment of Holders of Knogo Common Stock

         Exchange of Knogo Common Stock for Sentry Common Stock and Sentry Class
A Preferred  Stock.  A holder of Knogo Common  Stock who,  pursuant to the Knogo
Merger,  exchanges  Knogo Common Stock solely for Sentry Common Stock and Sentry
Class A  Preferred  Stock will not  recognize  gain or loss upon such  exchange.
However,  such holder may recognize gain or loss with respect to the disposition
of  fractional  shares  (as  discussed  below).  The  


                                       37
<PAGE>

aggregate  tax basis (the  "Aggregate  Basis") of the  Sentry  Common  Stock and
Sentry Class A Preferred  Stock received by a Knogo  stockholder  will equal the
tax basis of the Knogo Common  Stock  surrendered,  less any basis  allocable to
fractional  shares.  The Aggregate Basis is allocated  between the Sentry Common
Stock and Sentry Class A Preferred  Stock in proportion to the fair market value
of each class of stock as of the date of the Knogo Merger. The holding period of
the Sentry Common Stock and Sentry Class A Preferred Stock received in the Knogo
Merger will include the holding period of the Knogo Common Stock surrendered.

   
         Cash in Lieu of Fractional  Shares.  A holder of Knogo Common Stock who
receives  cash in lieu of  fractional  shares of Sentry  Common  Stock or Sentry
Class A  Preferred  Stock  will be treated as having  received  such  fractional
shares pursuant to the Knogo Merger and then as having exchanged such fractional
shares for cash. Any gain or loss  attributable to fractional  shares  generally
will be capital  gain or loss.  The amount of such gain or loss will be equal to
the difference  between the ratable portion of the tax basis of the Knogo Common
Stock  surrendered  in the Knogo  Merger that is  allocated  to such  fractional
shares and the cash received in lieu thereof. Any such capital gain or loss will
constitute  long-term  capital  gain or loss if the Knogo  Common Stock has been
held by the holder for more than one year at the Effective Time.
    

         Section 306 Stock.  Section 306 of the Code provides  special rules for
the treatment of gain  recognized on the sale or redemption of certain  "Section
306 Stock." If the Sentry Class A Preferred  Stock  received in the Knogo Merger
is considered  Section 306 Stock,  gain on the sale or disposition of the Sentry
Class A  Preferred  Stock will  generally  be  ordinary  income to the extent of
Knogo's  earnings and profits as of the date of the Knogo Merger.  A disposition
under Section 306 includes,  among other things,  pledges of stock under certain
circumstances,  particularly  when the pledgee can look only to the stock itself
as its  security.  In  addition,  if the  Sentry  Class  A  Preferred  Stock  is
considered Section 306 Stock, a redemption of the Sentry Class A Preferred Stock
will be treated as a dividend to the extent of Sentry's  earnings and profits as
of the date of the redemption.  However,  certain  exceptions may apply to avoid
the ordinary income/dividend treatment described above.

         The Sentry  Class A  Preferred  Stock may be Section 306 Stock if it is
considered  stock other than  "common  stock" of Sentry.  The  determination  of
whether  the Sentry  Class A  Preferred  Stock is  considered  common  stock for
Section 306  purposes is an  inherently  factual  question.  Normally,  stock is
treated as other than common stock if it is limited as to its share of dividends
and liquidation proceeds, and does not otherwise participate in corporate growth
to any  significant  extent.  The Sentry  Class A Preferred  Stock shares in all
dividends  distributed  on the Sentry  Common Stock,  shares in the  liquidation
proceeds  with the Sentry  Common  Stock,  and has the ability to  significantly
participate  in the future  growth of Sentry as a result of the terms upon which
the Sentry  Class A  Preferred  Stock may be  redeemed.  Thus,  because of these
inherent equity  features,  Sentry intends to treat the Sentry Class A Preferred
Stock as common stock for Section 306 purposes, and therefore not subject to the
special tax treatment provided under Section 306 of the Code. However, there can
be  no  assurances   that  the  IRS  will  not   successfully   challenge   this
characterization.   The  discussion  below  under  the  heading  "Redemption  or
Conversion  of Sentry Class A Preferred  Stock"  assumes that the Sentry Class A
Preferred Stock is not treated as Section 306 Stock.

         Section 305. Under Section 305 of the Code,  certain  distributions and
deemed  distributions of stock in a corporation are treated as taxable dividends
to the holders of the underlying stock.  Under these  provisions,  if the Sentry
Class A Preferred Stock is not considered  common stock for Section 305 purposes
and the fair market value of the Sentry  Class A Preferred  Stock as of the date
of the Knogo  Merger  is  deemed  to be less than its Face  Value by more than a
statutorily  defined de minimis amount, a Knogo  stockholder will be required to
accrue  annually,  as a distribution of stock,  the difference  between the fair
market value and the Face Value of the Sentry Class A Preferred Stock based on a
constant yield method. In addition, if the Sentry Class A Preferred Stock is not
considered  common  stock for  Section 305  purposes,  (i) the  potential  value
attributable  to  fluctuations in the Deemed Value (as defined) may also have to
be  accrued  annually,  as a stock  distribution,  prior to  receipt  and (ii) a
distribution  of additional  shares of Sentry Class A Preferred Stock to holders
of Sentry Class A Preferred Stock may be a taxable dividend.  Any such deemed or
actual  stock  distribution  will be taxable as a dividend to the extent it does
not  exceed  Sentry's  current  and  accumulated   earnings  and  profits.   The
determination of whether the Sentry Class A Preferred Stock is considered common
stock for Section 305 purposes is an inherently  factual question.  Based on the
same factors  described  above in connection  with the discussion of Section 306
Stock,  Sentry  intends to treat the Sentry  Class A  Preferred  Stock as common
stock for Section 305 purposes,  and not subject to the foregoing  consequences.
However, there can be no assurances that the IRS will not successfully challenge
this characterization.  Moreover,  even if the Sentry Class A Preferred Stock is
considered  common stock, a distribution 


                                       38
<PAGE>

of additional  shares of Sentry Class A Preferred Stock to holders of the Sentry
Class A Preferred Stock within 36 months of the  distribution of money or Sentry
Common  Stock to  holders  of Sentry  Common  Stock may be  treated as a taxable
dividend  to the  extent it does not exceed  Sentry's  current  and  accumulated
earnings and profits.

         Redemption  or  Conversion  of Sentry Class A Preferred  Stock.  Upon a
redemption  of shares of Sentry Class A Preferred  Stock in exchange for cash or
for  Subordinated  Notes,  a holder  will be treated as having  disposed of such
Sentry Class A Preferred  Stock in a  transaction  subject to the  provisions of
Section 302 of the Code.  Accordingly,  such holder will (i)  recognize  capital
gain  or loss  equal  to the  difference  between  the  amount  received  on the
redemption  and such  holder's  tax  basis for such  shares  of  Sentry  Class A
Preferred  Stock or (ii) be treated  as having  received  a  distribution  under
Section 301 of the Code (which will be taxed as a dividend to the extent of such
holder's  share of Sentry's then current or  accumulated  earnings and profits),
depending  upon whether and to what extent such holder owns, or is deemed to own
(under prescribed rules of attribution), shares of Sentry Common Stock or Sentry
Class A Preferred Stock immediately after the redemption.

         A holder whose shares of Sentry Class A Preferred  Stock are  converted
into shares of Sentry Common Stock  generally  will not  recognize  gain or loss
upon such  conversion.  In such event,  a holder's  tax basis for such shares of
Sentry  Common Stock will be equal to such  holder's tax basis for the shares of
Sentry  Class A Preferred  Stock which were  converted  into such Sentry  Common
Stock,  and the holding  period for such Sentry  Common  Stock will  include the
holding period for such Sentry Class A Preferred Stock.

         Notwithstanding the foregoing discussion, it is possible,  although not
entirely clear,  that upon either a redemption or conversion of shares of Sentry
Class A Preferred Stock, a holder of such Class A Preferred Stock may be treated
as having received a dividend distribution to the extent that any portion of the
cash,  Subordinated  Notes or Sentry Common Stock  received on the redemption or
conversion is received in respect of any non-previously taxed accrued but unpaid
(including  any amounts paid in the form of additional  shares of Sentry Class A
Preferred  Stock)  dividends  on such Sentry  Class A Preferred  Stock.  In such
event,  the  tax  consequences  described  above  generally  will  apply  to the
remaining  portion  of the  cash,  Subordinated  Notes or  Sentry  Common  Stock
received on the redemption or conversion.

Reporting Requirements

   
         Each holder of Knogo Common Stock that receives  Sentry Common Stock in
the Knogo  Merger and each holder of Video  Common  Stock that  receives  Sentry
Common  Stock in the Video  Merger will be  required to retain  records and file
with such holder's  Federal income tax return a statement  setting forth certain
facts relating to the Video Merger and Knogo Merger.
    

THE FOREGOING FEDERAL INCOME TAX DISCUSSION IS FOR GENERAL  INFORMATION ONLY, IS
NOT A  SUBSTITUTE  FOR CAREFUL TAX  PLANNING AND MAY NOT APPLY TO ALL HOLDERS OF
VIDEO COMMON STOCK OR TO ALL HOLDERS OF KNOGO COMMON STOCK. HOLDERS ARE URGED TO
CONSULT  THEIR OWN TAX ADVISORS AS TO THE SPECIFIC TAX  CONSEQUENCES  TO THEM OF
THE  MERGERS,  INCLUDING,  WITHOUT  LIMITATION,  THE  APPLICATION  AND EFFECT OF
FOREIGN, STATE, LOCAL OR OTHER TAX LAWS.

Stock Exchange Listing

   
         Sentry  expects  to apply for the  listing of Sentry  Common  Stock and
Sentry Class A Preferred  Stock on the AMEX under the symbols SKV and  SKV.Pr.A,
respectively.  It is a condition to the Merger that the shares of Sentry  Common
Stock and the Sentry Class A Preferred Stock to be issued to Knogo  stockholders
and Video shareholders,  as applicable, in connection with the Merger shall have
been approved for listing on NASDAQ, or a national securities exchange,  subject
only to official notice of issuance.
    

Federal Securities Laws Consequences

         All shares of Sentry Common Stock  received by Video  shareholders  and
shares of Sentry  Common  Stock and Sentry Class A Preferred  Stock  received by
Knogo stockholders in the Merger will be freely transferable, except that shares
of Sentry  Common Stock and Sentry Class A Preferred  Stock  received by persons
who are deemed to be  "affiliates"  (as such term is  defined  under the Act) of
Video or Knogo,  as the case may be,  prior to 


                                       39
<PAGE>

the Merger may be resold by them only in  transactions  permitted  by the resale
provisions  of Rule 145  promulgated  under  the Act (or Rule 144 in the case of
such persons who become  affiliates of Sentry) or as otherwise  permitted  under
the Act.  Persons who may be deemed to be affiliates  of Video,  Knogo or Sentry
generally  include  individuals or entities that control,  are controlled by, or
are under common control with, such party and may include  certain  officers and
directors of such party as well as  principal  stockholders  of such party.  The
Merger Agreement  requires Video and Knogo to use reasonable  efforts to deliver
or cause to be delivered to Sentry,  prior to the Closing Date,  from each Video
or Knogo  affiliate,  a letter agreement to the effect that such person will not
offer or sell or otherwise  dispose of any of the shares of Sentry  Common Stock
and Sentry Class A Preferred  Stock issued to such persons in or pursuant to the
Merger in violation of the Act or the rules and  regulations  promulgated by the
Commission thereunder.

Dissenters' Rights

         Video.  The  following  summary  does  not  purport  to  be a  complete
statement of the rights of dissenting  shareholders  under Sections 302A.471 and
302A.473 of Minnesota Act, and is qualified in its entirety by reference to said
section,  copies  of which  are  attached  as  Appendix  D to this  Joint  Proxy
Statement/Prospectus.

         Subject to certain  conditions,  holders of Video  Common Stock who are
entitled to vote at the Video Meeting have the right under Minnesota Act Section
302A.471 to object to the terms of the Merger, and if the Merger is consummated,
to receive the fair value of their shares immediately before the Effective Time.
Such rights are referred to herein as "Dissenters' Rights," and the Video Common
Stock with  respect  to which  such  rights are  exercised  are  referred  to as
"Dissenting  Shares." A  shareholder  may not  assert  Dissenters'  Rights  with
respect to less than all shares owned by such shareholder.

         A vote  against  the Merger is not  sufficient  to perfect  Dissenters'
Rights. As required by Minnesota Act Section 302A.473, any person who desires to
exercise his Dissenters' Rights with respect to his Video Common Stock must take
each of the following three actions:

                  (a) The shareholder must file with Video, prior to the vote of
         Video shareholders on the Merger Agreement,  a written notice of intent
         to demand the fair value of his shares; and

                  (b) The  shareholder  must not vote his shares in favor of the
         Merger Agreement; and

                  (c) Within 30 days of receiving notice of procedure from Video
         or Knogo (sent after shareholder approval of the Merger Agreement), the
         shareholder  must make written  demand on Video stock  determined as of
         the day  prior to the date on which  the  vote to  approve  the  Merger
         Agreement  was  taken.  The  demand  must  state  the date on which the
         shareholder  acquired the shares,  and the shareholder must deposit all
         share certificates with Video at such time.

         After the Merger takes effect,  or after Video  receives a valid demand
for payment,  Video will remit to each  dissenting  shareholder who has complied
with the above  requirements  the amount Video estimates to be the fair value of
the shares,  plus  interest.  Such  payment  will be  accompanied  by  financial
statements  for  Video  and a  description  of the  basis  for  the  fair  value
determination.  Video may withhold any such remittance from a person who was not
a shareholder on the date the Merger was first announced to the public.

         If a dissenting  shareholder  believes that the amount remitted is less
than the fair value of the shares,  plus interest,  such dissenting  shareholder
may,  within 30 days after Video mails such  remittance,  give written notice to
Video of his own estimate of fair value,  and demand payment of the  difference.
Any dissenting  shareholder who does not file such notice and demand for payment
of difference will only be entitled to receive the amount remitted by Video.

         If Video  receives  such notice and demand for  payment of  difference,
Video shall, within 60 days of receipt of such demand, either (a) pay the amount
demanded,  (b) pay an amount agreed to by such  dissenting  shareholder,  or (c)
file in court a petition requesting court determination of the fair value of the
shares,  plus  interest.  Any such  petition  must be filed  with the  Minnesota
District Court in Hennepin County,  Minnesota.  In addition to the fair value of
the shares,  the court shall determine  whether such dissenting  shareholder has
complied with all procedural requirements.


                                       40
<PAGE>

         Dissenters'  Rights  cannot be validly  exercised by persons other than
the record holders of Video Common Stock, regardless of the beneficial ownership
thereof.  Persons who are  beneficial  owners of Video Common  Stock,  but whose
shares are held of record by another person,  such as a broker, bank or nominee,
should  instruct  the record  holder to follow the  procedure  outlined  in this
section if they wish to  dissent  from the Merger  with  respect to their  Video
Common Stock.

         Failure to follow the steps required by Section 302A.473 for perfecting
Dissenters'  Rights  may  result  in the  loss  of such  rights.  In view of the
complexity of the provisions of Section 302A.473,  shareholders of Video who are
considering  dissenting  from the Video Proposal  should consult their own legal
advisors.

         Knogo. It is a condition to the Merger that the Sentry Common Stock and
the Sentry Class A Preferred Stock be listed on NASDAQ, or a national securities
exchange.  If both such classes of Sentry stock are so listed,  holders of Knogo
Common Stock will not be entitled to appraisal  rights  because the Knogo Common
Stock also is listed on a national securities exchange.

         In the event that Knogo and Video  waive one or both of the  conditions
to the Merger  that the Sentry  Common  Stock and the Sentry  Class A  Preferred
Stock be listed on NASDAQ or a national securities exchange  (collectively,  the
"Listing Condition"), holders of record of Knogo Common Stock who do not vote in
favor of the  Knogo  Proposal  and who  otherwise  comply  with  the  applicable
statutory  procedures  summarized  herein will be entitled to  appraisal  rights
under  Section 262 of the DGCL  ("Section  262").  A person  having a beneficial
interest in shares of Knogo  Common  Stock held of record in the name of another
person,  such as a broker or  nominee,  must act  promptly  to cause the  record
holder to follow the steps  summarized  below properly and in a timely manner to
perfect appraisal rights.

         The  following  discussion  is not a  complete  statement  of  the  law
pertaining  to appraisal  rights under the DGCL and is qualified in its entirety
by the full text of Section 262 which is  reprinted  in its entirety as Appendix
E. All references in Section 262 and this summary to a "stockholder" or "holder"
are to the  record  holder  of the  shares  of  Knogo  Common  Stock as to which
appraisal rights are asserted.

         Under the DGCL, if the Listing  Condition is waived,  holders of shares
of Knogo Common Stock  ("Appraisal  Shares") who follow the procedures set forth
in Section 262 will be entitled to have their Appraisal  Shares appraised by the
Delaware  Chancery  Court and to receive  payment in cash of the "fair value" of
such  Appraisal  Shares,  exclusive  of any  element of value  arising  from the
accomplishment  or  expectation  of the  Merger,  together  with a fair  rate of
interest, if any, as determined by such court.

         Under  Section  262,  where a proposed  Merger is to be  submitted  for
approval at a meeting of stockholders,  the  corporation,  not less than 20 days
prior to the meeting,  must notify each of its  stockholders who was such on the
record date for such meeting with  respect to shares to which  appraisal  rights
are available,  that appraisal rights are so available, and must include in such
notice a copy of Section 262.

         This Joint Proxy  Statement/Prospectus  constitutes  such notice to the
holders of Appraisal Shares and the applicable  statutory provisions of the DGCL
are  attached  to this  Joint  Proxy  Statement/Prospectus  as  Appendix  E. Any
stockholder  who  wishes to  exercise  such  appraisal  rights or who  wishes to
preserve his right to do so should review the following  discussion and Appendix
E carefully,  because  failure to timely and properly comply with the procedures
specified will result in the loss of appraisal rights under the DGCL.

   
         A  holder  of  Appraisal  Shares  wishing  to  exercise  such  holder's
appraisal  rights (a) must not vote in favor of the Knogo  Proposal and (b) must
deliver to Knogo prior to the vote on the Knogo Proposal at the Knogo Meeting to
be held on  February  6,  1997,  a written  demand for such  holder's  Appraisal
Shares. A holder of Appraisal Shares wishing to exercise such holder's appraisal
rights  must be the  record  holder  of such  Appraisal  Shares  on the date the
written  demand for appraisal is made and must  continue to hold such  Appraisal
Shares of record until the consummation of the Merger.  Accordingly, a holder of
Appraisal  Shares who is the record  holder of Appraisal  Shares on the date the
written  demand  for  appraisal  is  made,  but who  thereafter  transfers  such
Appraisal Shares prior to the consummation of the Merger, will lose any right to
appraisal in respect of such Appraisal Shares.  If, as management  expects,  the
Listing Condition is satisfied, any demand so made will be of no effect.
    


                                       41
<PAGE>

         Only a holder of  record of  Appraisal  Shares  is  entitled  to assert
appraisal  rights for the Appraisal  Shares  registered in that holder's name. A
demand for appraisal should be executed by or on behalf of the holder of record,
fully and  correctly,  as such  holder's  name  appears on such  holder's  stock
certificates.  If the  Appraisal  Shares  are  owned of  record  in a  fiduciary
capacity, such as by a trustee,  guardian or custodian,  execution of the demand
should be made in that capacity, and if the Appraisal Shares are owned of record
by more than one person as in a joint  tenancy or tenancy in common,  the demand
should be executed by or on behalf of all joint  owners.  An  authorized  agent,
including one or more joint owners, may execute a demand for appraisal on behalf
of a holder of record;  however,  the agent must  identify  the record  owner or
owners and expressly  disclose the fact that, in executing the demand, the agent
is agent for such owner or owners.  A record  holder  such as a broker who holds
Appraisal Shares as nominee for several beneficial owners may exercise appraisal
rights with  respect to the  Appraisal  Shares  held for one or more  beneficial
owners while not  exercising  such rights with respect to the  Appraisal  Shares
held for other  beneficial  owners;  in such case, the written demand should set
forth the number of Appraisal  Shares as to which  appraisal is sought.  When no
number of Appraisal Shares is expressly mentioned the demand will be presumed to
cover all Appraisal  Shares held in the name of the record  owner.  Stockholders
who hold their Appraisal Shares in brokerage accounts or other nominee forms and
who wish to exercise appraisal rights are urged to consult with their brokers to
determine the appropriate procedures for the making of a demand for appraisal by
such a nominee.

         All written demands for appraisal  should be sent or delivered to Knogo
North  America  Inc.,  350  Wireless  Boulevard,   Hauppauge,  New  York  11788,
Attention: Secretary.

         Within 10 days after the  consummation  of the Merger,  but only if the
Listing  Condition has been waived,  Sentry will notify each stockholder who has
properly  asserted  rights  under  Section 262 and has not voted in favor of the
Knogo Proposal of the date the Merger became effective.

         Within  120  days  after  the  consummation  of  the  Merger,  but  not
thereafter  and only if the Listing  Condition  has been  waived,  Sentry or any
stockholder who has complied with the statutory  requirements  summarized  above
may file a petition in the Delaware  Chancery Court demanding a determination of
the fair value of the Appraisal Shares. Sentry is under no obligation to and has
no present  intention to file a petition  with  respect to the  appraisal of the
fair value of the Appraisal  Shares.  Accordingly,  it is the  obligation of the
stockholders to initiate all necessary  action to perfect their appraisal rights
within the time prescribed in Section 262.

         Within 120 days after the  consummation of the Merger,  but only if the
Listing  Condition has been waived,  any  stockholder  who has complied with the
requirements  for  exercise of appraisal  rights will be entitled,  upon written
request,  to receive from Sentry a statement  setting forth the aggregate number
of  Appraisal  Shares not voted in favor of adoption of the Knogo  Proposal  and
with respect to which demands for appraisal have been received and the aggregate
number of holders  of such  Appraisal  Shares.  Such  statements  must be mailed
within ten days after a written request therefor has been received by Sentry.

         If  the  Listing  Condition  has  been  waived  and a  petition  for an
appraisal  is timely  filed,  after a hearing  on such  petition,  the  Delaware
Chancery Court will determine the stockholders  entitled to appraisal rights and
will appraise the fair value of their Appraisal Shares, exclusive of any element
of value arising from the accomplishment or expectation of the Merger,  together
with a fair rate of interest,  if any, to be paid upon the amount  determined to
be the fair value.  Stockholders  considering  seeking appraisal should be aware
that the fair value of their  Appraisal  Shares as determined  under Section 262
could be more than, the same as or less than the value of the consideration they
would receive pursuant to the Merger Agreement if they did not seek appraisal of
their Appraisal Shares and that investment  banking opinions as to fairness from
a financial  point of view are not  necessarily  opinions as to fair value under
Section 262. The  Delaware  Supreme  Court has stated that proof of value by any
techniques or methods which are generally considered acceptable in the financial
community  and  otherwise  admissible  in  court  should  be  considered  in the
appraisal proceedings.

         The Delaware  Chancery Court will determine the amount of interest,  if
any,  to be paid upon the  amounts to be  received  by persons  whose  Appraisal
Shares have been  appraised.  The costs of the action may be  determined  by the
Delaware  Chancery  Court and taxed upon the  parties as the  Delaware  Chancery
Court deems equitable.  The Delaware Chancery Court may also order that all or a
portion of the  expenses  incurred  by any  stockholder  in  connection  with an
appraisal, including, without limitation, reasonable attorneys fees and the fees
and expenses of 


                                       42
<PAGE>

experts  utilized in the appraisal  proceeding,  be charged pro rata against the
value of all the Appraisal Shares entitled to appraisal.

         If the  Listing  Condition  has been  waived,  any holder of  Appraisal
Shares who had duly  demanded an appraisal in  compliance  with Section 262 will
not,  after the  consummation  of the Merger,  be entitled to vote the Appraisal
Shares  subject to such  demand for any purpose or be entitled to the payment of
dividends or other  distributions on those Appraisal Shares (except dividends or
other  distributions  payable to holders of record of  Appraisal  Shares as of a
record date prior to the consummation of the Merger).

         If any  stockholder  who properly  demands  appraisal of his  Appraisal
Shares under Section 262 fails to perfect,  or  effectively  withdraws or loses,
his right to  appraisal,  as provided in the DGCL the  Appraisal  Shares of such
stockholder  will be  converted  into the  right to  receive  the  consideration
receivable  with respect to such Appraisal  Shares in accordance with the Merger
Agreement.  A stockholder will fail to perfect, or effectively lose or withdraw,
his right to appraisal  if,  among other  things,  no petition for  appraisal is
filed  within  120  days  after  the  consummation  of  the  Merger,  or if  the
stockholder delivers to Sentry a written withdrawal of his demand for appraisal.
Any such  attempt to  withdraw an  appraisal  demand more than 60 days after the
consummation of the Merger will require the written approval of Sentry.

         Failure to follow the steps  required  by  Section  262 for  perfecting
appraisal  rights  may  result  in the loss of such  rights  (in  which  event a
stockholder  will be  entitled  to receive  the  consideration  receivable  with
respect to such Appraisal  Shares in accordance with the Merger  Agreement).  In
view of the complexity of the provisions of Section 262,  stockholders  of Knogo
who are considering  dissenting from the Knogo Proposal should consult their own
legal advisors.



                                       43
<PAGE>

                              THE MERGER AGREEMENT

         The  following is a brief  summary of certain  provisions of the Merger
Agreement,  a copy of  which is  attached  as  Appendix  A to this  Joint  Proxy
Statement/Prospectus  and is incorporated  herein by reference.  This summary is
qualified in its  entirety by  reference  to the full and  complete  text of the
Merger Agreement.

The Mergers

         Pursuant  to  the  Merger  Agreement  and  subject  to  the  terms  and
conditions  thereof,  Video Merger Corp.  and Knogo Merger Corp.  will be merged
with and into Video and Knogo,  respectively.  As a result of the Merger,  Video
and Knogo  will  become  wholly-owned  subsidiaries  of  Sentry.  As part of the
Merger, shareholders of Video and Knogo will receive the consideration described
below.

         Subject  to the terms  and  conditions  of the  Merger  Agreement,  the
closing of the transactions  contemplated thereby will take place as promptly as
practicable  following  the  satisfaction  or,  if  permissible,  waiver  of the
conditions  set forth in the Merger  Agreement  unless  another  date or time is
agreed to in writing by Video and Knogo  (such  date  referred  to herein as the
"Closing  Date").  The  merger of Video  Merger  Corp.  with and into Video will
become  effective  upon the filing of an articles of merger  (the  "Articles  of
Merger")  with the  Secretary of State of the State of  Minnesota in  accordance
with applicable provisions of the Minnesota Act, or at such later time as may be
specified  in the  Articles of Merger in  accordance  with  applicable  law. The
merger of Knogo Merger Corp. with and into Knogo will become  effective upon the
filing of a  certificate  of  merger  (the  "Certificate  of  Merger")  with the
Secretary  of State of the  State of  Delaware  in  accordance  with  applicable
provisions  of the  DGCL,  or at  such  later  time as may be  specified  in the
Certificate of Merger in accordance  with  applicable  law. Video and Knogo have
each agreed to use their best  efforts to ensure that the Video  Effective  Time
and the Knogo Effective Time will occur upon the same date and at the same time.

Conversion of Video Common Stock

         Upon  consummation  of  the  Video  Merger,   pursuant  to  the  Merger
Agreement,  (i) each share of Video Common Stock issued and  outstanding  at the
Video  Effective  Time will be converted into and represent the right to receive
one share of Sentry Common Stock,  (ii) upon such conversion all shares of Video
Common Stock will be canceled and cease to exist,  and (iii) each share of Video
Common  Stock held in Video's  treasury  will be canceled  and  retired  without
payment of any consideration therefor.

         HOLDERS  OF  VIDEO  COMMON  STOCK  SHOULD  NOT  SEND  ANY  CERTIFICATES
REPRESENTING VIDEO COMMON STOCK WITH THE ENCLOSED PROXY CARD. IF THE TRANSACTION
IS APPROVED,  INSTRUCTIONS  AND A LETTER OF TRANSMITTAL WILL BE MAILED AFTER THE
EFFECTIVE TIME TO EACH PERSON WHO WAS A HOLDER OF OUTSTANDING VIDEO COMMON STOCK
IMMEDIATELY  PRIOR TO THE VIDEO EFFECTIVE TIME. VIDEO  SHAREHOLDERS  SHOULD SEND
CERTIFICATES  REPRESENTING  VIDEO COMMON STOCK TO THE EXCHANGE  AGENT ONLY AFTER
THEY  RECEIVE,   AND  IN  ACCORDANCE   WITH,  THE  INSTRUCTIONS  AND  LETTER  OF
TRANSMITTAL.

         Video Stock Options. As provided in the Merger Agreement,  at the Video
Effective  Time,  all  outstanding  options and other  rights to acquire  shares
granted to employees under any stock option or purchase plan, program or similar
arrangement  of Video and,  with respect to  employees  and  non-employees,  all
outstanding  warrants to purchase  shares of Video Common Stock,  whether or not
such  options or warrants  are then  exercisable  or vested,  will be assumed by
Sentry and shall be exercisable  upon the same terms and conditions as under the
applicable  warrant or option,  except that (i) each such option or warrant will
be  exercisable  for that whole number of shares of Sentry  Common Stock (to the
nearest  share) into which the number of shares of Video Common Stock subject to
such  option  or  warrant  immediately  prior  to the  Effective  Time  would be
converted under the Merger Agreement,  (ii) the option exercise price or warrant
exercise  price per share of Sentry  Common Stock will be an amount equal to the
option exercise price or warrant  exercise price per share of Video Common Stock
in effect  immediately  prior to the Video  Effective  Time divided by the Video
Merger  Consideration (as defined in the Merger  Agreement)  (rounded upwards to
the nearest full cent). No payment will be made for fractional interests. Except
as provided in the Merger Agreement or as otherwise agreed to by the parties and
to the extent permitted by the option plans,


                                       44
<PAGE>

the option plans of Video will terminate as of the Video  Effective Time and any
rights under any provisions in any other plan, program or arrangement  providing
for the  issuance  or grant by Video of any  interest  in respect of the capital
stock of Video will be canceled. See "THE MERGER -- Interests of Certain Persons
in the Merger -- Video --Employee Stock Option Programs."

Conversion of Knogo Common Stock

         Upon  consummation  of  the  Knogo  Merger,   pursuant  to  the  Merger
Agreement,  (i) each 1.2022 shares of Knogo Common Stock issued and  outstanding
at the Knogo  Effective  Time will be converted  into and represent the right to
receive (a) one share of Sentry Common Stock and (b) one share of Sentry Class A
Preferred Stock, (ii) upon such conversion all shares of Knogo Common Stock will
be canceled and cease to exist,  and (iii) each share of Knogo Common Stock held
in  Knogo's  treasury  will be  canceled  and  retired  without  payment  of any
consideration therefor.

         HOLDERS  OF  KNOGO  COMMON  STOCK  SHOULD  NOT  SEND  ANY  CERTIFICATES
REPRESENTING KNOGO COMMON STOCK WITH THE ENCLOSED PROXY CARD. IF THE TRANSACTION
IS APPROVED,  INSTRUCTIONS  AND A LETTER OF TRANSMITTAL WILL BE MAILED AFTER THE
EFFECTIVE TIME TO EACH PERSON WHO WAS A HOLDER OF OUTSTANDING KNOGO COMMON STOCK
IMMEDIATELY  PRIOR TO THE KNOGO EFFECTIVE TIME. KNOGO  STOCKHOLDERS  SHOULD SEND
CERTIFICATES  REPRESENTING  KNOGO COMMON STOCK TO THE EXCHANGE  AGENT ONLY AFTER
THEY  RECEIVE,   AND  IN  ACCORDANCE   WITH,  THE  INSTRUCTIONS  AND  LETTER  OF
TRANSMITTAL.

         Knogo Stock Options. As provided in the Merger Agreement,  at the Knogo
Effective  Time,  all  outstanding  options and other  rights to acquire  shares
granted to employees under any stock option or purchase plan, program or similar
arrangement  of Knogo,  whether  or not such  options  are then  exercisable  or
vested,  will be assumed by Sentry, and shall be exercisable upon the same terms
and  conditions as under the applicable  option,  except that (A)(i) each option
will be  exercisable  for that whole number of shares of Sentry Common Stock (to
the nearest share) into which the number of shares of Knogo Common Stock subject
to such option  immediately prior to the Effective Time would be converted under
the Merger Agreement, (ii) each option will be exercisable for that whole number
of shares of Sentry  Class A Preferred  Stock (to the nearest  share) into which
the number of shares of Knogo  Common Stock  subject to such option  immediately
prior to the  Effective  Time would be  converted  under the  Merger  Agreement,
provided  that if all of the issued and  outstanding  Sentry  Class A  Preferred
Stock has been theretofore  redeemed or converted in the manner set forth in the
Sentry  Certificate  of  Incorporation,  then  in  lieu  of the  Sentry  Class A
Preferred Stock, the holders of such options will receive the same consideration
paid to the holders of Sentry Class A Preferred  Stock upon such  redemption  or
conversion and (iii) all such options shall vest at the Effective  Time, and (B)
the option  exercise  price per share of Sentry Common Stock  (including  Sentry
Class A Preferred  Stock) will be an amount equal to the option  exercise  price
per share of Knogo  Common Stock of such option in effect  immediately  prior to
the Knogo  Effective  Time divided by the Knogo Common Stock  Consideration  (as
defined in the Merger Agreement)  (rounded upwards to the nearest full cent). No
payment will be made for fractional interests.  Except as provided in the Merger
Agreement or as otherwise agreed to by the parties,  and to the extent permitted
by the option  plans,  the option plans of Knogo will  terminate as of the Knogo
Effective Time and any rights under any provisions in any other plan, program or
arrangement  providing  for the  issuance  or grant by Knogo of any  interest in
respect of the  capital  stock of Knogo  will be  canceled.  See "THE  MERGER --
Interests  of Certain  Persons in the Merger -- Knogo -- Employee  Stock  Option
Programs."

Exchange Procedure

         As  of  the  Effective   Time,   Sentry  shall   deposit   certificates
representing  the shares of Sentry  Common  Stock and Sentry  Class A  Preferred
Stock with the  Exchange  Agent for the benefit of the  holders of Video  Common
Stock and Knogo  Common  Stock,  for  exchange  in  accordance  with the  Merger
Agreement.  Promptly  after the  Effective  Time,  instructions  and a letter of
transmittal  will be mailed to each  person  who was a holder of an  outstanding
share of Video Common Stock immediately prior to the Video Effective Time and to
each  person  who was a holder of an  outstanding  share of Knogo  Common  Stock
immediately prior to the Knogo Effective Time.

         Dividends.  No  dividends  or other  distributions  declared  on Sentry
Common Stock or Sentry Class A Preferred  Stock after the Effective Time will be
paid with respect to any shares of Video Common Stock or Knogo


                                       45
<PAGE>

Common  Stock   represented  by  a  Video  Common  Stock   certificate   ("Video
Certificate") or Knogo Common Stock  certificate  ("Knogo  Certificate"),  until
such  Video  Certificate  or  Knogo  Certificate  is  surrendered  for  exchange
according to the procedures  described above and in the Merger Agreement and the
letter of transmittal.

         Fractional  Shares.  No  fractional  shares of Sentry  Common  Stock or
Sentry  Class A Preferred  Stock will be issued  pursuant to the Video Merger or
the Knogo  Merger.  Each record  holder of shares of Video Common Stock or Knogo
Common  Stock  exchanged  pursuant to the Merger who would  otherwise  have been
entitled to receive a fraction of a share of Sentry  Common Stock and/or  Sentry
Class A  Preferred  Stock,  as the case may be (after  taking  into  account all
shares of Video Common Stock or Knogo  Common Stock  delivered by such  holder),
shall receive,  in lieu thereof, a cash payment (without interest)  representing
such record holder's proportionate interest in the net proceeds from the sale by
the Exchange  Agent  (following  the deduction of applicable  transaction  costs
other than of the Exchange Agent,  Video, Knogo or Sentry),  for the accounts of
all such record  holders,  of the shares of Sentry  Common Stock  and/or  Sentry
Class Preferred Stock, as the case may be, representing all such fractions. Such
sale shall be made as soon as practicable after the Effective Time.

         Adjustment of Merger  Consideration.  In the event that, (i) subsequent
to the date of the Merger  Agreement but prior to the Video  Effective Time, the
outstanding  shares of Video shall have been changed into a different  number of
shares or a different  claim as a result of a stock split,  reverse stock split,
stock dividend,  subdivision,  reclassification,  split, combination,  exchange,
recapitalization or other similar transaction, or (ii) subsequent to the date of
the Merger  Agreement but prior to the Knogo  Effective  Time,  the  outstanding
shares of Knogo shall have been changed  into a different  number of shares or a
different  claim  as a result  of a stock  split,  reverse  stock  split,  stock
dividend,   subdivision,   reclassification,   split,   combination,   exchange,
recapitalization  or other similar  transaction,  then the merger  consideration
shall be appropriately adjusted.

Certain Representations and Warranties

         The Merger Agreement contains customary  representations and warranties
by both  Video  and  Knogo as to,  among  other  things:  (i) due  organization,
corporate  power  and  good  standing;  (ii)  authorized  capital  stock;  (iii)
ownership of subsidiaries;  (iv) lack of certain  investments or interests;  (v)
the lack of voting trusts and shareholder  agreements;  (vi) authority and power
to execute  the Merger  Agreement;  (vii) the  absence of  governmental  consent
requirements;  (viii)  approval by the respective  Boards of the  Support/Voting
Agreements; (ix) the compliance of the Merger with charters, bylaws and the law;
(x) the absence of certain material  defaults or violations;  (xi) the filing of
certain  documents  with  the  Commission;   (xii)  the  accuracy  of  financial
statements;  (xiii)  the  absence of untrue  statements  of  material  facts and
inclusion  of  material  facts  in  the  Joint  Proxy  Statement/Prospectus  and
Registration  Statement;  (xiv)  compliance  with all laws;  (xv) the absence of
material  changes  or  events;   (xvi)  the  absence  of  material   undisclosed
liabilities;  (xvii) the absence of certain  litigation;  (xviii) the absence of
material liabilities related to employee benefit plans; (xix) tax matters;  (xx)
the  ownership of  intellectual  property;  (xxi) the absence of material  labor
disputes;  (xxii) brokerage and finder's fees; (xxiii) fairness opinions; (xxiv)
Code  Section  351/reorganization  tax  treatment;  (xxv) lack of  ownership  of
shares; and (xxvi) formation of the Merger subsidiaries.

Certain Covenants

         Conduct of Business Pending the Reorganization.  Pursuant to the Merger
Agreement, Video and Knogo have made various customary covenants relating to the
Merger.  Knogo and Video have agreed that,  prior to the Effective Time,  Knogo,
Video,  and  their  significant   subsidiaries  will  conduct  their  operations
according to their usual, regular and ordinary course of business.

         Access; Confidentiality. Knogo and Video have agreed: (i) from the date
of the Merger  Agreement until the Effective Time, to give one another and their
respective  authorized  representatives  reasonable  access to their  respective
executive officers,  properties,  books and records,  and to furnish one another
and  their  respective  authorized   representatives  with  such  financial  and
operating data and other information concerning the businesses and properties of
Video and Knogo as they may from time to time reasonably request;  and (ii) that
each of Video,  Sentry,  Video Merger Corp.,  Knogo Merger Corp.  and Knogo will
hold and treat all documents and information concerning each entity furnished to
one  another in  connection  with the  transactions  contemplated  by the Merger
Agreement  confidential in accordance with the Confidentiality  Agreements dated
July 11, 1996 and September 6, 1996, between Knogo and Video.


                                       46
<PAGE>

         Meetings of Stockholders. Knogo and Video have agreed that: (i) each of
Video and Knogo  will take all  action  necessary  to convene a meeting of their
respective stockholders as promptly as practicable to consider and vote upon the
approval of the Merger Agreement and the transactions contemplated thereby; (ii)
the Board of Directors of each of Video and Knogo shall  recommend such approval
and each shall  take all lawful  action to  solicit  such  approval,  including,
without limitation, timely mailing of the Joint Proxy Statement/Prospectus;  and
(iii) Video, as sole stockholder of Sentry,  and Sentry,  as sole stockholder of
Video Merger Corp. and Knogo Merger Corp., shall as promptly as practicable duly
approve the Merger Agreement and the transactions contemplated thereby.

         Reasonable  Efforts.  Knogo  and  Video  have  agreed  that each of the
parties shall act in good faith and use commercially reasonable efforts to take,
or cause to be taken,  all actions,  and to do, or cause to be done,  all things
necessary, proper or advisable to consummate and make effective the transactions
contemplated  by the Merger  Agreement as soon as  practicable,  including  such
actions or things as any other  party may  reasonably  request in order to cause
any of the  conditions  to such  other  party's  obligation  to  consummate  the
transactions contemplated by the Merger Agreement to be fully satisfied. Without
limiting the foregoing,  the parties have agreed to consult and fully  cooperate
with and provide assistance to each other in the preparation and filing with the
Commission of the Joint Proxy Statement/Prospectus, and any necessary amendments
or supplements thereto and seeking to have the Joint Proxy  Statement/Prospectus
cleared by the Commission as soon as reasonably practicable after filing.

         Public  Announcements.  Knogo and Video have agreed that Knogo,  Video,
Sentry,  Video Merger Corp. and Knogo Merger Corp. will consult with one another
prior to issuing any releases or  otherwise  making any public  statements  with
respect to the  transactions  contemplated in the Merger Agreement and shall not
issue  any such  press  releases  or make any  public  statements  prior to such
consultation,  except  as may  be  required  by  applicable  law or any  listing
agreement with a national securities exchange by which such party is bound.

         Merger  Proposals.   Knogo  and  Video  have  agreed  that,  except  as
contemplated  in the  Merger  Agreement,  each of Knogo and Video  will not (and
shall use reasonable efforts to cause its officers,  directors and employees and
any investment banker, attorney,  accountant,  or other agent retained by it not
to)  solicit  any  Merger  Proposal  (and,  any  such  transaction,   a  "Merger
Transaction")  or provide any non-public  information  concerning the respective
company to any third party in connection with a Merger Proposal.  However, Knogo
and Video may furnish  information or cause  information to be furnished to, and
may  participate  in  discussions  and  negotiations  directly or through  their
respective  representatives  and enter into an  agreement  relating  to a Merger
Proposal with, any third party who makes an unsolicited proposal or offer to it,
if the Knogo Board or Video Board determines in good faith,  after  consultation
with outside counsel,  that the failure to consider such proposal or offer could
reasonably  be deemed to cause its  directors to breach their  fiduciary  duties
under  applicable law. In addition,  nothing  contained in the Merger  Agreement
prohibits Knogo or Video and their respective directors from (i) issuing a press
release or otherwise publicly disclosing the terms of any Merger Proposal,  (ii)
taking and  disclosing  to its  stockholders  any position,  and making  related
filings  with the  Commission,  as  required  by Rules 14e-2 and 14d-9 under the
Exchange  Act with  respect to any tender  offer or (iii)  taking any action and
making any disclosure to its  stockholders  which the Knogo Board or Video Board
determines in good faith, after consultation with outside counsel,  would likely
be  required  to be taken  or made  under  applicable  law  (including,  without
limitation,  laws relating to the fiduciary  duties of directors).  In the event
Knogo or Video  receives a Merger  Proposal,  each party has agreed to  promptly
inform the other  party as to the receipt of such  Merger  Proposal,  unless the
Knogo Board or Video Board determines,  after consultation with outside counsel,
that giving such notice  could  reasonably  be deemed to cause its  directors to
breach their fiduciary duties under applicable law.

         Registration Statement and Joint Proxy Statement/Prospectus.  Knogo and
Video  have  agreed  that:  (i) Knogo  and  Video  shall  promptly  furnish  all
information as may be required for inclusion in the Registration Statement; (ii)
Video and Knogo shall cooperate and promptly prepare,  and Video shall file with
the Commission as soon as practicable,  the Registration Statement;  (iii) Video
shall use reasonable  efforts,  and Knogo will cooperate with Video, to have the
Registration  Statement  declared  effective  by the  Commission  as promptly as
practicable;  (iv) Video shall use  reasonable  efforts to obtain,  prior to the
effective date of the Registration Statement, all necessary state securities law
or "blue sky"  permits or  approvals  required to  consummate  the  transactions
contemplated by the Merger Agreement;  (v) if at any time prior to the Effective
Time, any information  pertaining to Knogo or Video contained in or omitted from
the Registration Statement makes such information false or misleading, Knogo and
Video shall  promptly  inform the other party and provide  such other party with
information  necessary to make the statements  contained therein not misleading;
and (vi) no amendment or supplement to the Joint Proxy Statement/Prospectus will
be made by Video or Knogo without the approval of the other party.



                                       47
<PAGE>

         Listing  Application.  Knogo and Video have  agreed  that  Video  shall
promptly  prepare  and submit to  NASDAQ,  or a  national  securities  exchange,
listing applications covering the shares of Sentry Common Stock and Sentry Class
A Preferred  Stock  issuable in the  Merger,  and shall use its best  efforts to
obtain,  prior to the  Effective  Time,  approval for the listing of such stock,
subject to official notice of issuance.

         Affiliate  Letters.  Knogo and Video have agreed that:  (i) at least 30
days prior to the Closing  Date,  Knogo and Video shall  deliver to each other a
list of names and  addresses  of those  persons  who were,  in their  respective
reasonable judgments, at the record date for the Knogo Meeting or Video Meeting,
as the case may be,  "affiliates" of either Knogo or Video (each such person,  a
"Knogo Affiliate" or "Video Affiliate," respectively) within the meaning of Rule
145 of the rules and regulations promulgated under the Act; (ii) Knogo and Video
shall  provide  each other with such  information  and  documents  as each shall
reasonably  request for purposes of reviewing  such list;  (iii) Knogo and Video
shall use reasonable  efforts to deliver or cause to be delivered to each other,
prior  to the  Closing  Date,  from  each  of the  Knogo  Affiliates  and  Video
Affiliates,  as the case may be,  identified in the foregoing list, an Affiliate
Letter (in the form attached to the Merger Agreement);  and (iv) Sentry shall be
entitled  to  place  legends  as  specified  in such  Affiliate  Letters  on the
certificates  evidencing  any Sentry  Common  Stock to be received by such Knogo
Affiliates and Video  Affiliates,  as the case may be,  pursuant to the terms of
the Merger Agreement, and to issue appropriate stop transfer instructions to the
transfer  agent for the Sentry Common Stock,  consistent  with the terms of such
Affiliate Letters.

         D&O  Indemnification  and Insurance.  Knogo and Video have agreed that:
(a) from the Effective  Time through the later of (i) the sixth  anniversary  of
the date on which the  Effective  Time  occurs  and (ii) the  expiration  of any
statute of  limitations  applicable to any claim,  action,  suit,  proceeding or
investigation  referred  to  below,  Sentry  shall,  or shall  cause  the  Video
Surviving  Corporation (as defined in the Merger  Agreement) and Knogo Surviving
Corporation (as defined in the Merger Agreement) to, indemnify and hold harmless
each present and former officer, director, employee or agent of Knogo, Video and
Sentry,  including,  without  limitation,  each  person  controlling  any of the
foregoing  persons  (the  "Indemnified  Parties"),  against all claims,  losses,
liabilities,  damages,  judgments,  fines,  fees, costs or expenses,  including,
without limitation,  attorneys' fees and disbursements (collectively,  "Costs"),
incurred  in   connection   with  any  claim,   action,   suit,   proceeding  or
investigation, whether civil, criminal, administrative or investigative, arising
out of or  pertaining  to  matters  existing  or  occurring  at or  prior to the
Effective Time  (including,  without  limitation,  the Merger  Agreement and the
transactions  and actions  contemplated  thereby),  whether  asserted or claimed
prior to, at or after the Effective Time, to the fullest extent  permitted under
applicable law and the Certificate of  Incorporation,  as amended,  or Bylaws of
Knogo  or  indemnification  agreements  in  effect  on the  date  of the  Merger
Agreement,  including provisions relating to advancement of expenses incurred in
the defense of any claim,  action,  suit,  proceeding or investigation.  Without
limiting the foregoing, in the event that any claim, action, suit, proceeding or
investigation is brought against an Indemnified Party (whether arising before or
after the Effective Time), the Indemnified Party may retain counsel satisfactory
to such Indemnified  Party, and Sentry shall, or shall cause the Video Surviving
Corporation and Knogo Surviving Corporation to, advance the fees and expenses of
such counsel for the  Indemnified  Party in accordance  with the  Certificate of
Incorporation,  as  amended,  or  Bylaws  of Knogo in  effect on the date of the
Merger  Agreement;  (b)  Sentry  shall,  or  shall  cause  the  Video  Surviving
Corporation  and  Knogo  Surviving  Corporation,   to  keep  in  effect  in  its
Certificate  of  Incorporation  and Bylaws,  provisions  of Knogo  providing for
exculpation  of director and officer  liability and its  indemnification  of the
Indemnified  Parties  to the  fullest  extent  permitted  under the DGCL,  which
provisions  shall not be amended  except as required by applicable law or except
to make changes  permitted by law that would  enlarge the  Indemnified  Parties'
right to  indemnification;  (c) Sentry shall maintain,  or shall cause the Video
Surviving Corporation and Knogo Surviving Corporation to maintain,  with respect
to matters  occurring at, prior to or  subsequent  to the Effective  Time, at no
expense to the  beneficiaries,  directors'  and officers',  liability  insurance
("D&O Insurance") for the Indemnified  Parties,  issued by a carrier or carriers
assigned a claims-paying ability rating by A.M. Best & Co. of "A (Excellent)" or
higher,  providing  at least the same  coverage as the D&O  Insurance  currently
maintained  by Knogo  and  containing  terms  and  conditions  which are no less
favorable  to the  beneficiaries,  for a period of at least  six years  from the
Effective  Time.  In the  event  any  claim is made  against  present  or former
directors,  officers  or  employees  of  Knogo  or  Video  that  is  covered  or
potentially   covered  by  insurance,   neither  Sentry,   the  Video  Surviving
Corporation  nor the Knogo  Surviving  Corporation  shall do anything that would
forfeit, jeopardize, restrict or limit the insurance coverage available for that
claim until the final disposition thereof;  (d) notwithstanding  anything stated
in the Merger Agreement to the contrary, if any claim, action, suit,



                                       48
<PAGE>

proceeding or investigation  (whether arising before,  at or after the Effective
Time)  is  made  against  any  Indemnified  Party,  on or  prior  to  the  sixth
anniversary of the Effective  Time, the provisions  concerning D&O Insurance and
indemnification  shall  continue in effect until the final  disposition  of such
claim,  action, suit,  proceeding or investigation;  (e) the covenant concerning
D&O  Insurance  and  indemnification  is  intended to be for the benefit of, and
shall be enforceable  by, each of the Indemnified  Parties and their  respective
heirs and legal representatives.  The indemnification provided for in the Merger
Agreement  shall  not be  deemed  exclusive  of any  other  rights  to  which an
Indemnified  Party is entitled,  whether pursuant to law, contract or otherwise.
Sentry shall pay all expenses,  including  attorneys' fees, that may be incurred
by any  Indemnified  Party in  enforcing  the  indemnity  and other  obligations
provided for in the covenant concerning D&O Insurance and  indemnification;  (f)
in the  event  that  Sentry  or the  Video  Surviving  Corporation  or the Knogo
Surviving  Corporation  or any of their  respective  successor  or  assigns  (1)
consolidates  with  or  merges  into  any  other  person  and  shall  not be the
continuing or surviving corporation or entity of such consolidation or merger or
(2) transfers or conveys all or  substantially  all of its properties and assets
to any  person,  then,  and in  each  such  case,  to the  extent  necessary  to
effectuate   the  purposes  of  the  covenant   concerning   D&O  Insurance  and
indemnification,  proper  provision  shall  be made so that the  successors  and
assigns  of Sentry or the Video  Surviving  Corporation  or the Knogo  Surviving
Corporation  shall succeed to the obligations set forth in the covenant and none
of the actions  described  in clauses (1) or (2) above shall be taken until such
provision is made.

         Employee Benefits. Knogo and Video have agreed that: (a) from and after
the  Effective  Time,  Sentry,  the Video  Surviving  Corporation  and the Knogo
Surviving  Corporation and their respective  affiliates will honor in accordance
with their  terms all  existing  employment,  severance,  consulting  and salary
continuation  agreements  (i)  between  Knogo and any of its  current  or former
officers, directors, employees or consultants, and (ii) between Video and any of
its current or former officers, directors,  employees or consultants; (b) Sentry
agrees that, for a three year period after the Effective Time, it shall provide,
or  shall  cause  the  Video  Surviving  Corporation  and  the  Knogo  Surviving
Corporation  to provide,  those persons who, prior to the Effective  Time,  were
employees  of Knogo  ("Knogo  Employees")  or  Video  ("Video  Employees")  with
employee plans and programs which provide benefits that are no less favorable in
the  aggregate  to those  provided to other  employees  of Sentry of  comparable
status and seniority. With respect to such benefits, past service,  compensation
and  expense  credits  of such  Knogo  Employees  and Video  Employees  shall be
recognized  for all purposes  under such plans  (including,  but not limited to,
participation,  eligibility vesting and calculation benefits), and each employee
or  fringe  benefit  plan or  program  available  to  Knogo  Employees  or Video
Employees as contemplated in the Merger Agreement shall be applied to such Knogo
Employees and Video Employees, respectively; and (c) in the event that Sentry or
the Video  Surviving  Corporation or the Knogo  Surviving  Corporation or any of
their respective  successors or assigns (i) consolidates with or merges into any
other person and shall not be the continuing or surviving  corporation or entity
of  such   consolidation   or  merger  or  (ii)  transfers  or  conveys  all  or
substantially all of its properties and assets to any person,  then, and in each
such case, to the extent  necessary to  effectuate  the purposes of the covenant
concerning  employee  benefits,  proper  provision  shall  be made  so that  the
successors  and  assigns of Sentry or the Video  Surviving  Corporation  and the
Knogo Surviving  Corporation  shall succeed to the obligations set forth in that
section and none of the actions  described in clauses (i) or (ii) above shall be
taken until such provision is made.

         Expenses.  Knogo and Video have  agreed  that  whether or not the Video
Merger or the Knogo Merger is  consummated,  all costs and expenses  incurred in
connection  with the Merger  Agreement and the  transactions  contemplated in it
(including,  without  limitation,  fees and disbursements of counsel,  financial
advisors and accountants)  shall be borne by the party which incurs such cost or
expense.  However,  if  the  Merger  Agreement  is  terminated  pursuant  to the
provisions  regarding  termination  as a  result  of the  willful  and  material
misrepresentation  by a party or the willful and  material  breach by a party of
any of its covenants or  arrangements  set forth in the Merger  Agreement,  such
party shall pay the costs and expenses incurred by the other party in connection
with the Merger  Agreement.  Furthermore,  all costs and expenses related to the
preparation,    printing,    filing   and    mailing   of   the   Joint    Proxy
Statement/Prospectus  and all Commission filing fees incurred in connection with
the Joint Proxy Statement/Prospectus shall be borne equally by Knogo and Video.

         Cancellation of Sentry Common Stock.  Knogo and Video have agreed that,
as of the  Effective  Time,  all  authorized  Sentry  Common  Stock  issued  and
outstanding  immediately  prior to the  Effective  Time shall  automatically  be
canceled and extinguished and shall cease to exist.


                                       49
<PAGE>

Closing Conditions

         Conditions to Obligations  of Each Party to Effect the  Reorganization.
The  obligations of Video and Knogo to effect the Merger are  conditioned on the
fulfillment of the following:  (i) stockholder approval;  (ii) the absence of an
injunction prohibiting,  enjoining, or otherwise restraining consummation of the
Mergers;  (iii) the  effectiveness of the Registration  Statement;  and (iv) the
approval of Sentry Common Stock and Sentry Class A Preferred  Stock to be issued
to Video  shareholders  and Knogo  stockholders,  as applicable,  for listing on
NASDAQ or a national securities exchange.

         Conditions  Precedent to the  Obligations  of Knogo.  The obligation of
Knogo to effect the Knogo Merger is also subject to the satisfaction at or prior
to the Effective  Time of each of the following  additional  conditions,  unless
waived by Knogo: (i) the accuracy of all  representations and warranties made by
Video, Sentry, Video Merger Corp. and Knogo Merger Corp.; (ii) the compliance by
each of Video,  Sentry,  Video  Merger Corp.  and Knogo  Merger  Corp.  with all
obligations  and  agreements,  and covenants  contained in the Merger  Agreement
prior to the Effective  Time;  (iii)  Knogo's  receipt of such  certificates  of
Video,  Sentry,  Video Merger Corp.  and Knogo Merger  Corp.,  dated the Closing
Date,  signed by an executive officer of Video,  Sentry,  Video Merger Corp. and
Knogo  Merger  Corp.  to  evidence  satisfaction  of the  conditions  set  forth
concerning  conditions  of closing;  and (iv) Knogo's  receipt of the opinion of
Stroock & Stroock & Lavan,  counsel to Knogo,  based upon  reasonably  requested
representation  letters and dated the Closing Date, to the effect that the Knogo
Merger will be treated for federal income tax purposes as a transfer of property
to Sentry by holders of Knogo Common Stock governed by Section 351 of the Code.

         Conditions  Precedent to the Obligations of Video, Sentry, Video Merger
Corp. and Knogo Merger Corp. The obligation of Video, Sentry, Video Merger Corp.
and Knogo Merger Corp. to effect the Merger is also subject to the  satisfaction
at or  prior  to  the  Effective  Time  of  each  of  the  following  additional
conditions,  unless waived by Video: (i) the accuracy of all representations and
warranties made by Knogo;  (ii) the compliance by Knogo with all obligations and
agreements,  and  covenants  contained  in the  Merger  Agreement  prior  to the
Effective Time;  (iii) Video's receipt of such  certificate of Knogo,  dated the
Closing Date, signed by an executive  officer of Knogo to evidence  satisfaction
of the conditions set forth concerning  conditions of closing;  and (iv) Video's
receipt of the opinion of Dewey Ballantine, special counsel to Video, based upon
reasonably requested  representation  letters and dated the Closing Date, to the
effect that the Video Merger will be treated for federal  income tax purposes as
a reorganization described in Section 368(a) of the code and/or as a transfer of
property  to Sentry by  holders  of shares of Video  Common  Stock  governed  by
Section 351 of the Code.

Termination

         Termination.  Knogo and Video have agreed that the Merger Agreement may
be  terminated  and the Merger  may be  abandoned  at any time  (notwithstanding
approval of the Knogo Merger by the  stockholders  of Knogo and the Video Merger
by the  shareholders of Video, if required by applicable  provisions of the DGCL
and the Minnesota  Act),  prior to the  Effective  Time:  (a) by mutual  written
consent of Knogo and Video;  (b) by either Knogo or Video, if the Effective Time
shall  not have  occurred  on or  before  180 days  from the date of the  Merger
Agreement,  provided that the right to terminate the Merger Agreement under this
clause (b) shall not be  available to any party whose  misrepresentation  in the
Merger Agreement or whose failure to perform any of its covenants and agreements
or to satisfy any obligation under the Merger Agreement has been the cause of or
resulted in the  failure of the Merger to occur on or before  such date;  (c) by
either  Knogo or Video,  if (i) any  court of  competent  jurisdiction  or other
governmental  or  regulatory  body shall have issued any  judgment,  injunction,
order or decree prohibiting, enjoining or otherwise restraining the transactions
contemplated  by the Merger  Agreement and such judgment,  injunction,  order or
decree  shall have  become  final and  nonappealable  (provided,  that the party
seeking to terminate the Merger Agreement pursuant to this clause (c) shall have
used commercially reasonable efforts to remove such judgment,  injunction, order
or decree) or (ii) any statute,  rule, regulation or executive order promulgated
or enacted by any governmental  authority after the date of the Merger Agreement
which prohibits the consummation of the Merger shall be in effect; (d) by either
Knogo or Video,  if the Merger  Agreement  is not adopted or the Video Merger or
the  Knogo  Merger  is  not  approved  by  the  shareholders  of  Video  or  the
stockholders of Knogo as required in the Merger  Agreement;  (e) by either Knogo
or Video,  if there  shall  have been a material  breach of any  representation,
warranty or material  covenant or agreement  on the part of the other,  which is
not cured after thirty (30) days' written notice by the breaching company to the
other;  (f) by either Video or Knogo,  if (i) the Knogo Board shall  withdraw or
modify in a manner adverse to Video its approval or  recommendation of the Knogo
Merger 


                                       50
<PAGE>

or shall have  resolved  to do any of the  foregoing  pursuant  to the  covenant
concerning  Merger  Proposals or (ii) any person or group of persons  shall have
made a Merger  Proposal  that the Knogo Board  determines  in good faith,  after
consultation  with  outside  counsel,  that the  failure to accept  such  Merger
Proposal  could  reasonably be deemed to cause the members of the Knogo Board to
breach their fiduciary  duties under  applicable law; and (g) by either Knogo or
Video,  if (i) the Video Board shall  withdraw or modify in a manner  adverse to
Knogo its approval or  recommendation of the Video Merger or shall have resolved
to do any of the foregoing pursuant to the covenant  concerning Merger Proposals
or (ii) any person or group of persons  shall have made a Merger  Proposal  that
the Video  Board  determines  in good faith,  after  consultation  with  outside
counsel,  that the failure to accept such Merger  Proposal  could  reasonably be
deemed to cause the members of the Video Board to breach their fiduciary  duties
under applicable law.

         Termination  Fee.  Knogo and Video  have  agreed  that,  provided  that
neither Video,  Sentry,  Video Merger Corp.  nor Knogo Merger Corp.  shall be in
breach of their respective  obligations under the Merger  Agreement,  if (a) the
Knogo Board shall  withdraw or modify in a manner  adverse to Video its approval
or  recommendation  of the Knogo Merger or shall have  resolved to do any of the
foregoing pursuant to the covenant  concerning Merger Proposals and (b) Video or
Knogo shall have terminated the Merger Agreement by its Board either withdrawing
its  approval of the Merger or accepting a Merger  Proposal,  and (c) within six
months  of  any  such  termination,   Knogo  shall  have  consummated  a  Merger
Transaction,  then Knogo will pay, or reimburse  Video for, all reasonable  fees
and expenses  incurred by Video and its affiliates in connection with the Merger
and the consummation of the transactions  contemplated by the Merger  Agreement,
in an amount not to exceed $750,000 in the aggregate,  in addition to the amount
otherwise  payable  pursuant to the above proviso  concerning  related costs and
expenses.  Similarly,  provided  that  Knogo  shall  not  be in  breach  of  its
obligations under the Merger Agreement, if (a) the Video Board shall withdraw or
modify in a manner adverse to Knogo its approval or  recommendation of the Video
Merger  or  shall  have  resolved  to do any of the  foregoing  pursuant  to the
covenant  concerning  Merger  Proposals  and  (b)  Knogo  or  Video  shall  have
terminated the Merger Agreement by its Board either  withdrawing its approval of
the Merger or  accepting  an  alternative  Merger  Proposal,  and (c) within six
months  of  any  such  termination,   Video  shall  have  consummated  a  Merger
Transaction,  then Video will pay, or reimburse  Knogo for, all reasonable  fees
and expenses  incurred by Knogo and its affiliates in connection with the Merger
and the consummation of the transactions  contemplated by the Merger  Agreement,
in an amount not to exceed $750,000 in the aggregate,  in addition to the amount
otherwise  payable  pursuant to the above proviso  concerning  related costs and
expenses.


                                       51
<PAGE>

                                BUSINESS OF VIDEO

General

   
         Video  designs, manufactures,   markets  and  installs  a  programmable
traveling  CCTV system that  delivers a high quality video picture which is used
in a wide variety of applications. This proprietary system, called SentryVision,
is  well  suited  for  loss   prevention   surveillance  in  retail  stores  and
distribution  centers and security  surveillance  for  monitoring  and deterring
illegal and unsafe  activities in a variety of other  locations  such as parking
garages,  correctional  facilities and public transit terminals.  Video's system
may also be  employed  in a broad range of  operational  and process  monitoring
applications  in  commercial   manufacturing  and  industrial  settings.  As  of
September  30, 1996,  Video's  system had been  installed in  approximately  250
customer  locations  nationwide.  Current customers include Lowe's Home Centers,
Target Stores,  Eckerd Corporation,  Mills Fleet Farm, Estee Lauder and TJ Maxx.
Video believes that by expanding  surveillance coverage its systems have enabled
customers to  significantly  reduce  inventory  shrinkage,  increase  shoplifter
apprehension rates and improve merchandising flexibility.  Based on the price of
its system and the  experience  of its  customers  to date,  Video  believes its
system is a  cost-effective  loss  prevention  solution  which can  improve  the
profitability of its customers.
    

         Management  believes  that  Video's  SentryVision  system  is the  only
proven,  commercially accepted,  traveling CCTV system currently available.  The
SentryVision  system  consists of two CCTV cameras  mounted on a camera carriage
assembly designed to move horizontally  through a tinted enclosure that conceals
the camera's location. The system's unique,  cable-free design allows the camera
to move freely and rapidly through the enclosure while transmitting a continuous
video signal to provide  increased  surveillance  coverage.  Video  believes the
major  advantage  of  its  traveling   surveillance   system  over  conventional
fixed-mount or PTZ dome surveillance  cameras is the system's ability to provide
uninterrupted  security  monitoring and  surveillance  over large areas and over
areas which have numerous visual obstructions, often at a lower system cost. The
SentryVision   system  permits  the  monitoring  of  activities  in  areas  that
traditionally  have been  difficult  to monitor,  such as aisles  with  overhead
signs, hidden corridors, areas between vehicles, and other obstructed areas. The
system is configured to meet each customer's specific  surveillance needs and is
often integrated with the customer's existing peripheral surveillance equipment.

Business Strategy

         Video's   strategy  is  to  provide  its  customers   with   innovative
surveillance   solutions  through  the  application  of  high  quality  products
supported by outstanding  customer service. To continue its growth,  Video plans
to:

         o        Increase  Penetration  of the Domestic  Retail  Sector.  Video
                  plans to  continue  its focus on  increasing  sales to new and
                  existing customers in the domestic retail market sector. Video
                  believes it has  established  itself as an emerging leader for
                  innovative  loss  prevention  surveillance  systems  in retail
                  stores and distribution centers.  Video expects that increased
                  direct sales  resources  and positive  reports from  customers
                  regarding  reductions in inventory  shrinkage achieved through
                  the  use of the  SentryVision  system  will  enable  Video  to
                  continue  to expand  its share of the retail  loss  prevention
                  market.

         o        Establish  International  Marketing  and  Distribution.  Video
                  believes the  international  market for surveillance  products
                  presents a  significant  opportunity  for growth.  In order to
                  capitalize on this opportunity,  Video is currently evaluating
                  distribution  channels  to  facilitate  sales of its  products
                  abroad.

         o        Leverage Installed Base. Video intends to leverage its growing
                  base of  installed  systems and increase  customer  loyalty by
                  introducing new products and enhancements which are compatible
                  with  the   SentryVision   system   and   provide   additional
                  surveillance   capabilities.   For  example,   Video  recently
                  developed a point of sale  ("POS")  surveillance  system which
                  uses  information  from a retailer's cash register  systems to
                  control cashier surveillance by the SentryVision system.

         o        Pursue Opportunities in Additional Surveillance Markets. Video
                  believes that its traveling CCTV system provides  surveillance
                  capabilities which are superior to traditional  fixed-mount or
                  PTZ dome systems and can be used effectively in a wide variety
                  of applications. Examples of such


                                       52
<PAGE>

                  additional   markets  include   operational   surveillance  in
                  industrial,  retail  and  correctional  facilities;   security
                  surveillance in airports,  subways,  bus terminals and parking
                  garages; and process surveillance in commercial  manufacturing
                  where environment and automation  require advanced  monitoring
                  systems.

         o        Develop New Products. Video intends to continue to enhance its
                  current  products and develop  innovative new products through
                  internal  research and  development  and  potentially  through
                  strategic  acquisitions or alliances which will allow a faster
                  and/or more  cost-effective  market introduction of additional
                  products  and   enhancements.   Video  recently   acquired  an
                  exclusive  perpetual  license  for  the  technology  that  has
                  enabled a more rapid  development of its innovative  real-time
                  POS system.

Market Overview

         A variety of security  surveillance,  theft  detection  and  monitoring
systems  are  currently  used in a broad  range of  applications  and  settings.
Historically  video  surveillance  has been limited to  fixed-mount  or PTZ dome
systems in which the camera is mounted in a fixed location.  Management believes
that the SentryVision system, which permits the cameras to move laterally within
an enclosure that conceals the camera's  location,  offers superior  performance
and  flexibility  in a number  of video  surveillance  and  monitoring  markets,
including loss prevention surveillance,  security surveillance and operation and
process monitoring.

         Loss Prevention Surveillance. Loss prevention surveillance cameras have
long  been used by  retailers  and  other  businesses  to  control  losses  from
shoplifting  and employee  theft.  According to the results of the 1996 National
Retail Security Survey, Final Report published by the University of Florida (the
"NRSS"),  the surveyed  retailers (which included 311 total respondents) lost an
average  of  1.87%  of  their  total  sales  to  inventory  shrinkage  in  1995,
attributable primarily to employee theft,  shoplifting and administrative error.
The NRSS excluded restaurants,  bars, vehicle dealers, auto service stations and
direct  catalog sales  segments of the retail  industry  from the survey.  Video
believes that this translates into a total inventory  shrinkage level in 1995 of
approximately  $25 billion for the surveyed segments of the United States retail
market.* The NRSS further reports that the average retail loss prevention budget
for the surveyed companies equalled 0.62% of annual retail sales. Video believes
that  this  translates  into  approximately  $8  billion  spent  in 1995 on loss
prevention  in  the  surveyed  segments  of the  United  States  retail  market.
According to the NRSS, CCTV was the most often used loss prevention  system, and
those surveyed  indicated  that, in addition to increasing  security  personnel,
they were likely to increase usage in  technologically  advanced systems such as
CCTV,  POS/CCTV  interfacing  and electronic  anti-shoplifting  products.  Video
believes that retailers, many of whom operate on small margins, will continue to
place greater  emphasis on inventory  shrinkage  control as a means of improving
profits,  and will be attracted to the SentryVision  system as a cost-effective,
technologically advanced means of loss prevention.

         Many large retail stores are  characterized  by numerous  aisles,  tall
shelves,  hanging  signs and other  visual  obstructions.  Such stores also have
multiple  checkout  lanes  located  in the  front  of  the  store.  These  store
configurations,  which are designed to maximize the utilization of retail space,
create a number of  surveillance  and loss prevention  challenges.  For example,
conventional  surveillance  techniques often provide incomplete coverage,  which
can  result  in  fewer   apprehensions  of  shoplifters.   Similarly,   multiple
fixed-mount  cameras are necessary to effectively monitor employee theft at each
cash register.  Retailers also encounter  theft related losses in warehouses and
large  distribution  centers.  Distribution  centers often  encompass very large
areas,  have high  ceilings  and tall  product  shelves,  and  include  numerous
unsupervised  areas where theft can occur. As such,  these areas are well suited
for a traveling  surveillance  system  which can be  controlled  to maximize the
coverage area.

         Security  Surveillance.  Security  surveillance  cameras  are  used  to
provide personal  security in stairwells,  elevators,  parking garages and other
secluded areas, as well as for general security in convenience stores, around

- --------

* Based upon an  estimated  1995  retail  sales  total of  approximately  $1.339
trillion  for the  segments  of the retail  industry  included  in the NRSS,  as
derived from sales  information  contained in the U.S.  Census  Bureau,  Current
Business  Reports,  Series  BR/94-RV,  Combined Annual and Revised Retail Trade,
January 1985 Through December 1994, Washington, D.C. 1995.

                                       53
<PAGE>

building perimeters, and in government,  banking and large office facilities. In
these  applications,  a traveling  camera  carriage allows the user to view into
areas where  conventional  fixed-mount or PTZ dome cameras are unable to provide
the same coverage.  Video  believes  there are numerous  markets for a traveling
CCTV  system  in  general  security  surveillance.   For  example,  correctional
facilities  may use such systems to conduct visual  cellblock  tours and monitor
dining  halls  and  corridors.   Such   applications   could  provide  increased
flexibility,  more efficient use of guard staffing,  and a safer and more secure
means of performing  routine patrols and tour functions.  In addition,  the size
and  linear  designs of the  terminals  and other  internal  areas of most major
airport  facilities  lend  themselves  to  a  traveling   surveillance   system,
particularly one capable of working in conjunction with conventional  peripheral
alarm and access control systems.

         Operational   and   Process   Monitoring.   Operational   and   process
surveillance  cameras  are  used  to  monitor  specific  activities,   including
manufacturing and assembly line operations,  to ensure quality control, employee
safety and fast  identification  and repair of problem areas. Many manufacturing
and assembly line operations cover large areas and include  operations which are
not readily  accessible to human inspection.  Multiple  stationary  surveillance
cameras and/or on-site monitoring personnel can be expensive and may not provide
the desired level of monitoring and control. In these environments, a traveling,
pre-programmed  or manually  controlled  camera may offer a number of innovative
monitoring solutions.

Current Products

         Video's system consists of a camera carriage unit, a continuous  tinted
enclosure and electronic control  equipment.  The carriage unit moves within the
enclosure and carries two pan/tilt/zoom  CCTV cameras,  electronic  transmission
components  and a motor drive.  The carriage track and enclosure are designed to
specific custom lengths and may include corners with cornering  camera carriages
for more complete viewing. Using Video's patented transmission  technology,  the
carriage  unit  transmits a video signal from the  camera(s)  through two copper
conductors running inside the enclosure to a receiver unit located at one end of
the  carriage  track.  The  copper  conductors  also  carry  power to the camera
carriage,  eliminating  the need for  power or  communication  cables.  From the
receiver unit, the video signals are relayed to a central monitoring location by
wire or fiber  optics,  where a system  operator can position or move the camera
carriage to obtain the best  vantage  point  while  viewing  and  recording  the
continuous,  live  video  pictures.  The  system  design  supports  conventional
peripheral devices, such as videocassette recorders, alarm inputs, pan/tilt/zoom
camera  and lens  control,  monochrome  or color  cameras,  and  voice  intercom
systems.

         The SentryVision  system typically  employs two cameras facing opposite
directions and operates at variable speeds up to 15 feet per second.  The system
is designed to allow three control modes:  manual control,  automatic patrol, or
automated  control.  In the manual  control mode,  the  combination  of carriage
movement,  camera pan, tilt and zoom features, and the ability to view from each
side of the  enclosure,  enables the user to manually  follow and record persons
engaging in suspected activities from a central control station. When engaged in
the  automatic  patrol mode,  the carriage  will  automatically  travel  through
pre-programmed "tours" of a facility, affording precise camera views of intended
target  locations.  Video  anticipates  that  tours may be  programmed  for full
end-to-end  facility   observation,   random  view  facility   observation,   or
user-defined  facility  observation with a series of stops at precise  locations
focusing on precise views.  Under an automated control mode, the system would be
operated as a component  in an  automated  control  system.  This  configuration
enables the system to respond to control  commands  provided  externally  to the
system through a serial  interface port. In addition,  the  SentryVision  system
utilizes  the RS-232  communication  protocol,  which  allows  Video's  carriage
control to be integrated with any industry standard controller.

         The  SentryVision  carriage was designed and  manufactured to provide a
number of  different  options  and  features  that can be  applied  to  customer
specific  applications.  Available options include 30 degree panning,  black and
white (low  light)  cameras and 10x or 12x lens  upgrades.  These  features  are
offered to customers as value-added upgrades to the standard carriage.

         Video is in the process of developing a unique POS video control system
which  utilizes the  automated  control mode of the  SentryVision  system.  This
automated  control system is designed to extract  transaction  information  from
on-site  retail POS  terminals,  monitor  the  transactions  for  exceptions  to
standard  transactions,  analyze occurrences of repeated exceptions for abnormal
activity by specific  cashiers,  and then  trigger  the  SentryVision  system to
capture  the  suspect  activity on video  tape,  overlaying  real-time  register
transaction  


                                       54
<PAGE>

information  on the closed  circuit video  picture.  The  SentryVision  system's
ability  to  provide   precise   overhead  views  of  register   terminals  when
automatically  triggered by POS activity will  differentiate this product in the
market. Video's POS system has been installed in a store for customer testing.

Customer Applications

         Retail  Market  Applications.  Video sold its first systems in 1992 for
installation in parking garage security surveillance  applications,  but quickly
moved its  market  focus  into the  retail  sector.  In this  sector,  Video has
identified  a number of  specific  market  segments  for which its  SentryVision
systems  are  well  suited  for loss  prevention  surveillance,  including  home
centers,  mass  merchandise  chains,  supermarkets  and drug stores,  as well as
related  distribution  centers. The key application is inventory loss prevention
in the  stores,  stock  rooms  and  distribution  centers.  In  addition,  fraud
detection  at the  cash  registers  is a major  new  application  area  with the
introduction of Video's POS system.

         Video's  system is  typically  installed  in retail  stores which use a
checkout area at the front of the store and product display  configurations  and
high  merchandise  shelving  which form rows and aisles.  Video  specializes  in
designing system  applications which are customized to fit a customer's specific
needs and which integrate the customer's  existing  surveillance  equipment (PTZ
dome and fixed-mount  cameras) with the SentryVision  system. The flexibility of
the system  allows the customer to specify  target-coverage  areas  ranging from
stock rooms to total store coverage and focus on shoplifting or employee  theft.
The  SentryVision  system is installed  near the ceiling  along the rows of cash
registers  and  between  the ends of the  merchandise  aisles.  This  allows the
retailer to easily observe both the cash handling  activities of cashiers in the
checkout area and customer  activities between the merchandise rows, despite the
presence of hanging signs and other obstructions.  The entire sales floor can be
monitored  efficiently  by  focusing  up and down the  aisles  and by moving the
carriage  horizontally  from  aisle to  aisle,  or from  cash  register  to cash
register.  In  addition,  with the use of camera  tilt and zoom  lens  features,
activities in each area can be monitored in greater detail. Results from Video's
current installations indicate significant improvements in detecting shoplifting
and employee  theft.  Customers  using Video's system have reported  significant
reductions in theft-related inventory shrinkage.  Video is expanding its product
line for loss prevention  surveillance in retail stores by adding its innovative
POS video surveillance system.

         o        Home  Centers.  Video  has  installed  systems  in  155  store
                  locations for four customers in the home center segment of the
                  retail market.  Home centers represent Video's fastest growing
                  market  segment.  In the past three years,  Video's system has
                  been installed in 130 locations for Lowe's Home Centers, a 387
                  store chain,  and in 23  locations  for Mills Fleet Farm, a 32
                  store  regional  hardware,  home  supply and  discount  retail
                  chain.  Both  companies   required  systems  for  total  floor
                  coverage, with Lowe's Home Centers choosing to integrate track
                  cameras  with PTZ dome and  fixed-mount  cameras,  while Mills
                  Fleet Farm chose to use only the track  camera  system.  Video
                  received  Security  magazine's  "Best"  award for New Security
                  Installation  in June 1994 for its  installation  in the Mills
                  Fleet Farm store in  Brooklyn  Park,  Minnesota.  In  addition
                  Mills  Fleet  Farm  has one  store  with  Video's  POS  system
                  integrated with a SentryVision system over the cash registers.

                  According to industry  publications,  the home centers  market
                  consists of  approximately  5,000 companies  operating  20,000
                  stores  in the  United  States,  with the top  nine  companies
                  operating over 5,000 stores.  Typical systems for home centers
                  installations  range in price  from  $20,000  to  $30,000  for
                  smaller  stores and from $80,000 to $150,000 for larger stores
                  requiring more carriage runs to provide adequate coverage.

         o        Mass  Merchandise  Chains.  Video has installed  systems in 23
                  store  locations for six customers in this segment,  including
                  Target  Stores  and TJ  Maxx.  The  targeted  coverage  varies
                  extensively  in these  installations  from only stock rooms to
                  total store coverage.  According to industry publications,  in
                  1995 the mass  merchandise  market in the  United  States  had
                  approximately   140  companies   operating  over  9,000  store
                  locations, with the top nine companies operating approximately
                  7,500 of these stores.  Typical  systems for mass  merchandise
                  stores  range in price from  $20,000 to  $30,000  for  smaller
                  stores or target  coverage  areas and from $90,000 to $130,000
                  for large systems.



                                       55
<PAGE>

         o        Supermarkets.   Video  has  installed   systems  in  19  store
                  locations  for  seven  supermarket  customers.   The  targeted
                  coverage  in most of these  installations  has been the entire
                  retail space.  The  supermarket  segment of the market is very
                  fragmented  in  the  United  States.   According  to  industry
                  publications,  in 1995 approximately  2,000 companies operated
                  over 34,000 stores,  with over half of those companies  having
                  fewer  than  four  stores.   The  top  26  companies   operate
                  approximately  half of the total stores.  Typical  systems for
                  supermarket  installations  range in  price  from  $15,000  to
                  $20,000  for  smaller  stores to $40,000 to $50,000 for larger
                  stores.

         o        Drug Stores. Video has installed 24 systems for two drug store
                  customers,  including  a major  national  drug store  chain of
                  approximately  1,750  stores.  The targeted  coverage area for
                  this  customer  is the entire  store.  According  to  industry
                  publications,  in 1995  the drug  store  market  consisted  of
                  approximately 1,400 companies operating  approximately  21,000
                  stores.  Typical  systems for the drug store  market  range in
                  price  from  $15,000 to $25,000  for  smaller  stores and from
                  $40,000 to $50,000 for larger stores.

         o        Distribution  Centers.  Video also  provides  loss  prevention
                  surveillance for retail  distribution  centers and warehouses,
                  and has installed  systems in 27  distribution  centers for 14
                  different  customers.  Traveling  through a  facility  from an
                  overhead  position,  Video's  system  can  monitor  activities
                  occurring  between  the  stacked  rows of  cartons or lines of
                  hanging  garments.  The  system  can also move a  surveillance
                  camera into position to monitor  shipping and receiving  docks
                  and  parked   delivery   trucks.   To   achieve   surveillance
                  capabilities equivalent to those of the SentryVision system, a
                  conventional  PTZ dome system or fixed-mount CCTV camera would
                  have to be installed at every desired vantage point, requiring
                  numerous   cameras,   additional   equipment  and  wiring  and
                  increased  installation and operating  costs.  Even though the
                  potential  number  of  retail  distribution  centers  is  much
                  smaller than the related number of store locations, management
                  believes  that  such  distribution  center  installations,  in
                  addition to providing an important  revenue source,  provide a
                  potential point of entry into the retail stores of a number of
                  major  retailers.  Typical  systems  for  distribution  center
                  installations  range in price from  $40,000  to $50,000  for a
                  small system to over $200,000 for a large system.

         o        Security  Surveillance.  Video has installed  systems in three
                  parking  garages for two  customers.  The coverage area is the
                  total parking ramp including in and around the parked cars. In
                  addition,  Video has installed one system in a bus terminal to
                  provide coverage of the maintenance area of the garage.  Video
                  has  made  proposals  to  correctional   facilities,   airport
                  terminals, airport baggage handling and baggage claim areas as
                  well as airport parking facilities.

         While the security  surveillance  and operation and process  monitoring
markets may significantly benefit from the increased security,  surveillance and
monitoring  provided by Video's system,  such  applications have been limited to
date.  Management  believes  future  orders in these  additional  markets may be
characterized  by long lead times  between  proposals  and  shipments,  and that
marketing  and other  related  expenses may be incurred in periods  prior to the
recognition of any matching sales.

Customers

         Video's  customers  include five of the top 20 United States retailers.
According to the July 1995 issue of STORES  magazine,  the top 20 retailers have
approximately 45,000 stores.  Video's strategy is to build on its initial retail
sales by  implementing  a direct  sales  program  targeting  the retail  market,
including the top 100 United States retailers.

         Although the composition of Video's largest  customers has changed from
year to year, a significant  portion of Video's sales has been attributable to a
limited  number of major  customers in each of the past two years and during the
first nine months of 1996.  Lowe's Home  Centers and Mills Fleet Farm  accounted
for 33% and 48%, respectively, of Video's sales in 1994 and 67% and 12% in 1995.
For the nine months ended  September  30, 1996,  Lowe's Home Centers and TJ Maxx
accounted  for 69% and 15%,  respectively  of Video  sales.  No other  customers
accounted  for more than 10% of  Video's  sales  during  1994,  1995 or the nine
months ended  September  30, 1996.  While Video  believes that one or more major
customers could account for a significant portion of its sales for at 


                                       56
<PAGE>

least the next two years,  management  anticipates  that its customer  base will
continue to expand and that in the future Video will be less  dependent on major
customers.

Sales, Marketing and Customer Service

         Video's products are currently  marketed by Video's direct sales force.
Video's systems are marketed in the United States primarily  through the efforts
of Video's  President  and one direct  salesperson.  Video  intends to focus the
majority  of its  direct  sales  effort to  further  penetrate  loss  prevention
applications  in  the  retail  sector.  Video  believes  that  additional  sales
personnel  will  increase  its  exposure in other market areas such as security,
operational and process monitoring.

         Video  also uses a variety  of other  marketing  techniques,  including
membership in trade associations, advertising in trade publications and targeted
direct mailing. Video intends to continue to participate in national trade shows
and to use promotional video tape demonstrations of Video's products.

         Video currently has a 15 person customer service and technical  support
staff.  Customer  service,  maintenance and repairs are also provided by Video's
installation  technicians  and  third-party  subcontractors.  Video  operates  a
24-hour  customer  service  telephone  message  center to receive and respond to
customer  questions  and service  requests.  Video also offers its  customers an
annual maintenance program.

         Delivery  lead  times  for  Video's   systems  are  relatively   short.
Accordingly, Video believes that its backlog at any given point in time is not a
reliable  indicator of future sales.  The absence of a  significant  backlog may
contribute to unpredictability of Video's results of operations.

Product Development

         Research and development is conducted by Video's engineering, technical
and support staff,  and by independent  contractors.  Video's  expenditures  for
research,  development and engineering were $351,892,  $606,882, $320,514 during
the years ended December 31, 1994,  1995 and the nine months ended September 30,
1996,  respectively.  To date,  Video's  research and  development  efforts have
focused on developing  and improving  its traveling  CCTV security  surveillance
system and incorporating POS controls into the system.

         During  1995,  Video  completed  development  of its second  generation
product known as the SentryVision system. This system is a microprocessor-driven
product  which  employs the same video signal  transmission  technology  used in
Video's previous traveling system. The significant  advancements of SentryVision
include precise  carriage  position  control,  programmable  camera movement and
positioning,  increased carriage speed control, a downsized  enclosure and added
cornering  capabilities.  A key  addition  provided  in the  system  is a serial
communication  and  control  interface  which  enables  control of the system by
various external devices. In addition to the improved  performance,  this system
is designed for reduced material, assembly, installation and service costs.

         The third generation of the SentryVision system  ("SentryVision II") is
currently in the research and  development  stage and is expected to replace the
existing  SentryVision  system.  SentryVision  II is intended  to offer  broader
applications  in  domestic   markets,   increased   product   compatibility  for
international   markets,   quality  enhancements,   substantial   reductions  in
production costs, enhanced video performance and an upgraded software features.

         Video's other major research and development  effort  occurring  during
the past eighteen months is its POS control system.  This system  integrates POS
control   technology  with  the  serial  control  interface  provided  with  the
SentryVision  system. The development effort to date has included adaptations of
its POS technology to large retail store environments,  graphical user interface
software for user programmability,  exception analysis algorithms for prediction
of abnormal  transaction  behavior and integration into the SentryVision system.
The  resulting  combination  will be a fully  programmable  real-time  POS video
control system.

         Research and development activities scheduled for the remainder of 1996
and through 1997 include developing additional  enhancements and features to the
SentryVision   system  including  motion  detection   capabilities,   increasing
compatibility  of the POS video control  system with a broader range of register
types and designing a


                                       57
<PAGE>

SentryVision  dome  camera.  The  SentryVision  dome  camera will be designed to
incorporate  Video's video picture and power transmission  technology into a PTZ
dome camera.

Manufacturing and Installation

         Video's  manufacturing  operations consist primarily of the assembly of
its  camera  carriages  and  control  units  using  materials  and  manufactured
components purchased from third parties.  Some parts are stock,  "off-the-shelf"
components,  and other materials and system components are designed by Video and
manufactured to Video's specifications.  Final assembly operations are conducted
at Video's  facilities in Eden Prairie,  Minnesota.  System components and parts
included  cameras,  circuit  boards,  electric  motors and a variety of machined
parts. Each system component  undergoes a quality assurance check by Video prior
to its shipment to an  installation  site.  Video is not subject to any state or
federal  environmental  laws,  regulations  or  obligations  to  obtain  related
licenses  or  permits  in  connection  with  its   manufacturing   and  assembly
operations.

         Product installation is conducted by Company personnel or pre-qualified
installation subcontractors who are managed by Video's project management staff.
Installations  typically  take from  three  days to three  weeks and  consist of
mounting the enclosures, installing the controller unit, installing the carriage
assembly,  and  connecting  control  and  transmission  cables  to  the  central
monitoring  location.  Items such as high voltage power  termination  wiring are
typically the responsibility of the end user.

Competition

         The security,  surveillance  and theft detection  industries are highly
competitive.  Video's system competes with conventional PTZ dome and fixed-mount
CCTV systems, electronic article surveillance tagging systems and other magnetic
and  electronic  devices,  private guard  services and burglar  alarms.  Video's
competitors   include  Checkpoint   Systems,   Burle  Industries,   Inc.,  Pelco
Manufacturing,   Inc.,   Vicon   Industries,   Inc.,   Sensormatic   Electronics
Corporation,  Ultrak,  Inc.  and  Panasonic  Broadcast  and  Television  Systems
Company. Many of these competitors,  and potential competitors,  are established
companies with significantly  greater  financial,  sales and marketing and other
resources than Video.  Management  believes that Video's  SentryVision system is
the  only  proven,   commercially   accepted  traveling  CCTV  system  currently
available.  Video expects to compete  effectively in the market for surveillance
and loss  prevention  systems on the basis of superior  performance,  design and
engineering  and by offering  greater and more  detailed  visual  coverage  than
conventional CCTV systems.

Patents and Intellectual Property

         Video currently  holds a United States patent  expiring in 2010,  which
covers the cable free transmission of the video signal to and from the carriage.
This technology  prevents  degradation of the video signal which can result from
movement and prolonged  friction caused by the carriage.  Video has also applied
for  corresponding  foreign patents.  Video intends to seek patent protection on
specific aspects of the SentryVision system. In addition,  Video intends to seek
patent  protection in the future for certain aspects of new systems which may be
developed.  There  can be no  assurance  that any  patents  applied  for will be
issued,  or that the patent currently held, or new patents,  if issued,  will be
valid if  contested  or will provide any  significant  competitive  advantage to
Video.

         Video is not  aware of any  infringement  of  patents  or  intellectual
property  held by  third  parties.  However,  if  Video  is  determined  to have
infringed on the rights of others, Video may be required to obtain licenses from
such other parties.  There can be no assurance that the persons or organizations
holding  desired  technology  would grant  licenses at all or, if licenses  were
available,  that the terms of such licenses  would be  acceptable  to Video.  In
addition,  Video could be required to expend  significant  resources  to develop
non-infringing technology.

         Video  is  aware  of an  Australian  patent  and an  Australian  patent
application  describing  certain  aspects of a product which in some respects is
similar to the SentryVision system.  Video's patent attorneys have advised Video
that the Australian  patent and  Australian  patent  application  appear to have
lapsed.  To  Video's  knowledge,  the  holder  of the  Australian  patent is not
currently marketing,  within the United States or Europe, the product covered by
the Australian  patent.  In addition,  no issued patents or patent  applications
corresponding to the Australian patent or the Australian patent application have
been  uncovered in the United  States or any other  foreign  country.  See "RISK
FACTORS -- Risks Relating to Sentry - Dependence on Proprietary Technology."


                                       58
<PAGE>

         Video is also aware of a British patent  application from a third party
disclosing  aspects  of a  device  which  is in  some  respects  similar  to the
SentryVision  system.  Video's  patent  attorneys  have  advised  Video that the
British  patent  application  appears to have  lapsed.  In  addition,  no issued
patents or patent  applications  corresponding to the British patent application
have been  uncovered  in the  United  States or any other  foreign  country.  To
Video's  knowledge,  the  applicant  is  not  currently  marketing  the  product
described in the  application.  See "RISK FACTORS  --Risks  Relating to Sentry -
Dependence on Proprietary Technology."

         Video  also  intends  to rely on the  registration  of  trademarks  and
tradenames, as well as on trade secret laws and confidentiality  agreements with
its  employees.  While  Video  intends  to  continue  to  seek  to  protect  its
proprietary technology and developments through patents, trademark registration,
trade  secret  laws  and  confidentiality  agreements,  it does not rely on such
protection  to establish and maintain its position in the  marketplace.  Video's
management  believes that  improvement of its existing  products,  reliance upon
trade secrets and on unpatented proprietary know-how, and the development of new
products  will  be  as  important  as  patent  protection  in  establishing  and
maintaining a competitive advantage.

Employees

   
         As of December 31, 1996, Video had 32 full-time  employees,  consisting
of  12  in  installation  and  scheduling,  two  in  engineering,  research  and
development and technical  support,  12 in customer service,  three in sales and
marketing,  one in  materials  management,  and  two in  accounting  and  senior
management positions.  Video's employees are not represented by a labor union or
covered  by a  collective  bargaining  agreement  and  Video  believes  employee
relations are good.
    

Facilities

         Video is  headquartered  in a leased  office,  assembly  and  warehouse
facility of  approximately  13,000 square feet in Eden Prairie,  Minnesota.  The
lease for the facility expires March 31, 1999.

Legal Proceedings

         There are no material legal proceedings pending or, to the knowledge of
management, threatened against Video.

Committees of the Board of Directors

         The Video Board has  established an Audit  Committee and a Compensation
Committee,  each of which  consists of Mr. Furst,  Dennis R. Johnson and Jean R.
Stiegemeier.  The  Audit  Committee  recommends  engagement  of the  independent
auditors,  considers  fee  arrangement  and  scope  of the  audit,  reviews  the
financial  statements and the independent  auditors report,  considers  comments
made by  Video's  independent  auditors  with  respect to its  internal  control
structure,  and reviews internal accounting procedures and controls with Video's
financial and accounting  staff.  The  Compensation  Committee  establishes  and
executes compensation policy and programs for Video's executives and employees.

Director Compensation

         Video has granted  non-qualified  stock  options under the Video Sentry
Corporation  Amended and Restated  1993 Stock Option Plan (the "Video  Plan") to
its directors who are not employees of Video in connection with their service as
directors,  as follows: Mr. Furst has been granted an option for the purchase of
30,000 shares;  Mr. Johnson has been granted  options for the purchase of 10,000
shares;  and Mr. Stiegemeier has been granted options for the purchase of 37,500
shares,  of which 30,000 were granted in connection with a consulting  agreement
and 7,500 were  granted in  connection  with his  service  as a  director.  Such
options expire five years from the date of grant.

   
         As of December 31, 1996, Mr. Stiegemeier's  options were exercisable as
to 30,000 shares at an exercise  price of $2.50 per share and as to 5,625 shares
at an exercise price of $3.60 per share; Mr. Furst's options were exercisable as
to 30,000  shares at an  exercise  price of $1.33 per share;  and Mr.  Johnson's
options were  exercisable  as to 10,000 shares at an exercise price of $5.13 per
share. Each of such options expires five years from the date 



                                       59
<PAGE>

of grant. Directors of Video are elected annually to serve until the next annual
meeting of shareholders or until their successors are duly elected. Directors of
Video currently  receive no cash  compensation  for their services as directors.
See "CERTAIN TRANSACTIONS OF VIDEO."
    

<TABLE>

Executive Compensation

   
         The  following  table  sets  forth  the  compensation  paid to  Video's
President and Chief Executive  Officer or accrued by Video for services rendered
during the years ended December 31, 1994 and 1995:
    

<CAPTION>

                                                                         Annual Compensation
                                                                         --------------------             All Other
Name and Principal Position                         Year               Salary              Bonus         Compensation 
- ---------------------------                         ----               ------              -----         ------------
<S>                                                  <C>             <C>                     <C>             <C>
Andrew L. Benson, Chief                              1994            $  84,436               --              --
Executive Officer and President
Andrew L. Benson, President                          1995             128,365                --              --
Michael J. Lindseth(1)                               1995              71,635                --              --

<FN>
- --------------
(1)      Mr.  Lindseth  served as Chief  Executive  Officer from July 1995 until
         January 1996.
</FN>
</TABLE>

         No officer of Video,  including the Chief Executive  Officer,  received
more than  $100,000 in salaries and bonuses  during the year ended  December 31,
1994.


Employment Agreements

         Mr.  Benson  continues to serve as Video's  President  with a 1996 base
salary of $125,000.  Mr.  Benson has entered into a non-compete  agreement  with
Video  which  provides  that he may not  compete  with Video for a period of two
years  from the  date of his  resignation  or  termination,  and  that  upon any
resignation or termination for any reason, Mr. Benson is entitled to receive his
base salary for the entire two year period.

Stock Options

         The Video  Plan was  adopted  by the Video  Board and  approved  by the
shareholders in 1994. The Video Plan permits the granting of awards to directors
and employees of Video in the form of stock options. Stock options granted under
the Video Plan may be "incentive  stock  options"  meeting the  requirements  of
Section  422 of the  Code,  or  non-qualified  options  which  do not  meet  the
requirements  of Section 422. The Video Plan provides that the exercise price of
all incentive and non-qualified  stock options granted under the Video Plan must
be at least 100% and 85%, respectively, of the fair market value of Video Common
Stock at the date of grant.  The Video Plan  currently  provides  that the Video
Board may grant  options to purchase  up to an  aggregate  of 880,000  shares of
Video Common Stock.  As of October 31, 1996, an aggregate of 195,000 shares were
subject to  outstanding  stock options  under the Video Plan at exercise  prices
ranging from $1.33 to $11.62 per share,  and 355,000  shares were  available for
future option grants.

         The Video Plan is  administered by the Video Board and, as to executive
officers,  by the Compensation  Committee.  The Video Plan gives broad powers to
the Board and the Compensation  Committee, as the case may be, to administer and
interpret the Video Plan,  including the authority to select the  individuals to
be granted  options and to prescribe the particular  form and conditions of each
option  granted.  Options  may be granted  pursuant  to the Video  Plan  through
January 2003. The Video Plan may be terminated earlier by the Video Board in its
sole discretion.

   
         Video has reserved an aggregate  of 880,000  shares for issuance  under
the Video Plan. At December 31,  1996,  options to purchase  195,000 shares were
outstanding  under the Video  Plan,  355,000  shares were  available  for future
grants and options for the  purchase of 330,000  shares had been  exercised.  In
addition,  Video has warrants  outstanding for the purchase of 454,114 shares of
Common Stock, including the Warrants to purchase 101,000 

                                       60
<PAGE>

shares issued to Summit  Investment  Corporation  ("Summit")  and certain Summit
affiliates  (the  "Summit  Warrants")  and warrants to purchase  186,500  shares
issued  to  Summit,   certain  affiliates  of  Summit  and  certain  individuals
(collectively  with the Summit  Warrants,  the  "Warrants")  in connection  with
Video's  initial public  offering.  The Warrants  entitle the holders thereof to
certain  incidental  registration  rights  upon  the  filing  of a  registration
statement by Video and certain demand registration rights.
    

         The Summit  Warrants were issued in  connection  with the placement and
sale of Video's  promissory  notes in 1994.  The exercise  price for each Summit
Warrant is $3.375 per share.  The Summit  Warrants are  exercisable  at any time
during the five year  period  from and after the date the Summit  Warrants  were
issued (the  "Warrant  Term") and  provide the holders  thereof or the shares of
Common Stock issuable upon exercise of the Summit  Warrants  certain rights with
respect to registration under the Act. Each such holder has the right to include
any  of  the  shares  issuable  on  exercise  of  the  Summit  Warrants  in  any
registration  statement filed by Video in connection with any public offering by
Video for its own account of shares of Video's  Common  Stock during the Warrant
Term,  unless the principal  underwriter  with respect to such  proposed  public
offering  determines in good faith and in writing that such inclusion  would not
be advisable or detrimental to the success of the offering.

Stock Purchase Plan

         In June 1995, the Video Board adopted the Video Employee Stock Purchase
Plan (the "Video Stock Purchase  Plan") subject to approval by the  shareholders
of Video at Video's 1996 annual shareholders'  meeting. The Video Stock Purchase
Plan permits eligible employees to make voluntary  contributions through payroll
deductions to be used to purchase stock from Video on an annual basis at a price
equal to the lesser of 85% of the fair market  value of a share of Video  Common
Stock at the beginning of the plan year or at the purchase date. An aggregate of
100,000  shares have been reserved for issuance  under the Video Stock  Purchase
Plan. No shares of Video Common Stock have been issued  under,  and no person is
currently participating in, the Video Stock Purchase Plan.

Profit Sharing Plan

         In 1993, Video established the Video Sentry Corporation Retirement Plan
which covers  substantially all employees meeting the eligibility  requirements.
Contributions  to the plan are determined by the Video Board on an annual basis.
The plan  contains a provision  for a deferred  compensation  plan under Section
401(k) of the Code for eligible  employees.  No contributions  have been made by
Video to the plan to date.

Indemnification and Waiver of Director Liability

         Section 302A.521  of the  Minnesota  Act  provides  that  officers  and
directors  of Video have the right to  indemnification  for Video for  liability
arising  out of certain  actions.  Such  indemnification  may be  available  for
liabilities arising in connection with this Registration  Statement.  Insofar as
indemnification  for  liabilities  arising  under  the Act may be  permitted  to
directors,   officers   or   persons   controlling   Video   pursuant   to  such
indemnification  provisions,  Video has been  advised that in the opinion of the
Commission such indemnification is against public policy as expressed in the Act
and is therefore unenforceable.

         Video has adopted in its Articles of  Incorporation  a provision  which
limits  personal  liability for breach of the fiduciary duty of its directors to
the extent provided by 302A of the Minnesota Act. Such provision  eliminates the
personal  liability of directors  for damages  occasioned by breach of fiduciary
duty,  except for liability based on a director's  breach of the duty of loyalty
to Video or its shareholders, liability for acts or omissions not in good faith,
liability  for acts or omissions  involving  intentional  misconduct  or knowing
violation of law, liability based on payments or improper  dividends,  liability
based on violations of state securities laws, liability for any transaction from
which the director derived an improper personal benefit,  and liability for acts
occurring prior to the date such provision was added.



                                       61
<PAGE>

                 VIDEO MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

         Video  designs and markets a  programmable  traveling  CCTV system that
delivers a high  quality  video  picture and which is used in a wide  variety of
applications.  This proprietary system, called SentryVision,  is well suited for
loss  prevention  surveillance  in retail  stores and  distribution  centers and
security surveillance for monitoring and deterring illegal and unsafe activities
in a variety of other locations such as parking garages, correctional facilities
and public transit  terminals.  Video was formed on September 10, 1990, and from
its date of inception through December 31, 1991, Video devoted substantially all
of  its  efforts  to the  design  and  development  of  its  original  traveling
surveillance camera. In May 1991, Video filed an application for a United States
patent covering  certain aspects of its system,  and on August 3, 1993, a patent
was granted.  Video recognized its initial sales during 1992, and introduced its
second  generation  product,  the  SentryVision  system,  in March  1995.  Video
recognizes  revenue  for its  systems  at the  time  of  shipment.  Revenue  for
installation  is recorded when the system is installed and is netted against the
costs of installation included in cost of sales.

Results of Operations

Nine Months Ended September 30, 1996 Compared to Nine Months Ended September 30,
1995

         Sales.  Sales  for the nine  months  ended  September  30,  1996,  were
$2,000,000, a decrease of 74% compared to sales of $7,768,000 for the first nine
months of 1995.  The  decrease  in sales was due to  delays  in the  ability  of
several new and existing customers to move forward with purchasing decisions, in
part as a result of initial  quality  issues  with  respect  to  vendor-supplied
components for the SentryVision  system,  which was introduced in 1995. Although
the quality  issues have been corrected and new vendors  selected,  these issues
have  affected  1996 sales.  The  decrease in sales was also due to  significant
turnover  of Video's  sales  force.  Video has hired and is  training  new sales
people. For the first nine months of 1996, approximately 84% of total sales were
to two customers with multiple  locations.  One of these customers accounted for
approximately  69% of total sales.  Video expects sales to this customer to be a
significant percentage of total sales during the remainder of 1996.

         Gross  Profit.  Gross  loss  for the  first  nine  months  of 1996  was
($1,085,000),  compared to gross profit of $1,869,000  for the first nine months
of 1995.  The decrease in gross profit for the first nine months of 1996 was due
to the significant decrease in sales and related installation  activity,  higher
unabsorbed manufacturing overhead and higher warranty and service costs as Video
increased its service  organization to support the increased number of installed
customer sites.  The decrease in Video's gross profit margin for 1996 was due to
the  lower  level of sales  with  which to  leverage  the  fixed  manufacturing,
installation  and  service  department  costs  included  in cost of  sales.  The
decrease in the gross profit margin was also due to Video's increased investment
in customer  support and training  capabilities.  Video expects that the reduced
material  costs of its new  SentryVision  system  and its  installation  process
should provide an increase in the gross profit margin when sales increase.

         Operating  Expenses.  Operating  expenses  for the first nine months of
1996 were  $1,867,000,  a decrease of 4% as compared to the first nine months of
1995. Research,  development and engineering expenses decreased 31% in the first
nine months of 1996, since Video completed  development of its second generation
system in 1995. General and  administrative  expenses increased 7% for the first
nine  months of 1996 due to the  addition  of  management  personnel  and higher
insurance  and bad  debt  costs  compared  to the  first  nine  months  of 1995.
Operating  expenses as a percentage  of sales were 93% for the first nine months
of 1996,  compared  to 25% for the first nine  months of 1995.  The  increase in
operating  expenses as a percentage  of sales in 1996 was due to the lower level
of sales compared to 1995.

         Interest  Expense.  Net interest expense was $83,000 for the first nine
months of 1996,  compared to net  interest  income of $95,000 for the first nine
months of 1995.  Video earned interest income in 1995 from the investment of its
cash balances.

         Net Loss. Net loss for the first nine months of 1996 was $3,035,000, or
$0.63 per share,  compared to net income of $12,000, or $0.00 per share (rounded
to the nearest cent) for the first nine months of 1995. The net loss in 1996 was
the result of a significant decrease in sales and gross profit for that period.


                                       62
<PAGE>

Year Ended December 31, 1995 Compared to Year Ended December 31, 1994

         Sales.  Sales were  $8,610,000 in 1995, an increase of 103% compared to
$4,241,000 in 1994. The increase in sales was due to the increased acceptance in
the  marketplace  of the system  which  resulted in an increase in the number of
systems sold and shipped to new and existing  customers.  For 1995, 67% of total
sales were to a single customer with multiple locations.  Video expects sales to
this  customer  to be a smaller  percentage  of total  sales in the  future,  as
shipments under this initial contract are fulfilled and sales to other customers
increase.

         Gross Profit.  Gross profit was $1,268,000 in 1995, an increase of 58%,
compared  to $801,000 in 1994 due to the  increase  in sales.  The gross  profit
margin was 14.7% in 1995,  compared  to 18.9% in 1994.  The  decrease in Video's
gross profit  margin in 1995 was due  primarily to a single  contract  involving
system  configurations  with an unusually  high third party  equipment  content.
Video  realizes  a  substantially  lower  gross  profit  margin  on third  party
peripheral  equipment  which it integrates  with its own  proprietary  products.
Video  expects that in the future,  sales will include a smaller  percentage  of
lower margin third party peripheral equipment.  The decrease in the gross profit
margin  was  also due to  higher  installation  and  training  costs as  Video's
employees  and  subcontractors  learned to install the  SentryVision  system and
higher service costs as Video  corrected  initial  quality  problems with vendor
supplied  components for the new system.  Video has been able to reduce costs on
its new SentryVision system and its installation process which should provide an
increase in the gross profit margin in the future.

         Operating  Expenses.  Operating  expenses  were  $3,046,000 in 1995, an
increase of 97%, compared to $1,549,000 in 1994. However,  included in operating
expenses  in 1995 were  non-recurring  costs of  $207,000  related to a canceled
offering  of  common  stock  and  severance  costs of  $115,000  related  to the
resignation of Video's then chief executive  officer.  Research  development and
engineering expenses increased 72% in 1995 as Video completed development of its
second generation system, began developing its POS control system, and increased
overall  engineering  activities  and  personnel.  Sales and marketing  expenses
increased  131% in 1995 as Video  expanded  its sales  efforts to  identify  new
customers and further  penetrate  existing markets.  General and  administrative
expenses   increased   53%  in  1995  with  the  addition  of   management   and
administrative  personnel  to support the increase in sales,  combined  with the
added costs of being a publicly-held company and additional leased office space.

         Interest Income.  Net interest income was $98,000 in 1995,  compared to
net interest  expense of $99,000 in 1994.  Video earned  interest income in 1995
from the investment of its cash balances.

         Net Loss.  The net loss in 1995 was  $1,681,000,  or $0.36  per  share,
compared to a net loss of $847,000,  or $0.31 per share in 1994.  The 1995 loss,
which occurred  during the fourth  quarter,  was the result of reduced  revenues
from product sales and reduced installation  activity during the quarter.  Video
experienced unexpected delays in the ability of three existing customers to move
forward,  primarily due to weaker than expected  holiday sales and, in one case,
delays as a result of major  organizational  changes  from a recently  completed
acquisition. The loss also includes the severance costs for Video's former chief
executive officer and the costs related to a canceled secondary offering.

Year Ended December 31, 1994 Compared to Year Ended December 31, 1993

         Sales. Sales were $4,241,000 in 1994, an increase of 470%,  compared to
$744,000 in 1993.  The increase in sales was due to the increased  acceptance in
the  marketplace  of the system which resulted in the sale of 61 systems in 1994
compared  to the sale of 12 systems in 1993.  Each year also  included  revenues
from  long-term  contracts  with a single  customer  which  were  recognized  as
installations  were completed.  In 1994,  sales totaling  $343,000  related to a
contract  commenced  in 1994  that  carried  over to 1995,  and in  1993,  sales
totaling  $266,000 related to a contract  commenced in 1992 that carried over to
1993.

         Gross  Profit.  Gross profit was $801,000 in 1994, an increase of 345%,
compared to $180,000 in 1993. Gross profit margin was 18.9% in 1994, compared to
24.2% in 1993.  The  decrease  in the 1994  gross  profit  margin  was caused by
several factors. While Video was able to reduce the overall material cost of the
system,  installation  costs  increased.  During the last quarter of 1994, Video
began  installing  more systems  using its own personnel  rather than  utilizing
subcontractors.  As a result,  there were  start-up  costs  associated  with the
installation  process which negatively  impacted the gross profit margin.  Video
entered into a contract with one customer for the  installation  of systems in a
minimum of 70 stores,  which has been increased at the customer's  option to 100
stores. The 


                                       63
<PAGE>

installation  configurations  for these stores included a significant  amount of
third party  peripheral  equipment  integrated with Video's system.  Because the
gross  profit   margin   realized  on  third  party   peripheral   equipment  is
substantially  below the gross profit margin realized on Video's equipment,  the
high  proportion  of  sales  under  that  contract  compared  to  overall  sales
negatively impacted the gross profit margin in 1994.

         Operating  Expenses.  Operating  expenses  were  $1,549,000 in 1994, an
increase of 48%,  compared  to  $1,048,000  in 1993.  During  1994,  Video hired
additional  personnel to handle the  increase in sales.  Total  employee  levels
increased  to 26 at the end of 1994  from  seven at the end of  1993.  Research,
development  and  engineering  expenses  increased 73% in 1994. The increase was
primarily  due  to  the  research  and  development   expenses  associated  with
SentryVision,  Video's  second  generation  system,  as well as an  increase  in
overall  engineering  activities  and  personnel.  Sales and marketing  expenses
increased  by only 5% as Video  focused  on  targeted  customers  rather  than a
broad-based  sales and marketing  effort.  General and  administrative  expenses
increased 68% in 1994  primarily due to the hiring of additional  management and
administrative   personnel,   additional   expenses  as  a  result  of  being  a
publicly-held company and expansion of leased office space.

         Interest  Expense.  Interest  expense was $132,966 in 1994  compared to
$48,399 in 1993.  Prior to Video's 1994 initial public  offering of Video Common
Stock,  expanded operations required additional borrowings during the year. Such
additional  borrowings  included $1,560,000 of 10% unsecured notes payable which
were issued in March 1994,  as well as borrowings  under a bank credit  facility
that was in place during the year. The proceeds from the initial public offering
were received in October 1994, and a portion of the proceeds therefrom were used
to retire the then outstanding debt and related accrued interest.

         Interest Income. Interest income was $34,000 in 1994 as a result of the
investment of the remaining  net proceeds  from the initial  public  offering in
interest bearing marketable securities.

         Net Loss.  Net loss was $847,000 in 1994, or $0.31 per share,  compared
to a net loss of $916,000, or $0.38 per share, in 1993.

Net Operating Loss Carryforward

         As of September 30, 1996,  Video had a net operating loss  carryforward
of approximately $6,300,000,  which may be used to offset future taxable income,
if any,  through  December 31, 2011.  Management  believes  that,  following the
Merger,  the utilization of such net operating loss carryforwards may be subject
to significant limitations.

Liquidity and Capital Resources

   
         To date,  Video has financed its operations  primarily  through private
and public sales of Video Common Stock for which Video has received an aggregate
of $7,600,000 in net proceeds,  and borrowings  under a line of credit and notes
payable. Working capital at November 30, 1996 was ($425,867).

         In March 1996, Video entered into a $2,500,000  working capital line of
credit with Republic  Acceptance  Corporation.  The line of credit is secured by
substantially  all the  assets of Video and the  personal  guarantee  of Video's
President.  The line of credit accrues  interest at a rate equal to 3% above the
bank's reference rate and matures in March 1998.  Borrowing  availability  under
the line of credit is based on 80% of eligible accounts receivable and a maximum
of $250,000 of inventory.  At December 31, 1996, the loan balance under the line
of credit was $796,389 and remaining availability was minimal. Eligible accounts
receivable  increase as customer  installations are completed and final billings
are made.
    

         In May 1996, Video received  $500,000 under a promissory note (the "May
1996 Note") from Mr. Furst, one of Video's  directors,  with interest at 10% and
secured by all of the assets of Video.  In July 1996,  Video  received  $250,000
under a promissory  note (the "July 1996 Note") from an investor,  with interest
at 10% and  secured  by all of the assets of Video.  In  September  1996,  Video
received  $1,000,000  under a promissory  note (the  "September 1996 Note") from
another  investor,  which bears interest at 10%,  matures in January 1997 and is
secured by all of the assets of Video.  The September 1996 Note is  subordinated
to the bank line of  credit.  Both the May 1996 Note and the July 1996 Note were
repaid in full in September  1996 with proceeds from the September 1996 Note. In
October and November  1996,  Video  received an  aggregate of $250,000  from Mr.
Furst under a 


                                       64
<PAGE>

promissory  note (the  "October  1996 Note")  which allows Video to borrow up to
$500,000,  with  interest  at 10%,  and which  matures  in  January  1997.  This
promissory  note is secured by all of the assets of Video and is subordinated to
Video's bank line of credit.  As soon as practicable  after the Effective  Time,
Video will pay off the September  1996 Note and the October 1996 Note with funds
advanced to Video from Knogo.

         During  the first  nine  months of 1996,  cash used in  operations  was
primarily  for payments to vendors and to fund the  operating  loss.  Video also
invested $76,000 in purchased software costs for its point of sale system during
the first nine months of 1996.

         Video  anticipates  that its  working  capital  needs will  continue to
increase  due to operating  losses and the  expected  growth in the business and
expects  that it will need to raise  additional  capital  through debt or equity
financing.  There  is no  assurance  that  such  additional  financing  will  be
available when needed or on terms which are acceptable to Video.  Video believes
that  its  anticipated  capital  needs  will be  satisfied  as a  result  of the
completion of the Merger.  At, or shortly after, the consummation of the Merger,
Sentry  intends to enter  into a new credit  arrangement  with  Knogo's  present
lender,  Fleet Bank,  and thereafter to make advances to each of Video and Knogo
as the  businesses of the two  subsidiaries  may require.  Knogo's  current bank
credit  facility  consists of a $5 million dollar line of credit with Fleet Bank
which,  by its current  terms,  would be  terminated  upon  consummation  of the
Merger.  However,  based upon discussions  between Knogo's management and senior
lending officers at Fleet Bank, Sentry believes that a new facility will be made
available to it, to take effect after the Merger,  for at least the same amount,
and on substantially  the same terms, as are currently  available to Knogo. Such
facility would be secured by a lien on substantially all of the assets of Sentry
and its  subsidiaries.  It is  expected  that  Knogo  will make an advance of $2
million  to Video  upon  consummation  of the  Merger to  permit  Video to repay
certain existing indebtedness.

Inflation

         Video  has not been  significantly  impacted  by  inflation  since  its
inception.  Video did not have any material  commitments  for fixed assets as of
September 30, 1996.




                                       65
<PAGE>

<TABLE>

      VIDEO SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

         The following  table sets forth  information  regarding the  beneficial
ownership  of shares of Video  Common  Stock by each  director of Video,  by the
President and Chief Executive  Officer,  by all directors and executive officers
of Video as a group,  and by each  shareholder who is known by Video to own more
than 5% of outstanding Video Common Stock as of December 31, 1996.

<CAPTION>
                                                                                     Percentage of
                                                 Number of Shares                    Common Stock
           Beneficial Owner                    Beneficially Owned(1)                 Outstanding(2)
           ----------------                    ---------------------                 --------------
   
<S>                                                       <C>                               <C>  
Robert D. Furst, Jr. (3)                                  976,672                           19.5%
 6365 Carlson Drive
 Eden Prairie, Minnesota  55346

Andrew L. Benson                                          194,278                            4.0%
 6365 Carlson Drive
 Eden Prairie, Minnesota 55346

Ronald W. McClurg                                          10,000                               *
 6365 Carlson Drive
 Eden Prairie, Minnesota  55346

Perkins Capital Management (4)                            291,150                            6.0%
 730 East Lake Street
 Wayzata, Minnesota  55391

Dennis R. Johnson (3)                                      10,000                               *
 6365 Carlson Drive
 Eden Prairie, Minnesota  55346

Jean R. Stiegemeier (3)                                    35,625                               *
 11201 Hampshire Avenue South
 Bloomington, Minnesota  55438

All directors and executive (5)                         1,226,575                           24.2%
 officers as a group (5 persons,
 including those named above)
    
<FN>
- ---------------------------

*        Less than one percent.

(1)      Each person has sole voting and sole dispositive  power with respect to
         all outstanding shares, except as noted.

(2)      Based on 4,841,962  shares  outstanding  as of December 31, 1996.  Each
         figure showing the percentage of outstanding shares  beneficially owned
         has been  calculated  by treating as  outstanding  and owned the shares
         which could be purchased by the  indicated  person  within 60 days upon
         exercise of stock options.

(3)      Includes  shares which could be purchased upon the exercise of existing
         options and  warrants  which are  currently  exercisable  or which will
         become exercisable within 60 days of December 31, 1996, as follows: Mr.
         Furst  (175,182  shares);  Mr.  Johnson  (10,000  shares);  Mr. McClurg
         (10,000 shares); and Mr. Stiegemeier (35,625 shares).

(4)      According to its most recent Schedule 13F on file,  dated September 30,
         1996,  Perkins  Capital  Management  reported  sole  voting  power with
         respect to 6,500  shares,  and sole  dispositive  power with respect to
         291,150 shares.

(5)      Includes  230,807  shares which could be purchased upon the exercise of
         existing  option and warrants which are currently  exercisable or which
         will become exercisable within 60 days of December 31, 1996.

</FN>
</TABLE>


                                       66
<PAGE>

                          CERTAIN TRANSACTIONS OF VIDEO

         Between  October  1992 and  February  1994,  Robert D.  Furst,  Jr.,  a
director and principal shareholder of Video, made loans and advances to Video in
the aggregate principal amount of approximately $890,000.  Prior to August 1993,
such loans to Video were evidenced in part by a series of promissory notes, each
bearing an annual  interest rate of 10%. On August 3, 1993,  Video and Mr. Furst
entered into a revolving line of credit agreement (the "Credit Agreement") and a
security  agreement  pursuant  to which Mr.  Furst  agreed  to loan  Video up to
$500,000 at an annual interest rate of 10%. Pursuant to the security  agreement,
repayment of advances made under the Credit  Agreement was secured by all of the
assets  of  Video.  Upon  the  execution  of  the  Credit  Agreement,  the  then
outstanding  balance of the prior loans and advances in the aggregate  amount of
$469,500 was transferred to, and incorporated into, the Credit Agreement.  Video
made periodic  repayments of principal  and interest  between  December 1992 and
January  1994 in the  aggregate  amount of  approximately  $310,250,  which were
applied  first to interest  and then to  principal.  In 1993,  Video also repaid
$11,000  borrowed from Mr. Furst pursuant to a non-interest  bearing  promissory
note dated October 15, 1991 which was not included in the Credit  Agreement.  In
April 1994, Video used approximately  $623,000 of the proceeds from a $1,500,000
debt  issuance  to repay,  in full,  approximately  $615,000  of  principal  and
approximately  $8,000 of  interest  then  owing to Mr.  Furst  under the  Credit
Agreement, and the Credit Agreement was terminated.

         In connection  with the loans to Video described  above,  Video granted
warrants to Mr. Furst for the purchase of 145,182  shares of Video Common Stock.
Such warrants  range in exercise  price from $1.17 per share to $2.00 per share,
are currently exercisable in full, and expire between October 1997 and September
1998. To date, Mr. Furst has not exercised any of the warrants. In addition, Mr.
Furst was granted an option to purchase  73,530  shares at an exercise  price of
approximately $0.31 per share which he exercised in full in December 1992 for an
aggregate purchase price of $22,914.

   
         In May 1996,  Video received a loan of $500,000 from Mr. Furst pursuant
to the May 1996 Note.  This amount was repaid with  proceeds  from the September
1996  Note.  See  "Video  Management's  Discussion  and  Analysis  of  Financial
Condition  and  Results of  Operations  --  Liquidity  and  Capital  Resources."
Pursuant to the October 1996 Note, Mr. Furst has agreed to extend up to $500,000
of credit to Video through  December 31, 1996, at an annual interest rate of 10%
in order to fund Video's  ongoing cash needs. As of December 31, 1996, Mr. Furst
had  advanced  $250,000  to  Video  under  the  October  1996  Note.  As soon as
practicable after the Effective Time, Video will pay off the September 1996 Note
and the October 1996 Note with funds advanced to Video from Knogo.
    

         In September 1993, Video entered into a three year consulting agreement
with Jean R. Stiegemeier, a director of Video, pursuant to which Mr. Stiegemeier
agreed  to  provide  consulting  services  in the  form of  corporate  strategic
planning upon Video's  request.  In exchange for providing such services,  Video
granted Mr.  Stiegemeier  an option to purchase  30,000  shares of Video  Common
Stock at $2.50 per share.  Such option is currently  exercisable with respect to
15,000 shares and becomes  exercisable as to an additional  7,500 shares in each
of September 1995 and 1996.

         Video  believes  that all  prior  transactions  between  Video  and its
officers,  directors,  or  other  affiliates  of  Video  were on  terms  no less
favorable to Video than could have been obtained from unaffiliated third parties
on an arm's length basis. All future  transactions  with directors,  officers or
shareholders  holding  more  than  5%  of  outstanding  Video  Common  Stock  or
affiliates of any such persons, will be made for bona fide business purposes and
will be on terms no less  favorable  to Video  than  could be  obtained  from an
unaffiliated  third party and will be approved  by a  disinterested  majority of
Video's independent outside directors.


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<PAGE>

                                BUSINESS OF KNOGO

General

         Knogo was created in connection with an Amended and Restated  Agreement
and Plan of Merger (the "Sensormatic Merger Agreement"),  dated as of August 14,
1994,  among  Sensormatic,  the Knogo  Predecessor  and Knogo.  Pursuant  to the
Sensormatic  Merger  Agreement,  the  Knogo  Predecessor  merged  with  and into
Sensormatic on December 29, 1994 (the "Sensormatic  Merger").  Immediately prior
to the Sensormatic Merger, the Knogo Predecessor contributed to Knogo all of the
Knogo  Predecessor's  operations in the Territory and  distributed  one share of
common  stock of Knogo for each share of common  stock of the Knogo  Predecessor
held of record immediately prior to the Sensormatic Merger (the "Spinoff").

         Certain  information  in  this  Joint  Proxy   Statement/Prospectus  is
presented as if the Sensormatic  Merger and Spinoff were consummated on March 1,
1991. In addition, at the time of the Spinoff, Knogo changed its fiscal year end
from February 28 to December 31.
   

         Knogo is engaged in the design,  manufacture,  sale,  installation  and
servicing of a complete line of EAS  equipment.  Knogo  operates a 68,000 square
foot office,  research,  engineering and distribution facility in Hauppauge, New
York, a 55,000 square foot manufacturing  facility in Cidra,  Puerto Rico, and a
6,000 square foot office in suburban Chicago,  Illinois.  Knogo was incorporated
in Delaware in August 1994, while its corporate predecessor had been in business
for nearly 30 years.  Knogo's  executive  offices  are  located at 350  Wireless
Boulevard, Hauppauge, New York 11788 and its telephone number is (516) 232-2100.
    
         The EAS systems which Knogo  manufactures are based upon three distinct
technologies.  One system,  the Swept Radio Frequency ("Swept RF") system,  uses
medium  frequency  transmissions  in the two to nine megahertz range. The second
system, the Dual Radio Frequency ("Dual RF") system,  uses ultra-high  frequency
radio signals in the 902 megahertz  and 928 megahertz  bands.  The third system,
Micro-Magnetics  ("MM"), uses very low frequency  electromagnetic signals in the
range of 218 hertz to 9  kilohertz.  Knogo also  manufactures  a  non-electronic
dye-stain pin ("KnoGlo(TM)").  In addition, Knogo markets a closed circuit video
system,  or ("CCVS"),  known as "The KNOGO  Surveillor(TM)."  Effective April 1,
1996, Knogo became an authorized distributor of the library security systems and
related products of Minnesota Mining and Manufacturing Company ("3M").

         Of  Knogo's  bookings  in the  Territory  for  the  nine  months  ended
September 30, 1996  approximately 28% were attributable to the MM System, 16% to
the Swept RF system, 16% to the Dual RF system, 2% to the KnoGlo(TM) system, 15%
to the 3M library  security  systems  and 23% to the CCVS  system.  For the year
ended December 31, 1995  approximately  48% were  attributable to the MM system,
21% to the Swept RF  system,  13% to the Dual RF  system,  2% to the  KnoGlo(TM)
system, 4% to the Express system (a self-check system for libraries  ("Express")
which was sold by Knogo in March  1996) and 12% to the CCVS  system.  For the 10
month period ended  December  31,  1994,  and the year ended  February 28, 1994,
respectively,  approximately  20%  and  40% of  Knogo's  bookings  in the  Knogo
Territory were  attributable to the Swept RF system,  23% and 19% to the Dual RF
system,  43% and 32% to the MM system, 3% and 2% to the KnoGlo(TM)  system,  and
11% and 7% to the CCVS system,  respectively.  Knogo's  bookings  represent  the
gross value of orders accepted.

         The principal  application  of Knogo's  products is to detect and deter
shoplifting and employee theft in supermarket,  department,  discount, specialty
and various other types of retail stores including  bookstores,  video,  liquor,
drug, shoe,  sporting goods and other stores.  The use of these products reduces
inventory  shrinkage  by deterring  shoplifting,  increases  sales  potential by
permitting the more open display of greater  quantities of merchandise,  reduces
surveillance  responsibilities  of sales and other  store  personnel  and,  as a
result,  increases  profitability  for the  retailer.  In addition,  Knogo's EAS
systems are used in  non-retail  establishments  to detect and deter  theft,  in
office  buildings to control the loss of office  equipment and other assets,  in
nursing  homes and  hospitals  for both asset and patient  protection,  and in a
variety of other hard goods applications.

         Knogo has continued to devote  resources to the  development of its EAS
business in the supermarket  sector,  a relatively  untapped market among retail
users of loss prevention devices. While revenues in this market have been

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<PAGE>

modest relative to those produced in Knogo's traditional markets, Knogo believes
that this market offers considerable potential for growth.

         Knogo  has also  devoted  resources  to the  development  of its  asset
protection  business  in  non-traditional  areas,  particularly  in the  area of
manufactured hard goods such as printed circuit boards,  computer  processor and
memory  chips and  related  components.  While no  significant  revenue has been
received to date in connection  with this line of business,  Knogo  believes the
potential for growth in this market is considerable.

EAS Systems

         EAS systems  consist of  detection  devices  which are  triggered  when
articles  or persons  tagged  with  wafers or tags pass  through  the  detection
device.  The  principal  application  of the Swept RF and Dual RF  systems is to
detect and deter theft of soft goods such as clothing,  while the MM systems are
primarily  used to detect and deter the theft of hard goods  including  packaged
goods and books.

         At September 30, 1996, the  approximate  number of Knogo's Swept RF and
Dual RF systems sold or leased in the Knogo Territory  exceeded 13,200.  At that
date, the  approximate  number of Knogo's MM systems sold or leased in the Knogo
Territory exceeded 9,100.

Swept and Dual Radio Frequency Detection Systems

         Knogo  manufactures and distributes the Swept RF system,  the principal
application  of which is to detect and deter  shoplifting  and employee theft of
clothing in retail  establishments.  Knogo also manufactures and distributes the
Dual RF  system,  a  particularly  useful  and cost  efficient  EAS  system  for
soft-goods  retail stores with wide mall-type exit areas which  ordinarily would
require multiple Swept RF systems for adequate protection. The Swept RF and Dual
RF  systems  consist  of radio  signal  transmission  and  monitoring  equipment
installed at exits of protected areas, such as doorways,  elevator entrances and
escalator  ramps.  The  devices  are  generally  located in panels or  pedestals
anchored to the floor for a vertical arrangement or mounted in or suspended from
the  ceiling and mounted in or on the floor for a  horizontal  arrangement.  The
panels or pedestals are designed to harmonize  with the decor of the store.  The
monitoring  equipment  is activated by tags,  containing  electronic  circuitry,
attached to merchandise transported through the monitored zone. The circuitry in
the tag  interferes  with the radio signals  transmitted  through the monitoring
system,  thereby triggering  alarms,  flashing lights or indicators at a central
control  point,  or the  transmission  of an  alarm  directly  to  the  security
authorities.  By means of multiple  installations of horizontal Swept RF systems
or installation of one or more Dual RF system,  Knogo has the ability to protect
any size entrance or exit.

         Tags are  manufactured in a variety of sizes and types and are attached
directly to the articles to be protected by means of specially designed fastener
assemblies.  A tag is removed from the protected article,  usually by a clerk at
the  checkout  desk,  by  use  of a  decoupling  device  specially  designed  to
facilitate  the  removal of the  fastener  assemblies  with a minimum of effort.
Removal  of the tag  without a  decoupler  is very  difficult  and  unauthorized
removal will usually  damage the protected  article and thereby reduce its value
to a  shoplifter.  Optional  reminder  stations  automatically  remind the store
clerk, by means of audiovisual indicators, to remove the tag when the article is
placed on the cashier's desk.

         Swept RF and Dual RF systems  generally have an economic useful life of
six years  (although  many of Knogo's  systems  have been  operating  for longer
periods),  have a  negligible  false  alarm rate and are  adaptable  to meet the
diversified article surveillance needs of individual retailers.

Magnetic Detection Systems

         The primary  application  of MM systems is to detect and deter theft in
"hard  goods"  applications  such  as  supermarkets,  bookstores  and  in  other
specialty stores such as video, drug, liquor,  shoe, record,  sporting goods and
similar stores.

         MM   systems   use   detection   monitors   which  are   activated   by
electromagnetically  sensitized strips. The MM targets are typically attached to
the  articles  to be  protected  when  price  tags are  affixed  and are  easily
camouflaged on a wide array of products.  The detection  monitors used by the MM
systems are installed at three to five foot


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<PAGE>

intervals at the exits of protected  areas. The magnetic targets can be supplied
in many forms and are attractively priced, making them suitable for a variety of
retail  applications.  In  addition,  the MM targets can be  manufactured  to be
activated  and  deactivated  repeatedly  while  attached  to the  articles to be
protected,  which is a particularly desirable feature for use with items such as
books,  compact discs, CD Roms and  videotapes,  which may be "checked- out" and
later returned. Accurate deactivation is also very important when the item to be
protected is a personal  accessory  that will be carried by its owner from place
to place,  such as pocket  books,  pens,  lipstick,  shoes and  camera  film and
cameras.

         The MM system offers retailers  several features not available in Swept
RF and Dual RF systems.  Since the target is very small,  relatively inexpensive
and may be  inserted  at the point of  manufacture  or  packaging,  it  provides
retailers  with a great  deal of  flexibility  and is  practical  for  permanent
attachment  to a wide  variety  of  hard  goods,  especially  low  profit-margin
products. The target can be automatically deactivated at check-out,  eliminating
the risk of triggering alarms when merchandise leaves the store and saving sales
personnel  valuable time. Since the targets can be incorporated  directly into a
price tag, they are convenient to use.

         While  targets are  typically  attached by the retailer at the point of
sale,  the practices of applying the target at the  distribution  point ("Source
Tagging"),  or within the protected item ("Source  Imbedding"),  are increasing.
This program,  Universal Source Protection  ("USP"),  reduces  significantly the
retailer's  target  purchase  and  application   costs,   while  increasing  the
anti-theft  effectiveness of the system. As part of the Spinoff,  Knogo acquired
the  U.S.  and  Canadian  patents  for a new MM  strip  developed  by the  Knogo
Predecessor,  trade named  "SuperStrip(TM),"  whose small size, unique physical,
mechanical and detection  properties,  compatibility  with earlier generation MM
systems and low cost make it an ideal  candidate  for either  Source  Tagging or
Source Imbedding.

Other Loss Prevention Products

KnoGlo(TM)

         KnoGlo(TM),  a  non-electronic,  dye-stain  pin,  releases an indelible
liquid  when  tampered  with.  Used  with  passive  locking  mechanisms  without
electronics,  KnoGlo(TM)  is often a retailer's  first step in loss  prevention.
KnoGlo(TM)  is also  employed  in stores  with EAS  systems as an extra layer of
protection. Such protection is useful in problem areas (near mall door openings,
for example,) or where users must maximize selling space.

Closed Circuit Video Systems

         "The KNOGO  Surveillor(TM)"  enhances the  protection  of retail stores
from  shoplifting  and  employee  theft  by  providing  retailers  with  optical
surveillance  of the premises.  Knogo believes that,  while less profitable than
traditional  EAS  products,  the CCVS  complements  its  other EAS  systems  and
provides  retailers with further  protection against internal employee theft and
external shoplifting activities.  The CCVS can also be electronically  connected
to the EAS  system,  causing  a video  record to be  generated  when an alarm is
indicated.  Knogo does not manufacture its Surveillor(TM)  product, but installs
it from parts purchased from Knogo's vendors.

Production

         Knogo produces at its facilities in Cidra, Puerto Rico and, to a lesser
extent,  Hauppauge, New York, or purchases through suppliers, its Swept RF, Dual
RF and MM, KnoGlo(TM), and CCVS systems or their components. Production consists
of assembling  electronic and mechanical  components and printed circuitry which
Knogo  purchases  from various  suppliers.  Knogo's  specially  designed  tools,
plastic  cases for the tags,  and the target  bands  used in Knogo's  system for
patient  and  personnel  control,  are  produced  to Knogo's  specifications  by
independent contractors using existing molds and tooling. Knogo is not dependent
on any one supplier or group of suppliers of components for its systems. Knogo's
policy is to  maintain  its  inventory  at a level which is  sufficient  to meet
projected demand for its products. Knogo does not anticipate any difficulties in
continuing to obtain  suitable  components at  competitive  prices in sufficient
quantities as and when needed.

         Knogo manufactures and sells to Sensormatic  certain electronic article
surveillance  products pursuant to a Supply Agreement,  dated as of December 29,
1994 (the "Supply  Agreement").  Under the Supply Agreement,  for a period of 30
months after December 29, 1994,  products valued at a minimum of $24 million are
required to be supplied to Sensormatic's  operations outside North America. Once
the Supply Agreement terminates, Knogo will



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have to replace the lost volume in order to maintain  profitable  margins in its
manufacturing  operations.  See "Knogo  Management's  Discussion and Analysis of
Financial Condition and Results of Operations -- Results of Operations."

         In  January  1996,  Knogo  acquired  a  controlling   interest  in  K&M
Converting  Corp.  ("KMCC").  KMCC is a joint  venture  entered into with Marian
Rubber  Products  Co.,  Inc.  ("Marian").  KMCC is the  exclusive  converter  of
magnetic material into disposable targets or labels used in Knogo's EAS systems.

Marketing

         Knogo markets its products  through the direct efforts of approximately
24 salespersons located in selected  metropolitan areas across the United States
and Canada.  Knogo's customers include some of the major retail stores and store
chains in North America.

         Knogo's  EAS  systems  are  marketed  on both a direct  sales and lease
basis, with direct sales  representing  approximately  84% of the business.  The
terms of the standard  leases are  generally  from one to five years.  The sales
prices and lease rates vary based upon the type of system  purchased  or leased,
number and types of targets included,  the sophistication of the system employed
and, in the case of a lease, its term. In the case of the MM systems,  detection
targets which are  permanently  attached to the item to be protected are sold to
the customer even when the system is leased.  Therefore, in the case of either a
sale or  lease of an MM  system,  as the  customer  replenishes  its  inventory,
additional targets will be required for those items to be protected.  Knogo also
markets a more expensive,  removable, reusable detection tag for use with its MM
systems on certain products such as clothing and other soft goods.

         In keeping with industry  practices,  Knogo also selectively offers EAS
systems  on  a  deferred  billing  arrangement  and,  in  some  instances,  on a
short-term  introductory  basis.  At the end of such period the retailer has the
option to lease or purchase the equipment.

         During the nine  months  ended  September  30,  1996,  Knogo  placed in
service in the  Territory  approximately  800 Swept RF, Dual RF, and MM systems.
Knogo does not believe that the loss of any one  customer  would have a material
adverse effect on its business.

         Knogo  believes  that the  supermarket  industry  is a major  potential
market in North America for EAS systems, and believes its technology and service
capabilities give it an important advantage in the supermarket sector.

         Historically,  the  supermarket  industry  in  North  America  has been
reluctant to accept EAS for a number of reasons.  Knogo  believes these include:
relatively  high product  turnover,  low average  selling  prices and low profit
margins that have made the cost of targets and tagging appear  prohibitive;  the
belief on the part of  supermarket  management  that theft was a relatively  low
percent  of costs;  and the  desire to not slow the  checkout  process  and thus
increase  labor  expense  or  customer  dissatisfaction.  However,  as bar  code
scanning and other  management and accounting  systems improved in supermarkets,
supermarket managements were able to see that theft of a relatively narrow range
of products,  namely health and beauty  products,  wine and liquor,  cigarettes,
film,  batteries and meats,  were causing most of the loss of margin from theft,
and that  protection  of these  products  could in fact be  economical.  All EAS
suppliers  have  devoted  considerable   resources  to  this  market  area  with
increasingly  positive  results,  measured in terms of the supermarket  industry
trade press,  customer interest and installations.  As the installed base of EAS
systems in supermarkets grows, theft will shift to unprotected stores. This, and
a proven financial return on investment, may increase demand rapidly.

         Knogo's  management  believes  that  its  ability  to  compete  in  the
supermarket sector is enhanced by several factors. First, there is no entrenched
EAS industry leader in this sector because it is a new market  segment.  Second,
Knogo  believes that its  technology  has  feature/benefit  advantages  over the
systems of some of its  competitors.  Third, the supermarket  industry,  for the
most part, is made up of regional  companies which will not need an EAS supplier
that is equally established in all parts of North America.



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<PAGE>

         Knogo believes the library market continues to be a significant  growth
market for  magnetic  technology.  In March 1996,  3M and Knogo  entered  into a
strategic  alliance to provide  universal asset  protection to libraries  across
North  America.  Knogo  believes that this  strategic  alliance will  strengthen
service to library customers.

         The  agreement,  effective  April 1,  1996,  permits  Knogo to act as a
distributor of all of 3M's library  products,  including the 3M  Tattle-Tape(TM)
Security Strips,  detection  systems,  3M SelfCheck System hardware and software
and other 3M library  materials  flow  management  products and  accessories  to
public, academic and government libraries.  In addition,  under the agreement 3M
provides  service  and  installation  for  all new and  existing  Knogo  library
customers throughout North America.

         In September 1995, Knogo and Asset Management  Technologies  ("AMT"), a
loss  prevention  consultant  to the  computer  industry,  signed  an  exclusive
marketing agreement to provide EAS technology services to the computer industry.
Profits in the computer  industry are often  threatened by the theft of computer
components,  processor  chips,  memory  modules  ("SIMMS")  and hard drives.  An
estimated 80% of the thefts are perpetrated by employees  stealing from computer
and computer  component  manufacturers and  distributors.  Knogo and AMT believe
that the  integration  of Knogo's  EAS system  into an overall  loss  prevention
program in the computer industry would  significantly curb such thefts.  Knogo's
marketing efforts in this area include the introduction of SecureBoard(TM) which
Knogo's management believes is the first EAS technology  specifically engineered
to meet the requirements of the computer and electronics industry.

         SecureBoard(TM)  EAS  Technology  extends  Knogo's  expertise  in  loss
prevention  technology  to the computer  and  electronics  industry.  Using this
technology,  licensed  KNOGO  ENABLED(TM)  board  manufacturers  can  embed  EAS
material  into  an  internal   layer  of  a  printed   circuit   board,   making
SecureBoard(TM)  the first EAS system to be compatible  with high volume printed
circuit board  manufacturing  processes.  The resulting board has built-in theft
prevention.  Because the EAS material is deposited onto an internal layer of the
board, it cannot be removed  without  destroying the board.  SecureBoard(TM)  is
also compatible with magnetic detection systems already available from major EAS
manufacturers, including Knogo. Knogo intends to license its technology to these
manufacturers  in return  for  royalty  payments.  No  significant  revenue  was
produced from this market in 1996.

Service

         Installation,  repair and maintenance  services are performed primarily
by Knogo's personnel.  All products sold or leased are covered either by a short
warranty  period  or an  extended  warranty  period.  Knogo  also  offers to its
customers  the option of  entering  into a  maintenance  contract  with Knogo or
paying for service on a per call basis.

Competition

         Knogo  operates  in a highly  competitive  market  with many  companies
engaged in the  business of  furnishing  security  services  designed to protect
against  shoplifting  and theft. In addition to EAS systems using the concept of
tagged merchandise,  such services use, among other things, closed circuit video
systems,  mirrors, guards, private detectives and combinations of the foregoing.
Knogo  competes  principally  on the  basis of the  nature  and  quality  of its
products and the adaptability of these products to meet specific  customer needs
and price requirements.

         To Knogo's  knowledge,  there are several other  companies that market,
directly  or  through  distributors,  EAS  equipment  to  retail  stores  in the
Territory,   of  which   Sensormatic   and  Checkpoint  are  Knogo's   principal
competitors.  Many of Knogo's competitors have far greater financial  resources,
more experienced  marketing  organizations  and a greater number of employees in
the Territory than Knogo.

         In connection  with the Spinoff and  Sensormatic  Merger,  Knogo agreed
with  Sensormatic  that Knogo will not compete with Sensormatic in areas outside
of the Territory through the period ending December 29, 1999.

Patents and Other Intellectual Property

         Knogo  has 24 United  States  and  Canadian  patents  and eight  patent
applications  (four in the United States and four in Canada) relating to (i) the
method and  apparatus  for the detection of movement of articles and persons and
accessory  equipment  employed by Knogo in its Swept RF, Dual RF and MM systems,
(ii)  various  specific  improvements  used in Knogo's  Swept RF, Dual RF and MM
systems and (iii) various electrical theft detection


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<PAGE>

methods,  apparatus and  improvements  not presently  used in any of Knogo's EAS
systems.  Although patent  protection is advantageous to Knogo,  management does
not  consider  any  single  patent or patent  license  owned or held by it to be
material to Knogo's operations,  but believes that Knogo's competitive  position
ultimately  will  depend  on its  experience,  know-how  and  proprietary  data,
engineering,  marketing and service capabilities and business reputation, all of
which are outside the scope of patent protection.

         Sensormatic  and Knogo license  certain patent rights and technology of
the Knogo  Predecessor to each other, for use in their  respective  territories,
pursuant to the License  Agreement  dated  December  29,  1994,  entered into in
connection with the Sensormatic  Merger. In addition,  Sensormatic has rights to
manufacture and sell SuperStrip within the Territory.

Research and Development

   
         At  December 31, 1996,  Knogo had 18 employees  located in the United
States engaged either full or part- time in research and engineering and product
development. Knogo may from time to time retain consultants for specific project
assistance.  Because of the  importance to Knogo of products to better serve the
North American  market and the  improvement of its existing EAS products,  Knogo
engages in company-sponsored research and engineering relating to the completion
of new products and the  improvement of its existing EAS products.  For the nine
month  period  ended  September  30,  1996 and  year  ended  December 31,  1995,
approximately   $1,069,000   and   $1,537,000   respectively   was  expended  on
Knogo-sponsored research.
    

         Knogo is focusing its research,  development and engineering efforts on
those  projects  with the most  potential  for market  growth in the  Territory.
During 1995 and 1996,  Knogo  re-engineered  and newly designed the Knoscape(TM)
line of electronic article  surveillance  systems.  Offered in both magnetic and
radio frequency  versions,  these new systems feature digital signal  processing
and ease of  installation  and  maintenance  and the  aesthetic  design  Knogo's
customers  desire.  Other areas of research include new types of magnetic target
materials  and  its  application  in  the  protection  of  high-theft   computer
components  and the  development  of a new 8 mhz Swept RF system.  In  addition,
Knogo has designed new  accessories  including the deluxe  desktop  deactivator,
dual function hand stamp, Swept RF  verifier/deactivator  and an automatic label
applicator.

Regulation

         Because Knogo's EAS systems use radio transmission and  electromagnetic
wave  principles,  such systems are subject to  regulation  by the FCC under the
Communications  Act of 1934.  In  those  instances  where it has been  required,
certification of such products by the FCC has been obtained. As new products are
developed by Knogo,  application  will be made to the FCC for  certification  or
licensing when required.  No assurance can be given that such  certification  or
licensing will be obtained or that current rules and regulations of the FCC will
not be changed in an adverse manner.

         Knogo  believes it is in material  compliance  with  applicable  United
States,  state and local laws and regulations  relating to the protection of the
environment.

Employees

   
         At December 31, 1996, Knogo employed 238 full-time  employees,  of whom
three were engaged in executive  capacities,  49 in administrative  and clerical
capacities, 18 in engineering, research and development, 77 in production, 35 in
marketing  and  sales  and 51 in  customer  service.  Knogo  believes  that  its
relations  with its employees are good.  None of Knogo's  employees are employed
pursuant to collective bargaining agreements.
    


Director Compensation

         Each  director  receives  a fee of $5,000 per annum and $1,000 for each
meeting attended.

         Under the terms of Knogo's 1994 Stock  Incentive  Plan (the "Knogo 1994
Plan"),  each non-employee  director  receives an automatic,  annual grant of an
option to purchase 2,000 shares of Knogo Common Stock at fair

                                       73
<PAGE>

market value on the date of grant. Each option becomes exercisable  cumulatively
as to 20% of the shares on each of the first five  anniversaries  of the date of
grant and has a duration of 10 years.

Executive Compensation

         The Compensation  Committee of Knogo's Board has the responsibility for
setting  the  compensation  paid to the Chief  Executive  Officer  and for final
approval  of the  compensation  paid to the other  executive  officers of Knogo,
approving or disapproving the recommendation of the Chief Executive Officer. The
Compensation  Committee,  which is comprised of the three non-employee directors
of Knogo,  determines  the  amount of shares and  exercise  prices for any stock
option  grants  under the Knogo  1994 Plan,  and the amount of Knogo's  matching
contribution   percentage   under  Knogo's   Retirement   Savings  401(k)  Plan,
respectively.

         Currently,  Knogo's executive  officers,  including the Chief Executive
Officer, are compensated pursuant to written employment agreements providing for
a base salary.  These agreements provide for annual salary increases intended to
maintain the executive's base salary against  increases in the cost of living as
measured  by the  United  States  Department  of  Labor.  However,  in  lieu  of
cost-of-living  salary increases in 1995, the executive officers,  including the
Chief  Executive  Officer,  received  grants of options to purchase Knogo Common
Stock under the Knogo 1994 Plan.

Stock Option and Other Equity Plans

         The Committee  endorses the view that the value of compensation paid to
its executive officers, and the Chief Executive Officer in particular, should be
closely linked to increases in the value of Knogo Common Stock. Accordingly, the
Committee  supports option awards under the Knogo 1994 Plan and participation by
executive  officers in the  Retirement  Savings  401(k) Plan,  which  includes a
Company  Common  Stock fund among its  investment  alternatives.  A  substantial
portion of the total compensation of the executive officers, including the Chief
Executive Officer, is wholly dependent on increases in the value of Knogo Common
Stock.

         The  number of stock  options  granted  to  executive  officers  is not
determined by reference to any formulas but is  determined  by the  Compensation
Committee's  evaluation  of the  particular  officer's  ability to influence the
long-term  growth and  profitability  of Knogo.  The  Committee  also  considers
Knogo's performance against certain of its competitors,  its general performance
against internal goals established by management,  and the executive's  relative
contribution thereto.


                                       74
<PAGE>

<TABLE>

Summary Compensation Table

         The following table summarizes the compensation for Knogo's fiscal year
ended  December 31, 1995 (Knogo having been  organized  late in 1994) of Knogo's
Chief Executive Officer and each of Knogo's two other executive officers:

<CAPTION>
                                                              Annual                    Long-Term          All Other
                                                           Compensation               Compensation       Compensation(1)
                                                     -----------------------          ------------       ---------------
                                                                                       Securities                              
              Name and                                                                 Underlying        
         Principal Position             Year         Salary($)       Bonus($)          Options (#)                ($) 
         ------------------             ----         ---------       --------          -----------                ---
<S>                                     <C>          <C>                 <C>            <C>                       <C>
Thomas A. Nicolette,                                                                                                           
President and CEO                       1995         $150,000            --             107,000(2)                4,386
Peter J. Mundy,                                                                                                                
Vice President-Finance,                                                                                  
Secretary and Treasurer                 1995         $103,800            --              45,000(2)                3,223
Dr. Peter Y. Zhou,                                                                                                             
Vice President - Technology             1995         $120,000            --              45,000(2)                3,649

<FN>
- --------------
(1)      Amounts  shown  consist of  Knogo's  matching  contributions  under the
         Retirement Savings 401(k) Plan.
(2)      Includes  options  granted  late  in 1994 in  connection  with  Knogo's
         Spinoff from the Knogo Predecessor.
</FN>
</TABLE>

         As to various items of personal benefits,  Knogo has concluded that the
aggregate  amount of such  benefits  with  respect to each  individual  does not
exceed the lesser of $50,000 or 10% of the annual  salary and bonus  reported in
the table for such individual.

<TABLE>

Knogo Options Granted in Last Fiscal Year

         The following table sets forth certain  information  concerning options
granted during 1995 to each executive officer named in the Summary  Compensation
Table under the Knogo 1994 Plan:

<CAPTION>
                                                                                   Potential Realizable Value at
                        Number of                                                    Assumed Annual Rates of
                        Securities     % of                                        Stock Price Appreciation for
                        Underlying     Total                                                  Option
                         Options      Granted                                                 Term ($) 
                         Granted        in        Exercise        Expiration      -------------------------------
         Name              (#)         1995      Price ($)           Date             0%         5%         10%
- -----------------------------------------------------------------------------------------------------------------

<S>                    <C>  <C>           <C>      <C>       <C>                      <C>      <C>        <C>
Thomas A. Nicolette    (1)  100,000       18.9%    $2.00     December 6, 2004         --       125,780    318,750
                              7,000        1.3%    $2.50     January 3, 2005          --        11,005     27,891
                       (2)   47,000        8.9%    $1.72     November 1, 2000         --        26,442     59,871

Peter J. Mundy         (1)   40,000        7.5%    $2.00     December 6, 2004         --        50,312    127,500
                              5,000        0.9%    $2.50     January 3, 2005          --         7,861     19,922
                       (2)   13,500        2.5%    $1.72     November 1, 2000         --         7,595     17,140

Dr. Peter Y. Zhou      (1)   40,000        7.5%    $2.00     December 6, 2004         --        50,312    127,500
                              5,000        0.9%    $2.50     January 3, 2005          --         7,861     19,922
                       (2)    6,000        1.1%    $1.72     November 1, 2000         --         3,376      7,618

<FN>
- ---------------
(1)      Options   granted  in  December  1994  in  connection  with  employment
         agreement.
(2)      Options issued in substitution for Knogo  Corporation  stock options in
         connection with the Spinoff of Knogo from the Knogo Predecessor.
</FN>
</TABLE>

                                       75
<PAGE>

<TABLE>

Knogo Aggregated Option Exercises in Last Fiscal Year and
Fiscal Year End Option Values

         The following table sets forth for each of the named executive officers
the number of options exercised during 1995 and the amount realized by each such
officer.  In  addition,  the table  shows the number of  options  that the named
executive  officer  held as of  December  31,  1995,  both  exercisable  (E) and
unexercisable (U), and the value of such options as of that date.

<CAPTION>
                                                                                 Number of                     Value of
                                                                                Unexercised              Unexercised in-the-
                                                                            Options at Year-End            Money Options at
                                      Shares                                        (#)                      Year-End ($)
                                     Acquired
                                    on Exercise           Value                 Exercisable/                 Exercisable/
             Name                       (#)            Realized ($)            Unexercisable                Unexercisable
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                    <C>                  <C>                    <C>                         <C>
   
Thomas A. Nicolette                    17,000               89,760                 E    50,000                 E   258,400
                                                                                   U    87,000                 U   431,500

Peter J. Mundy                         10,000               52,800                 E    11,500                 E    58,480
                                                                                   U    37,000                 U   182,500

Dr.  Peter Y. Zhou                         --                   --                 E    14,000                 E    71,680
                                                                                   U    37,000                 U   182,500
    
</TABLE>

Knogo Executive Employment Agreements; Change In Control Arrangements

         The employment agreement between Knogo and Mr. Nicolette,  entered into
on  December  29,  1994,  is for a term of three  years,  subject  to  automatic
extensions for successive 24 month periods until terminated by either party. The
agreement provided for Mr. Nicolette's annual compensation at an initial rate of
$150,000 per year, the use of an automobile and the receipt of life insurance in
the amount of $1,000,000.  In connection with his employment, in December, 1994,
Mr. Nicolette also received options under the Knogo 1994 Plan to acquire 100,000
shares of Knogo Common Stock. The options are exercisable at $2.00 per share and
vest over a five year period.  On December 29, 1994, Knogo and Mr. Mundy and Dr.
Zhou  entered  into  employment  agreements  for a term of one year,  subject to
automatic  extension for successive one year periods until  terminated by either
party.  The  employment  agreements of Mr. Mundy and Dr. Zhou provide for annual
salaries of $103,800 and $120,000, respectively. Additionally, Mr. Mundy and Dr.
Zhou  received  options to acquire  40,000  shares each of Knogo Common Stock on
terms similar to those granted to Mr.  Nicolette.  The employment  agreements of
Messrs.  Nicolette  and Mundy and Dr.  Zhou  each  provide  for a cost of living
adjustment to the base annual salary of each  executive  based on the percentage
increase of the Consumer Price Index. Cost of living increases were not taken in
1995 and 1996.

         The employment  agreements of Messrs.  Nicolette and Mundy and Dr. Zhou
provide  that in the event of a Change in  Control  of Knogo,  the term of their
employment will be automatically extended for the period ending two years in the
case of Mr.  Nicolette's  agreement  and  one  year  in the  case  of the  other
agreements,  following the date of such Change in Control. Following such Change
in Control, each of such persons will have the right to terminate his employment
for Good  Reason  while  continuing  to receive  the salary and bonus  otherwise
payable thereunder for the remainder of the employment term.  Additionally,  the
employment  agreements  provide  that in the  event of a Change in  Control  all
options held by each of such  persons,  whether or not then vested,  would fully
vest. If the Change in Control was not approved by a majority of the  Continuing
Directors  (as  defined  in  Knogo's   Amended  and  Restated   Certificate   of
Incorporation),  each  such  officer  would  be  entitled  to  receive  cash  in
cancellation  of such options in an amount equal to the  difference  between the
exercise  price of such options and the market price of Knogo's  Common Stock at
the time of cancellation.


                                       76
<PAGE>

Properties

   
         Knogo's  principal  executive  offices,  East Region  office and United
States  production,  research and  development and  distribution  facilities are
located in  Hauppauge,  New York,  in a 68,000  square foot  facility  leased by
Knogo. Knogo owns a 55,000 square foot manufacturing  facility in Cidra,  Puerto
Rico and a one story building  consisting of approximately  6,000 square feet in
Villa Park, Illinois, where its West Region office is located. Knogo also leases
other  office and  warehouse  space as  required in the  Territory  but does not
regard any of such space as material to Knogo's business.
    

         Knogo, in December 1996, completed a sale/leaseback transaction for its
Hauppauge,  New York facility  resulting in the receipt by Knogo of net proceeds
of approximately $4,500,000.

Legal Proceedings

         Although Knogo is involved in ordinary,  routine litigation  incidental
to its business, it is not presently a party to any other legal proceeding,  the
adverse  determination of which, either individually or in the aggregate,  would
be expected to have a material  adverse affect on Knogo's  business or financial
condition.



                                       77
<PAGE>

                  KNOGO MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                  FINANCIAL CONDITION AND RESULTS OF OPERATIONS


Results of Operations

Nine Months Ended  September 30, 1996 Compared with Nine Months Ended  September
30, 1995

         Consolidated  revenues  were 19% lower in the nine month  period  ended
September  30, 1996 than in the nine month  period  ended  September  30,  1995.
Revenues from  third-party  customers in the current period were  $13,548,000 or
75% of total revenues as compared to $13,327,000 or 60% of total revenues in the
prior year period.  The increase in the current period is attributable to higher
sales in the retail and 3M library market  segments.  Revenues in the first nine
months of 1996 include a new  contract  with a retail  customer.  Under this new
contractual  arrangement,  if certain store shrinkage reductions are met through
the use of Knogo's  equipment over a period of two years,  the contract  revenue
amount would approximate $3 million. If store shrinkage  reductions are not met,
the  customer has the option to purchase the  equipment  for $1.5 million  which
represents  the minimum lease  payments  under the fixed,  non-cancelable  lease
term.  However,  all of the equipment costs have been recorded in the cumulative
nine month period  resulting in a significantly  lower  cumulative  gross margin
associated with that sale. Successful shrinkage reductions will result in future
revenues  with  substantially  no  additional  costs.  Sales  under  the  Supply
Agreement  with  Sensormatic  in the nine month period ended  September 30, 1996
were  $3,990,000  or 22% of total  revenues as compared to  $9,062,000 or 41% of
total  revenues  in the same  period  of 1995.  Under  the  terms of the  Supply
Agreement,  the Company  expected a  reduction  of  approximately  $1 million in
revenues per quarter in 1996 compared to 1995. However, in the nine month period
ending  September 30, 1996,  Sensormatic did not meet its minimum order amounts.
Accordingly,  in accordance with the Supply  Agreement,  the Company recorded in
revenues  $642,000,  which  represents the cumulative  profits on the shortfall.
Sales represented 91% and service and rental income 9% of total revenues in 1996
as compared to 92% and 8% in 1995.

         Cost of sales was 52% of total  revenues in the nine month period ended
September  30, 1996 as compared to 50% in the same period in the previous  year.
The cost of sales percentage is impacted by several  factors,  including the mix
of products  sold to its own  third-party  customers  and the amount of sales to
Sensormatic under the Supply Agreement.  In the nine month period of 1996, Knogo
sold a higher  percentage  of CCVS  equipment  and 3M  library  products  to its
third-party  customers  than in the same period in 1995.  These products are not
manufactured  directly by Knogo and carry lower margins than the traditional EAS
products  it does  produce.  In the first nine  months of 1996 cost of sales was
also  impacted by the higher  initial  costs  recorded on the large  retail sale
noted above.  During 1996,  there was a  substantially  lower amount of sales to
Sensormatic  than in 1995. The gross margin on these sales is fixed at 35% under
the Supply Agreement. Margins on future sales will be dependent upon product mix
and sales volume under the Supply Agreement.

         Customer  service  expenses were lower in the first nine months of 1996
as compared to 1995. This is a result of permanent staff  reductions due to more
efficient  installations  and fewer service calls primarily  attributable to the
transfer of its library maintenance obligations to 3M.

         The  decrease in selling,  general and  administrative  expenses in the
first nine months of 1996 as  compared to 1995 is  primarily a result of ongoing
cost control measures,  lower sales promotional  expenses and lower required bad
debt provisions.

         Research and  development  costs were lower in dollar value in the 1996
period but  substantially  the same as a percentage  of revenues in both periods
presented.   The  1995  period  included  higher  prototype  costs  particularly
associated  with the development of the Express  library  self-patron  check-out
system which was part of the technology sale to 3M in the first quarter of 1996.

         Knogo's  interest  income was  $125,000 in the nine month  period ended
September 30, 1996 as compared to $43,000 in the  corresponding  period in 1995.
The increase is due to the investment of proceeds from the sale of assets at the
end of the first  quarter.  These  amounts are shown net of interest  expense of
$61,000 and $69,000 in the respective 1996 and 1995 periods relating to payments
on capitalized leases for Knogo's computer equipment.



                                       78
<PAGE>

         In 1996,  Knogo sold certain  assets to 3M,  consisting  of patents and
technology,  for a purchase  price of $3 million.  The proceeds,  net of certain
costs including patent costs, inventory write downs, new product training costs,
legal and other costs, resulted in a gain of approximately $2.5 million which is
included in the nine month period of 1996.  See Note 14 of Knogo's  Consolidated
Financial Statements.

         Knogo's  effective tax rate is 25% for 1996 as compared to 15% in 1995.
The  increase  in the rate was  primarily  related to the tax on the gain on the
sale of assets in 1996 which will be taxed at the statutory federal tax rate and
will  represent a significant  proportion  of the taxable  income in the current
year.  The lower rate in 1995 was primarily due to the normal  provisions on the
earnings of the Puerto Rico manufacturing operations.

         As a result of the foregoing, Knogo had net income of $1,991,000 in the
nine months  ended  September 30,  1996 as compared  to  $1,075,000  in the nine
months ended September 30, 1995.

Year Ended December 31, 1995 Compared with Ten Months Ended December 31, 1994

         Knogo was created and its shares distributed to the stockholders of the
Knogo Predecessor as part of a transaction which closed on December 29, 1994. As
a  result,  the  comparable  period  for the prior  year is the 10 months  ended
December  31, 1994.  Knogo has not  adjusted  prior year amounts for purposes of
management's  discussion  and  analysis  due to the  significance  of the  above
transaction on Knogo's operations.  See Note 1 to Knogo's Consolidated Financial
Statements for the basis of presentation of prior year amounts.

         Consolidated  revenues for the year ended  December 31, 1995 were $29.4
million as compared to $20.7  million for the 10 months ended  December 31, 1994
reflecting an increase of $8.7 million over the previous period.

         Sensormatic  purchased  $12 million of product for sale  outside of the
Territory in the year ended December 31, 1995, as agreed in accordance  with the
Supply Agreement (See Note 13b to Knogo's Consolidated Financial Statements). In
the 10 month period ended  December 31, 1994,  sales to the Knogo  Predecessor's
international  affiliates  of $7  million  were  lower  than  in  prior  periods
primarily  due to customer  uncertainties  relating  to the pending  Sensormatic
Merger and  related  transactions.  In  accordance  with the  Supply  Agreement,
minimum revenues from Sensormatic are expected to decrease to $8 million in 1996
and $4 million in 1997.  While  Knogo is amenable to sales of products in excess
of  Sensormatic's  minimum  amounts,  it has  received no firm  commitment  from
Sensormatic  to do so at this time.  Knogo  anticipates  replacing  these future
revenues with continued growth in its core markets with other customers.

         Revenues from customers other than Sensormatic were $3.6 million higher
in the year ended  December 31, 1995 than in the 10 month period ended  December
31, 1994.  During 1995, Knogo increased its penetration into the supermarket and
library markets while sales to the traditional  retail markets  remained strong.
There were no  significant  revenues  from sales to the  computer  manufacturing
industry in 1995.

         Revenues by product line to customers  other than  Sensormatic  in 1995
were 50%  Magnetics,  21% Swept RF, 14% Dual RF, 2% KnoGlo,  3% Express  and 10%
CCVS,  compared to 38%,  34%, 15%, 2%, 0% and 11%  respectively  in the 10 month
period ended  December 31, 1994.  Revenues from sales to  Sensormatic by product
line were 57% MM,  40% Swept  RF, 0% Dual RF and 3% KnoGlo as  compared  to 56%,
40%, 3% and 1%  respectively in sales to the Knogo  Predecessor's  affiliates in
the 10 month period ended December 31, 1994.

         Cost of security  devices  sold,  as a percentage  of sales of security
devices and related interest income,  remained  constant at 45% in both the year
ended  December 31, 1995 and the 10 months  ended  December 31, 1994 despite the
increase in product mix towards MM.  Traditionally,  the MM product line carried
lower margins than the Swept RF products.  However,  during 1995, Knogo was able
to improve  the margin on MM through a  combination  of higher  selling  prices,
particularly  through higher library  sales,  as well as lower costs  associated
with product design changes and overall manufacturing efficiencies.

         In accordance with the Supply  Agreement,  sales to Sensormatic in 1995
were priced to yield a 35% gross  margin.  In the 10 months  ended  December 31,
1994 cost of sales to affiliates was variable based on product mix.

         Customer  service  expenses include the costs of installing new systems
and maintaining  previously installed systems.  Total expenses were lower in the
year ended December 31, 1995 than in the 10 months ended


                                       79
<PAGE>

December  31,  1994  due  to a  reduction  in the  number  of  customer  service
engineers, a greater utilization of their time and cost cutting measures related
to their travel.

         Selling, general and administrative expenses in the year ended December
31, 1995 were $1.3 million lower than in the 10 month period ended  December 31,
1994.  The reduction is a result of a decrease in executive  and  administrative
staff,  lower employee benefit costs,  budgeted expense reductions and lower bad
debts provisions.  The prior 10 month period also included  allocated  corporate
costs  including  costs  related to the  Sensormatic  Merger of  $1,575,000  and
$186,000 of the death benefit paid to the estate of a former executive.

         Research  and  development  increased  by $1.1 million in 1995 over the
allocated  costs in the 10 month period ended December 31, 1994. In 1995,  Knogo
directed 100% of its research and engineering  efforts towards  products for the
North American market. As a result of these efforts,  Knogo has been introducing
in 1996 a  re-engineered  and newly  designed  Knoscape(TM)  line of  electronic
article  surveillance   systems.   Ongoing  existing  product  development  also
contributed towards lower costs, primarily in the Magnetics product line, during
the year.

         Interest  expense  relates to certain  capitalized  computer and office
equipment  leases in both periods and is shown net of interest income of $59,000
in 1995 and $7,000 in 1994.

         Knogo had an effective tax rate in 1995 of 11% primarily as a result of
the tax benefits  associated with the earnings of the Puerto Rico  manufacturing
operations.  In the 10 months  ended  December  31,  1994,  the tax  benefit was
primarily the result of the  settlement  of previous  years tax audits offset by
the  normal  provisions  on  the  earnings  of  the  Puerto  Rico  manufacturing
operations.

         As a result of the foregoing, Knogo had net income of $1,731,000 in the
year ended  December  31, 1995  compared to a net loss of  $2,833,000  in the 10
month period ended December 31, 1994.

Ten Months Ended  December 31, 1994  compared  with the Year Ended  February 28,
1994

         Consolidated  revenues for the 10 months  ended  December 31, 1994 were
$20.7 million as compared to $29.6 million for the year ended February 28, 1994,
reflecting a decrease of $8.9 million over the previous period.

         Revenues from third party  customers  were lower due to a plan that was
put in place  in the  previous  year to  reduce  the  number  of  sales  account
representatives to more sharply focus the selling effort on targeted markets and
to reduce expenses. The short term effect of this plan was a decline in revenues
from  traditional  sources,  particularly  in soft  goods,  which  were  not yet
replaced by revenues from the  redirected  effort.  In response to the increased
selling  effort and trade  advertising,  systems  were placed in 33  supermarket
locations  on either a test or trial  order  basis  during  the 10 months  ended
December 31, 1995.  Successful conversion of many of these tests and trials into
revenue producing orders began in the calendar 1994 year.

         Sales to affiliates were lower in the 10 months ended December 31, 1994
compared  to the year  ended  February  28,  1994 for  various  reasons.  In the
beginning of the year, Knogo experienced  certain technical problems relating to
the improved magnetic systems developed for supermarkets  resulting in the delay
of orders.  In the latter  part of the period  the  reduction  continued  due to
customer  uncertainties  relating to the pending  Sensormatic Merger and related
transactions.

         Revenues  by  product  line to third  party  customers  in the 10 month
period ended December 31, 1994 were 38% Magnetics, 34% Swept RF, 15% Dual RF, 2%
KnoGlo(TM),  and 11% CCVS, compared to 32%, 36%, 19%, 3%, and 10%, respectively,
in fiscal  1994.  Revenues  from sales to  affiliates  by product line in the 10
month period  ended  December 31, 1994 were 56% MM, 40% Swept RF, 3% Dual RF, 1%
KnoGlo(TM)  and 0% CCVS compared to 64%, 31%, 1%, 3%, and 1%,  respectively,  in
fiscal 1994.

         As a  percentage  of sales of security  devices  and  related  interest
income,  the cost of security  devices sold decreased from 47% in fiscal 1994 to
45% in the 10 months ended December 31, 1994.  Increased  margins primarily were
due to higher selling  prices in the CCVS product line,  lower costs and product
improvements in Magnetics and lower inventory provisions.



                                       80
<PAGE>

         Customer  service  expenses,  while lower in the 10 month period due to
lower sales volumes, would have been slightly higher on an annualized basis than
in the previous  fiscal year.  This was primarily a result of the learning curve
associated with new installations in the supermarket sector.

         Cost of sales to affiliates  increased to 71% in the current  period as
compared  to 65% in fiscal  1994  primarily  as a result of the change in mix of
products sold.

         Selling,  general and  administrative  expenses in the 10 month  period
ending  December 31, 1994 were $321,000  higher than in the year ended  February
28, 1994. The increase was due to higher allocated  corporate  costs,  including
costs of $1,575,000  related to the Sensormatic  Merger and a portion ($186,000)
of the death  benefit  payable  to the  estate of Arthur J.  Minasy,  the former
Chairman of the Board and Chief Executive  Officer of the Knogo  Predecessor who
died in May 1994.  Knogo also incurred higher sales  promotion costs  associated
with  development  of new  products  intended  for the  supermarket  and library
markets. These costs were offset in part by reductions in the sales staff.

         Allocated  research  and  development  costs  were  lower  than  in the
previous fiscal year due to a greater effort of the Knogo Predecessor's research
department placed on the development of products for the European marketplace.

         Interest  expense was lower in the current  fiscal  period  because the
amount included in fiscal 1994 included  interest  relating to the settlement of
various tax audits.

         Knogo's tax benefit in the 10 month period ended  December 31, 1994 and
tax  provision  in the year ended  February  28, 1994 were related to the normal
provisions on the earnings of the Puerto Rico manufacturing  operations,  offset
by settlements of previous years tax audits.

         As a result of the foregoing, Knogo had a net loss of $2,833,000 in the
10 months  ended  December  31, 1994  compared to a net profit in fiscal 1994 of
$123,000.

Liquidity and Capital Resources

         Knogo's  financial  position is strong,  with $2.5  million in cash and
cash equivalents,  shareholders' equity of approximately $25 million and no bank
debt. In addition, Knogo's working capital increased by $3.1 million in the nine
months ended September 30, 1996.

         Knogo has a $5 million unused and unsecured  revolving  credit and term
loan  agreement  which is  described  more  fully in Note 9 to the  Consolidated
Financial   Statements   of  Knogo   included   elsewhere  in  the  Joint  Proxy
Statement/Prospectus.  During the year, Knogo was able to fund substantially all
of its working  capital  needs and capital  expenditures  through  existing cash
resources and the proceeds from the sale of assets of 3M.

         Knogo's Supply Agreement with Sensormatic is scheduled to expire by its
terms on June 30, 1997. Since entering into the Supply Agreement on December 29,
1994, Knogo has generated a significant portion (41% in 1995 and 22% in the nine
months ended September 30, 1996) of its revenues from production of EAS products
for sale to  Sensormatic  pursuant  to the  Supply  Agreement.  There  can be no
assurance that Knogo will be able to renew the terms of the Supply  Agreement or
to  otherwise  succeed  in  expanding  its sales  sufficiently  to  replace  the
manufacturing  and sales volume it will lose upon the  expiration  of the Supply
Agreement.  Consequently,  Knogo  may  have  difficulty  maintaining  profitable
margins in its manufacturing operations.

         At, or shortly after, the consummation of the Merger, Sentry intends to
enter into a new credit arrangement with Knogo's present lender, Fleet Bank, and
thereafter to make advances to each of Video and Knogo as the  businesses of the
two subsidiaries may require. Knogo's current bank credit facility consists of a
$5 million  dollar line of credit with Fleet Bank which,  by its current  terms,
would be  terminated  upon  consummation  of the  Merger.  However,  based  upon
discussions  between  Knogo's  management and senior  lending  officers at Fleet
Bank,  Sentry believes that a new facility will be made available to it, to take
effect after the Merger,  for at least the same amount, and on substantially the
same terms, as are currently  available to Knogo. Such facility would be secured
by a lien on substantially all of the assets of Sentry and its subsidiaries.  In
December 1996, Knogo completed a sale-leaseback  arrangement with respect to its
Hauppauge, New York facility,  resulting in the receipt by Knogo of net 



                                       81
<PAGE>

proceeds of approximately  $4.5 million.  It is expected that Knogo will make an
advance of $2 million out of the proceeds from the sale/leaseback transaction to
Video upon  consummation of the Merger to permit Video to repay certain existing
indebtedness.

         Despite the expiration of the Supply Agreement,  Knogo anticipates that
current cash reserves,  cash generated by operations and cash obtained under the
bank credit  facility  expected to be entered into by Sentry will be adequate to
finance  Knogo's  anticipated  working  capital  requirements  as well as future
capital expenditure requirements for at least the next 12 months.

Inflation

         Knogo does not  consider  inflation  to have a  material  impact on the
results of operations.

Recent Accounting Pronouncements

         In October 1995,  the Financial  Accounting  Standards  Board  ("FASB")
issued Statement No. 123, "Accounting for Stock-Based  Compensation," which must
be adopted by Knogo in fiscal 1996.  Knogo has chosen not to implement  the fair
value based  accounting  method for employee stock  options,  but has elected to
disclose,  commencing  with its fiscal  1996  Annual  Report,  the pro forma net
income and net income per share as if such  method had been used to account  for
stock-based compensation costs as described in Statement No. 123.


                                       82
<PAGE>

                 KNOGO SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
                              OWNERS AND MANAGEMENT

         At the close of business on December  31, 1996,  Knogo had  outstanding
5,772,632  shares of Common  Stock,  par value  $0.01 per  share,  each of which
entitles the holder to one vote. Voting is not cumulative.

<TABLE>
         The following  table provides  information  at December 31, 1996,  with
respect  to (i) any  person  known to Knogo to be the  beneficial  owner of five
percent or more of the  shares of Knogo  Common  Stock,  (ii) each  director  of
Knogo,  (iii) each of the three  executive  officers and (iv) all  directors and
executive  officers as a group.  For the purpose of computing the  percentage of
the shares of Knogo  Common  Stock owned by each person or group  listed in this
table,  any  shares not  outstanding  which are  subject to options  exercisable
within 60 days have been  deemed to be  outstanding  and owned by such person or
group,  but have not been deemed to be outstanding  for the purpose of computing
the  percentage  of the shares of Knogo Common Stock owned by any other  person.
This table does not include options which will vest as a result of the Merger.

<CAPTION>
             Name and Address of                       Amount and Nature of
               Beneficial Owner                      Beneficial Ownership (1)               Percent of Class
               ----------------                      ------------------------               -----------------
<S>                                                       <C>                                      <C>
   
Walter & Edwin Schloss Associates L.P.                                                                               
      52 Vanderbilt Avenue                                                                                           
      New York, New York 10017                              641,500(2)                             11.1%
    

Dimensional Fund Advisors                                                                                        
      1299 Ocean Avenue                                                                                          
      Suite 650                                                                                                  
      Santa Monica, California 90401                        337,900(3)                              5.9%

Frank M. Corso                                               15,900(4)                               *

William A. Perlmuth                                                                                              
      c/o Stroock & Stroock & Lavan                                                                              
      7 Hanover Square                                                                                           
      New York, New York 10004                            1,077,227(5)                             18.2%

Robert E. Vandermark                                         15,520(4)                               *

Thomas A. Nicolette                                         208,574(6)                              3.5%

Peter Y. Zhou                                                33,433(7)                               *

Peter J. Mundy                                               44,690(8)                               *

All directors and executive officers as a
      group (6 persons)                                   1,392,344(9)                             23.5%


<FN>
- ---------------------------
*        Less than one percent.
(1)      Unless otherwise indicated,  beneficial ownership disclosed consists of
         sole voting and investment power.
(2)      Includes  8,500  shares  beneficially  owned  solely  by  Mr. Walter J.
         Schloss and 7,000  shares  beneficially  owned  solely by  Mr. Edwin W.
         Schloss.
(3)      According to  information  provided by  Dimensional  Fund Advisors Inc.
         ("Dimensional"),  Dimensional is a registered investment advisor and is
         deemed to have  beneficial  ownership of shares of Knogo,  all of which
         shares are held in portfolios of DFA Investment  Dimensions Group Inc.,
         a registered  open-end  investment  company,  the DFA Investment  Trust
         Company, a registered  open-end  investment  company,  or the DFA Group
         Trust and the DFA Participating  Group Trust,  investment  vehicles for
         qualified  employee benefit plans, all of which  Dimensional  serves as
         investment manager.  Dimensional disclaims beneficial ownership of such
         shares.
(4)      Includes  14,400  shares  issuable  upon the exercise of stock  options
         exercisable within 60 days from the date hereof.
(5)      Consists of (a) 902,527 shares held by Mr.  Perlmuth as Executor of the
         Estate of Arthur J. Minasy,  (b) 156,300 shares held by Mr. Perlmuth as
         trustee under trusts for the benefit of Mr.  Minasy's  adult  children,
         and (c) 4,000 shares beneficially owned by Mr. Perlmuth.  Also includes
         14,400 shares  issuable upon the exercise of stock options  exercisable
         within 60 days from the date hereof. Under the policies of the law firm
         of which he is a member,  Mr. Perlmuth will share any economic benefits
         of the options with the other members of such firm.
(6)      Excludes  50,000  shares  held  by a  trust  for  the  benefit  of  Mr.
         Nicolette's wife, as to which shares Mr. Nicolette disclaims beneficial
         ownership.  Includes 90,000 shares held by  Mr. Nicolette as co-trustee
         under  trusts  for the  benefit of his minor  children  and as to which
         shares  Mr. Nicolette  disclaims  beneficial  ownership.  Also includes
         71,400 shares  issuable upon the exercise of stock options  exercisable
         within 60 days from the date hereof.
(7)      Includes  17,000  shares  issuable  upon the exercise of stock  options
         exercisable within 60 days from the date hereof.
(8)      Includes  20,500  shares  issuable  upon the exercise of stock  options
         exercisable within 60 days from the date hereof.
(9)      Includes  152,100  shares  issuable  upon the exercise of stock options
         exercisable within 60 days from the date hereof.

</FN>
</TABLE>


                                       83
<PAGE>

                          CERTAIN TRANSACTIONS OF KNOGO

         During the fiscal year ended  December 31, 1995,  the firm of Stroock &
Stroock &  Lavan,  of which  William A.  Perlmuth,  a director of Knogo (and the
Executor of the Minasy Estate, a principal  stockholder of Knogo),  is a member,
rendered  services  as  general  counsel  to Knogo  and  received  fees for such
services.  During such period Frank  Mitchell  Corso,  P.C., a law firm of which
Mr. Frank  M. Corso,  a director of Knogo,  is a partner,  also  rendered  legal
services to Knogo and received fees for such services. The fees received by each
law firm  constituted  less than 5% of the gross revenues  received by such firm
during its most recent fiscal year.  Mr.  Perlmuth and Mr. Corso each also serve
on the Compensation Committee of the Knogo Board.



                                       84
<PAGE>

                               BUSINESS OF SENTRY

         Sentry,  the newly formed holding  company of Video and Knogo,  has not
conducted  any business  activities  to date,  other than those  incident to its
formation, its execution of the Merger Agreements and related agreements and its
participation  in the  preparation  of this  Joint  Proxy  Statement/Prospectus.
Immediately  following  the  consummation  of the  Merger,  Sentry will become a
holding  company  for  Video  and  Knogo  and  their  respective   subsidiaries.
Accordingly, the business of Sentry, through its wholly-owned subsidiaries Video
and Knogo and their respective  subsidiaries,  will be the businesses  currently
conducted by Video and Knogo and their respective subsidiaries. See "Business of
Video" and "Business of Knogo."

         It is expected that by combining the businesses and operations of Knogo
and Video,  Sentry will be able to offer a more  comprehensive  product  line of
security-related  products  than  either  company  could  alone.  In addition to
benefiting  from the  consolidation  of Knogo's  existing  EAS product line with
Video's traveling CCTV system,  the combined company is expected to benefit from
several  potential  synergies  between the two businesses and their  operations.
Sentry  believes  that Knogo has an  operational  infrastructure  that Knogo and
Video,   collectively,   can  exploit  to  permit  Video's  products,   and  any
enhancements thereto, to more rapidly achieve success in the marketplace. Sentry
believes that Knogo's  operating  infrastructure  is currently  underutilized by
Knogo's existing product offerings.  Sentry believes that, at present, Knogo can
easily promote and offer new products within its existing operational  capacity.
In addition,  although Knogo has been  increasing its  third-party  sales,  such
sales may not grow as  rapidly  as  necessary  for Knogo to  utilize  its excess
operational  and  manufacturing  capacity,  particularly  after  Knogo's  Supply
Agreement  with  Sensormatic  terminates in June 1997. See "Business of Knogo --
Production"  and  "Business of Knogo --  Competition."  In this  regard,  Sentry
expects  that  through  a  consolidation  of  Knogo's  extensive  manufacturing,
marketing  and   distribution   capacities  with  those  of  Video,   Knogo  can
fundamentally assist Video with the production and sale of Video's products. For
example,  Sentry believes that it will be able to use the existing  installation
and service personnel of Knogo located throughout the United States,  Canada and
Puerto Rico,  thereby avoiding some of the employee  transportation  and housing
costs  associated  with each  installation.  Sentry also  believes that by using
Knogo's  excess  manufacturing  capacity to  manufacture  components  of Video's
systems,  Sentry will be able to reduce the number of components manufactured by
contract  manufacturers  and increase the quality of  manufacture as well as the
manufacturing margin realized on its goods.

         In  addition  to  exploiting  the  synergies   resulting  from  Knogo's
operational and manufacturing  capacities,  Sentry believes that Knogo can offer
Video access to Knogo's technological expertise.  Sentry believes that Knogo can
readily adapt the technological  expertise that it has developed in the EAS area
to assist  Video in the  research  and  development  of further  innovations  to
Video's  existing CCTV product line.  Due to Knogo's  resources,  it may well be
able to assist Video in  developing  more  innovative  and cost  effective  CCTV
solutions for the benefit of both of their customers.

         Sentry  believes that the Knogo and Video  businesses  complement  each
other.  As a combined  entity,  Sentry will permit  Video and Knogo  access to a
wider array of products and customers in the anti-theft and security  fields and
the resources with which to exploit the increased sales of such products to such
customers.  Moreover, Sentry expects that, as a combined entity, it will benefit
from general  economies of scale and  reduction  of  inefficiencies  in areas of
duplicative or underutilized operations.  The combination of Knogo's and Video's
businesses is, therefore, expected to accelerate the strategic growth plans, and
eventually the revenues, of both companies.



                                       85
<PAGE>

<TABLE>
                              MANAGEMENT OF SENTRY

Directors

         The following  table sets forth  information  as to the persons who are
expected to serve as directors of Sentry following the Merger.

<CAPTION>
                                                                      Business Experience During the
               Name                   Age                          Past Five Years and Other Information
               ----                   ---                          --------------------------------------
<S>                                   <C>         <C>    
William A. Perlmuth................   67          Has been a director of Knogo since its inception.  Prior thereto, Mr.
                                                  Perlmuth served as a director of the Knogo Predecessor from 1979
                                                  to December 1994.  Mr. Perlmuth has been a partner in the law
                                                  firm of Stroock & Stroock & Lavan in New York, New York for
                                                  more than five years.  Such firm and Mr. Perlmuth have performed
                                                  legal services for Knogo since its inception and are expected to
                                                  perform legal services for Sentry following the Merger.  The
                                                  aggregate amount of fees paid by Knogo to Stroock & Stroock &
                                                  Lavan was less than 5% of the law firm's gross revenues for the
                                                  last fiscal year.  Knogo believes that the billing rates for the
                                                  foregoing legal services were no less favorable to Knogo than could
                                                  have been obtained from unaffiliated parties for comparable
                                                  services.

Thomas A. Nicolette................   46          Has been President, Chief Executive Officer and a director of
                                                  Knogo since its inception in August 1994.  Prior thereto, Mr.
                                                  Nicolette served in various capacities at the Knogo Predecessor,
                                                  where he was Chief Executive Officer from May 1994 to December
                                                  1994; President and Chief Operating Officer from 1990 to May
                                                  1994; President of the North America Division from 1989 to 1990;
                                                  Vice President from 1986 to 1990; and a Director from 1987 to
                                                  December 1994.  Mr. Nicolette is a member of the Board of
                                                  Trustees of WLIW, the Long Island-based affiliate of the Public
                                                  Broadcasting System.

Robert D. Furst, Jr................   44          Has been a director of Video since January 1993, Chairman of the
                                                  Board since July 1996 and Chief Executive Officer since August
                                                  1996.  Mr. Furst was one of the original shareholders of Video.  He
                                                  is the founder and owner of Furst Capital Management, a firm
                                                  specializing in trading government and equity securities as well as
                                                  commodity futures.  Mr. Furst is a member of the Chicago Board
                                                  of Trade and has been a securities and commodities trader since
                                                  1980.  Mr. Furst currently serves on the Boards of Directors of
                                                  NOW Technologies, Inc., a privately-held manufacturer of chemical
                                                  packaging and dispensing systems serving the semiconductor
                                                  industry; Lucht, Inc., a privately-held manufacturer of high volume
                                                  photographic printers and other equipment; and Neighborhood
                                                  Marketing Corporation, a privately-held consumer promotion and
                                                  data base marketing company utilizing proprietary patented
                                                  technologies.



                                       86
<PAGE>

Andrew L. Benson...................   41          Is the founder and President of Video, served as it Chairman of the
                                                  Board between 1990 and July 1996 and its Chief Executive Officer
                                                  between 1990 and 1995, and has been a director of Video since its
                                                  inception.  Mr. Benson served as Video's Treasurer until June 1994
                                                  and Secretary until August 1994.  From May 1988 to August 1990,
                                                  Mr. Benson was President of Assets Protection, Inc., a Minnesota
                                                  private detective agency which he founded.  From 1983 to 1988,
                                                  Mr. Benson held several security-related management positions with
                                                  various companies, including Pinkerton, Inc. and Norwest Bank
                                                  Minnesota, N.A., Minneapolis, Minnesota.

Robert L. Barbanell................   66          Has been President of Robert L. Barbanell Associates, Inc., a
                                                  financial consultancy firm, since July 1994.  Prior thereto, Mr.
                                                  Barbanell served in various capacities at Bankers Trust New York
                                                  Corporation, where he was Managing Director of the European
                                                  Merchant Bank of Bankers Trust International PLC from 1991 to
                                                  1994; Managing Director of BT Securities Corporation from 1989
                                                  to 1991; Managing Director of Bankers Trust Company from 1986
                                                  to 1989; Senior Vice President of Bankers Trust Company from
                                                  1981 to 1986.  Prior to his service with Bankers Trust, Mr.
                                                  Barbanell served in various executive capacities at Amcon Group,
                                                  Inc. and GI Export Corporation. Mr. Barbanell currently serves on
                                                  the Boards of Directors of Marine Drilling Companies, Inc., Kaye
                                                  Group, Inc. and Cantel Industries, Inc.
</TABLE>

   
         The term of office of Mr.  Barbanell  will  expire at  Sentry's  annual
meeting  of  stockholders  to be held in 1998.  The terms of  office of  Messrs.
Benson and Perlmuth will expire at Sentry's annual meeting of stockholders to be
held in 1999 and of  Messrs.  Furst  and  Nicolette  at the  annual  meeting  of
stockholders to be held in 2000.
    


Compensation of Directors

         Directors  who are also  full-time  employees of Sentry will receive no
additional  compensation  for their  services as  directors.  Each  non-employee
director  will  initially  receive  $12,000  annually for services on the Sentry
Board  and  $1,000  per  Sentry  Board  meeting  attended.  In  addition,   each
non-employee director who is a member of any committee of the Sentry Board shall
receive  $500 for  attendance  at any  meeting of such  committee  which is held
neither  immediately  before  nor  immediately  after a  Sentry  Board  meeting;
provided,  however, that the chairman of the compensation and audit committee of
the Sentry Board shall receive $1,000 for attendance at any such separately held
meeting of the  compensation  and audit committee and $500 for attendance at any
meeting of such committee held either  immediately before or immediately after a
Sentry Board meeting.

   
         In addition, each non-employee director will be eligible to participate
in the 1997 Stock  Incentive Plan of Sentry.  Pursuant to this plan,  options to
purchase  15,000  shares of Sentry  Common  Stock  will be  granted to each such
director  at the time such  director  first  joins  the  Sentry  Board.  Messrs.
Perlmuth, Furst and Barbanell are each expected to be granted such options as of
the  Effective  Time.  In addition,  thereafter,  options to purchase  shares of
Sentry Common Stock may be granted to any of the directors at the  discretion of
the Sentry  Board.  All such  options  will be granted at fair market  value and
become  exercisable  over five years  beginning on the first  anniversary of the
date of grant.
    

Committees of the Board of Directors

   
         The Sentry Board of  Directors  will have two  standing  committees:  a
Compensation  Committee  and an  Audit  Committee.  At least a  majority  of the
members of the Audit  Committee  shall be  Directors  of Sentry who are  neither
officers nor employees of Sentry.
    


                                       87
<PAGE>

<TABLE>

Officers

         Set forth  below are the names and titles of certain of the persons who
are expected to serve as executive officers of Sentry following the Merger.

<CAPTION>
                Name                   Age                                      Office
                ----                   ---                                      ------
<S>                                    <C>          <C>    
Thomas A. Nicolette.................   46           President and Chief Executive Officer of Sentry.  Mr. Nicolette has
                                                    been President, Chief Executive Officer and a director of Knogo
                                                    since its inception in August 1994 and continues in those positions.
                                                    Prior thereto, Mr. Nicolette served in various capacities at the Knogo
                                                    Predecessor, where he was Chief Executive Officer from May, 1994
                                                    to December, 1994; President and Chief Operating Officer from 1990
                                                    to May, 1994; President of the North America Division from 1989 to
                                                    1990; Vice President from 1986 to 1990; and a Director from 1987
                                                    to December, 1994.  Mr. Nicolette is a member of the Board of
                                                    Trustees of WLIW, the Long Island-based affiliate of the Public
                                                    Broadcasting System.


Andrew L. Benson....................   41           Vice President, CCTV Systems of Sentry.  Mr. Benson has been
                                                    President and a director of Video since its inception and continues in
                                                    those positions, and served as it Chairman of the Board between
                                                    1990 and July 1996 and Chief Executive Officer between   1990 and
                                                    1995. Mr. Benson, a director of Video, served as Video's Treasurer
                                                    until June 1994 and Secretary until August 1994.  From May 1988 to
                                                    August 1990, Mr. Benson was President of Assets Protection, Inc., a
                                                    Minnesota private detective agency which he founded.  From 1983 to
                                                    1988, Mr. Benson held several security-related management positions
                                                    with various companies, including Pinkerton, Inc. and Norwest Bank
                                                    Minnesota, N.A., Minneapolis, Minnesota.


Peter J. Mundy......................   40           Chief Financial Officer of Sentry.  Mr. Mundy has been Vice
                                                    President - Finance, Chief Financial Officer, Secretary and Treasurer
                                                    of Knogo since December 1994 and continues in those positions.
                                                    Prior thereto, Mr. Mundy served as an officer of the Knogo
                                                    Predecessor, where he was Vice President-Corporate Controller from
                                                    May 1994 and, prior to such time, Corporate Controller for more
                                                    than five years.  Mr. Mundy is a Certified Public Accountant.


Peter Y. Zhou.......................   57           Vice President - Technology of Sentry.  Dr. Zhou has been Senior
                                                    Vice President - Technology of Knogo since December 1994 and
                                                    continues in that position.  Prior thereto, Dr. Zhou served as an
                                                    officer of the Knogo Predecessor where he was Senior Vice
                                                    President-Technology from 1992 and Vice President-Research from
                                                    1988.

</TABLE>

Sentry Employment Agreements and Compensation of Executive Officers

         As of the  Effective  Time,  the  employment  agreements  with Knogo of
Messrs.  Nicolette and Mundy and Dr. Zhou will  terminate and it is  anticipated
that new  employment  agreements  will be  entered  into with  Sentry by each of
Messrs.  Nicolette and Mr. Mundy and Dr. Zhou, on substantially similar terms to
those contained in their 


                                       88
<PAGE>

current  employment  agreements with Knogo.  In addition,  Sentry and Mr. Benson
have agreed in principle to enter into an employment  agreement on terms similar
to those contained in the agreements with Mr. Mundy and Dr. Zhou.

   
         The employment  agreement  between Sentry and Mr. Nicolette is expected
to be for a term of four  years.  In addition to  establishing  Mr.  Nicolette's
annual  compensation  of $200,000  per year,  together  with an  opportunity  to
receive  up  to  an   additional   50%  of  such  amount,   based  upon  certain
performance-based  criteria,  the use of an  automobile  and the receipt of life
insurance in the amount of $1,000,000, the agreement is expected to provide that
Sentry will grant to Mr.  Nicolette  options to acquire 100,000 shares of Sentry
Common  Stock,  with such options  vesting at 20% per annum during the five year
period commencing on the date of the grant thereof. The employment agreements of
Messrs.  Benson and Mundy and Dr. Zhou are each expected to be for a term of two
years.  The  employment  agreements  of Mr.  Mundy and Dr. Zhou are  expected to
provide for annual salaries of $120,000 and $130,000,  respectively. In addition
to their  annual  salaries,  Mr.  Mundy and Dr.  Zhou shall each be  entitled to
receive  options to purchase  40,000 shares of Sentry  Common  Stock,  with such
options  vesting at 20% per annum during the five year period  commencing on the
respective dates of grant thereof. Mr. Benson's agreement is expected to provide
for an annual  base salary in an amount  equal to one percent  (1%) of the gross
sales of Sentry's  CCTV  division up to the  budgeted  amount for such  division
established yearly by the Sentry Board,  together with an opportunity to receive
an  additional  0.2% of the gross  sales of the CCTV  division  based on certain
performance-  based  criteria.  Mr.  Benson  shall have the option to receive an
advance  against his base salary of up to $125,000 per annum. In addition to his
salary, Mr. Benson shall be entitled to receive options to acquire 50,000 shares
of  Sentry  Common  Stock,  with (x) 50% of such  options  vesting  on the first
anniversary  of the grant  thereof  and (y) the  remaining  50% of such  options
vesting  (i) on  the  second  anniversary  of the grant  thereof if the sales of
Sentry's CCTV  division  meet or exceed the amount  budgeted by the Sentry Board
for Mr.  Benson's first year of employment  with Sentry or (ii) at 20% per annum
during the four year period following such first  anniversary if such CCTV sales
do not  exceed  such  budgeted  amount.  The  employment  agreements  of Messrs.
Nicolette  and Mundy and Dr.  Zhou each are  expected  to provide  for a cost of
living  adjustment to the base annual salary of each such  executive  calculated
based upon the  percentage  increase of the Consumer  Price Index (as defined in
such agreements).
    

         The employment  agreements of Messrs.  Nicolette,  Benson and Mundy and
Dr.  Zhou are  expected  to provide  that in the event of a change in control of
Sentry, the term of each of their employment will be automatically  extended for
the period  ending two years in the case of Mr.  Nicolette's  agreement  and one
year in the case of each of the  other  agreements,  following  the date of such
change in control.  Following such change in control,  each of such persons will
have the right to terminate his employment  for good reason while  continuing to
receive the salary and bonus otherwise  payable  thereunder for the remainder of
the employment  term.  Additionally,  the employment  agreements are expected to
provide  that in the event of a change in control  all  options  held by each of
such  person,  whether or not then  vested,  would fully vest.  If the change in
control was not approved by a majority of the Existing  Directors (as defined in
the Sentry Certificate of Incorporation), each such officer would be entitled to
receive  cash  in  cancellation  of  such  options  in an  amount  equal  to the
difference  between the  exercise  price of such options and the market price of
Sentry's Common Stock at the time of cancellation.

Sentry 1997 Stock Incentive Plan

   
         As  of  the  Effective  Time,  Sentry  will  have  adopted  the  Sentry
Technology  Corporation  1997 Stock  Incentive  Plan (the "1997  Plan") which is
comparable to Knogo's current 1994 Stock  Incentive Plan.  Pursuant to the terms
of the 1997 Plan,  an aggregate of 2,250,000  shares of Sentry Common Stock will
be issuable  upon the exercise of options  granted or which may be granted under
such  Plan.  Pursuant  to the Merger  Agreement,  at the  Effective  Time of the
Merger,  options  to  purchase  370,000  shares of Sentry  Common  Stock will be
substituted  for existing Video employee stock options,  and options to purchase
564,548  shares of Sentry  Common  Stock and  564,548  shares of Sentry  Class A
Preferred  Stock will be substituted  for existing Knogo employee stock options.
The following is a summary of the principal provisions of the 1997 Plan.
    

General

         The purpose of the 1997 Plan is to encourage Sentry's key employees and
directors  to acquire a larger  proprietary  interest in Sentry,  and to provide
incentives  to put forth maximum  efforts for the success of Sentry's  business,
and  thereby  stimulate  the  efforts of such key  employees  and  directors  on
Sentry's behalf.

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<PAGE>

         The 1997 Plan is administered  by the Sentry Board.  All key employees,
as may be  determined  by the Sentry  Board from time to time,  are  eligible to
participate in the 1997 Plan.  Under the 1997 Plan,  directors of Sentry who are
not also employees of Sentry are eligible to receive awards under the 1997 Plan;
however,   no  member  of  the  Sentry  Board  may  vote  with  respect  to  any
determination  that  relates to an award to be granted  to, or which is held by,
such member (unless the determination  relates to all outstanding  awards of the
same type).

         Awards may be granted by the Sentry  Board to  eligible  employees  and
directors in the form of stock options,  restricted stock awards,  phantom stock
awards or stock appreciation rights ("Incentive  Awards").  Stock options may be
granted as "incentive  stock options" (as defined under Section 422 of the Code)
or as non-qualified  stock options (except that incentive stock options can only
be granted to employees).

   
         The  aggregate  number of shares of Sentry Common Stock that may be the
subject  of  Incentive  Awards  under  the 1997 Plan may not  exceed  2,250,000;
provided,  that rights that are  exercisable  as an alternative to an option (as
described below) will not be subject to the foregoing  limitation.  In addition,
up to 564,548 shares of Sentry Class A Preferred Stock may be subject to options
granted under the 1997 Plan in  substitution  for Knogo Stock Options.  See "The
Merger -- Conversion of Knogo Common Stock -- Knogo Stock Options."
    

         The exercise price under an incentive  stock option or a  non-qualified
stock  option is fixed by the Sentry  Board on the date of grant;  however,  the
exercise  price under an  incentive  stock  option must be at least equal to the
fair market value of Sentry Common Stock on the date of grant of the option.

         Stock  options  and stock  appreciation  rights are  exercisable  for a
duration  of ten years from the date of grant.  Options  and stock  appreciation
rights  are  exercisable  at such rate and  times as may be fixed by the  Sentry
Board on the date of grant.  The holder of a stock option  granted in connection
with an  alternative  stock  appreciation  right (which is  described  below) is
entitled to exercise  such option only by  surrendering  the  alternative  stock
appreciation  right with  respect to the same  number of shares as to which such
option is exercised,  and to receive payment thereof.  The aggregate fair market
value (determined at the time the option is granted) of Sentry Common Stock with
respect to which incentive stock options are exercisable for the first time by a
participant during any calendar year (under all stock option plans of Sentry and
its subsidiaries) cannot exceed $100,000;  to the extent that this limitation is
exceeded,  such excess  options are treated as  non-qualified  stock options for
purposes of the 1996 Plan and the Code. Non-qualified options are not subject to
the $100,000 limitation and are not included in determining whether the $100,000
limitation has been exceeded.

         At the time a stock  option is  granted,  the Sentry  Board may, in its
sole  discretion,  designate  whether the stock  option is to be  considered  an
incentive  stock option or a non-qualified  stock option.  Stock options with no
such designation  shall be deemed incentive stock options to the extent that the
$100,000  limit  described  above is met and such  options  satisfy the relevant
conditions under the Code.

         Payment of the purchase price for shares  acquired upon the exercise of
options may be made by any one or more of the  following  methods:  in cash,  by
check,  by delivery to Sentry of shares of Sentry  Common Stock already owned by
the option holder, by a "cashless"  exercise method with a designated broker, or
by such other method as the Sentry Board may permit from time to time.

         A stock appreciation right may be granted either  independently,  or in
connection with, a stock option at the time of grant. A stock appreciation right
granted in connection with a stock option is exercisable  (a) only to the extent
that the related stock option is exercisable and (b) either in conjunction with,
or  as  an  alternative  to,  the  exercise  of  the  related  option.  A  stock
appreciation  right is the right to receive an amount  equal to the excess (or a
portion of the excess,  as determined by the Sentry Board at the time of grant),
of the  fair  market  value  of a share of  Sentry  Common  Stock on the date of
exercise over (i) the fair market value of a share of Sentry Common Stock on the
date of grant, in the case of a stock appreciation  right granted  independently
of any stock option,  or (ii) the exercise price of the related stock option, in
the case of a stock appreciation right granted in connection with a stock option
(which excess is referred to as the "Spread"). The holder of a conjunctive stock
appreciation  right granted in connection  with a stock option is deemed to have
exercised the right at the same time,  and to the same extent that,  the related
stock option is exercised. The holder of an alternative stock appreciation right
granted in  connection  with a stock  option is entitled to exercise  such right
only by surrendering the related stock option with respect to the same number of
shares as to which such stock  appreciation  right is exercised,  and to receive
payment  therefor.  The number of shares  with  respect to which an  alternative
stock option is surrendered are not available for future grants


                                       90
<PAGE>

of  Incentive  Awards.  The Sentry  Board may limit the amount  payable upon the
exercise of any stock appreciation right.

         At the  election of the  holder,  but  subject to  disapproval  of such
election  by the  Sentry  Board,  distribution  of the amount  payable  upon the
exercise of a stock  appreciation  right may be made in shares of Sentry  Common
Stock,  valued at their fair  market  value on the date of exercise of the stock
appreciation right, or in cash, or in a combination of cash and shares.

         Stock  options  and  stock   appreciation   rights  become  immediately
exercisable  in full upon the retirement of the holder after reaching the age of
65, upon the disability or death of the holder while in the employ or service of
Sentry or a subsidiary,  upon a Change of Control (for purposes of this section,
used as defined in the 1997 Plan) while the holder is employed by, or serving as
a director of,  Sentry or a subsidiary  or upon the  occurrence  of such special
circumstances as in the opinion of the Sentry Board merit special consideration.
However, no options or rights may be exercised earlier than six months following
the date of grant.

         Stock options and stock appreciation rights terminate at the end of the
third business day following the holder's  termination of employment or service.
This period is extended to three months in the case of the  holder's  retirement
or disability,  and six months in the case of the holders  death,  in which case
the stock option and/or stock  appreciation right is exercisable by the holder's
estate.

         The  Sentry  Board  may  grant  restricted  stock  awards  to  eligible
individuals. A restricted stock award is the issuance of shares of Sentry Common
Stock or the  grant of the  right to  purchase  Sentry  Common  Stock at a price
determined by the Sentry Board.  Such shares of Sentry Common Stock, when and if
issued, are subject to transfer  restrictions  determined by the Sentry Board in
its sole discretion,  and subject to substantial  risk of forfeiture  unless and
until specific  conditions  established by the Sentry Board at the time of grant
are met. Such  conditions  may be based on  continuing  employment or service or
achievement of pre-established performance objectives, or both, as determined by
the Sentry Board.  Unless the holder of a restricted stock award ceases to be an
employee or director of Sentry or a  subsidiary  (for  reasons  other than those
described below), the transfer restrictions imposed upon restricted stock awards
will lapse in accordance  with a schedule or other  conditions as are determined
by the  Sentry  Board.  All  restrictions  immediately  cease  upon the death or
disability of the holder,  upon a Change of Control while the holder is employed
by, or serving as a director of, Sentry or a subsidiary  or upon the  occurrence
of such  special  circumstances  as in the  opinion  of the Sentry  Board  merit
special consideration.

         Payment of the purchase price for restricted shares is made in cash, by
check, or by such other methods as the Sentry Board may permit.

         Certificates for the shares of Sentry Common Stock granted or purchased
pursuant  to a  restricted  stock  award are  issued  in the name of the  holder
thereof,  but the  certificates  are retained by Sentry for the holder's account
and are not delivered to the holder until such time as the restrictions  imposed
on the  transfer of such shares have lapsed.  The holder of a  restricted  stock
award has the right to vote the shares of Sentry Common Stock  registered in his
or  her  name.  Dividends  and  distributions  (including  stock  dividends  and
distributions in the event of a split-up, conversion, exchange, reclassification
or  substitution)  with respect to such shares may be retained by Sentry for the
holder's account, to be distributed to the holder at the time, and to the extent
that, the restrictions imposed on the transfer of such shares shall have lapsed.

         The  Sentry   Board  may  grant   phantom   stock  awards  to  eligible
individuals.  A phantom stock award entitles the holder to receive  payment from
Sentry,  upon the expiration of a vesting period,  in an amount equal to (i) the
fair  market  value of one  share  of  Sentry  Common  stock on the date of such
expiration,  multiplied by (ii) the number of units of phantom stock credited to
the  holder  pursuant  to such  award and as to which  the  vesting  period  has
expired.  Payment of such  amount may be made in the form of cash,  or shares of
Sentry Common Stock, or a combination of cash or shares,  pursuant to such terms
and  conditions  as are  determined  by the Sentry  Board.  The  vesting  period
generally  expires in  accordance  with a schedule  or other  conditions  as are
determined by the Sentry Board;  however, the vesting period completely expires,
and all amounts become payable  immediately  upon the death or disability of the
holder,  upon a Change of Control while the holder is employed by, or serving as
a director of,  Sentry or a subsidiary  or upon the  occurrence  of such special
circumstances as in the opinion of the Sentry Board merit special consideration.



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<PAGE>

         The holder of a phantom  stock award is credited  with amounts equal to
the dividends payable with respect to the same number of shares of Sentry Common
Stock as the number of phantom stock units  credited  under the award;  however,
such  dividend-equivalent  amounts may be  retained  by Sentry for the  holder's
account,  to be  distributed  to the holder at the time, and to the extent that,
the vesting period with respect to such number of units shall have expired.

         Each Incentive  Award (other than grants of restricted  stock) contains
anti-dilution  provisions which will  automatically  adjust the number of shares
subject  to  Incentive  Awards  in the  event  of a  stock  dividend,  split-up,
conversion,  exchange,  reclassification  or  substitution.  In the event of any
other change in the corporate  structure or outstanding  shares of Sentry Common
Stock,  the Sentry Board may make such  equitable  adjustments  to the number of
shares  and  the  class  of  shares  available  under  the  1997  Plan or to any
outstanding Incentive Awards as it shall deem appropriate to prevent dilution or
enlargement  of  rights.  Notwithstanding  the  preceding,  in  the  event  of a
termination  of employment or service in connection  with a Change of Control if
such Change of Control is not approved by a majority of the  Existing  Directors
(as defined in Sentry's  Certificate  of  Incorporation),  such holder  shall be
entitled to receive an amount of cash in lieu of shares of Sentry  Common  Stock
upon the exercise of such options.

         Sentry shall obtain such  consideration  for granting  Incentive Awards
under the 1997 Plan as the Sentry Board in its discretion may request.

         Each  Incentive  Award may be subject to  provisions to assure that any
exercise or  disposition  of Sentry Common Stock will not violate the securities
laws.

         No Incentive Award may be granted under the 1997 Plan after January 14,
2007.

         The Sentry  Board may at any time  withdraw  or amend the 1997 Plan and
may, with the consent of the affected holder of an outstanding  Incentive Award,
at any time withdraw or amend the terms and conditions of outstanding  Incentive
Awards.  Any  amendment  which  would  increase  the  number of shares  issuable
pursuant  to  Incentive  Awards  or  change  the  class of  individuals  to whom
Incentive  Awards  may be  granted  shall  be  subject  to the  approval  of the
stockholders of Sentry within one year of such amendment.

         The 1997 Plan and all awards  thereunder (other than options granted in
substitution  for Knogo and Video options) are conditioned  upon approval of the
1997  Plan by the  stockholders  of  Sentry  within  one year  after its date of
adoption by the Sentry Board.

Federal Income Tax Consequences of the 1997 Plan

         The Federal  income tax  consequences  to an  individual  who  receives
incentive stock options generally will, under current law, be as follows:

         An individual will not realize any income upon the grant or exercise of
an incentive  stock option.  If the individual  disposes of the shares of Sentry
Common Stock  acquired upon the exercise of an incentive  stock option more than
two years  after the date the  option is  granted  and more than one year  after
Sentry Common Stock is transferred  to him or her, the  individual  will realize
long-term  capital gain in an amount equal to the excess,  if any, of his or her
selling  price for the shares  over the  option  exercise  price.  In such case,
Sentry will not be entitled to any tax deduction  resulting from the issuance or
sale of the shares.  If the  individual  disposes of the shares of Sentry Common
Stock  acquired  upon the  exercise of an  incentive  stock  option prior to the
expiration  of two years from the date the option is  granted,  or one year from
the date Sentry  Common Stock is  transferred  to him or her, any gain  realized
will be taxable at such time as follows: (a) as ordinary income to the extent of
the  difference  between  the option  exercise  price and the lesser of the fair
market  value of the shares on the date the option was  exercised  or the amount
realized  from such  disposition,  and (b) as  capital gain to the extent of any
excess over the amount described in clause (a), which excess shall be treated as
short-term or long-term capital gain depending upon the holding period of Sentry
Common  Stock.  In such  case,  Sentry  may claim an income  tax  deduction  (as
compensation) for the amount taxable to the individual as ordinary income.

         In general,  the  difference  between  the fair market  value of Sentry
Common Stock at the time the incentive  stock option is exercised and the option
exercise price will constitute an item of adjustment, for purposes of


                                       92
<PAGE>

determining  alternative minimum taxable income, and under certain circumstances
may be subject, in the year in which the option is exercised, to the alternative
minimum tax.

         If an  individual  uses shares of Sentry  Common  Stock which he or she
owns to pay,  in  whole or in part,  the  exercise  price  for  shares  acquired
pursuant to an incentive  stock  option,  (a) the  holding  period for the newly
issued shares of Sentry Common Stock equal in value to the old shares which were
surrendered  upon the  exercise  shall  include the period  during which the old
shares were held, (b) the individual's basis in such newly issued shares will be
the same as his or her basis in the old shares  surrendered  and (c) no  gain or
loss  will  be  recognized  by the  individual  on the old  shares  surrendered.
However,  if any  individual  uses shares  previously  acquired  pursuant to the
exercise of an incentive  stock option to pay all or part of the exercise  price
under an incentive  stock option,  such tender will  constitute a disposition of
such  previously  acquired  shares for purposes of the  one-year  (or  two-year)
holding period  requirement  applicable to such incentive  stock option and such
tender may be treated as a taxable exchange.

         The Federal  income tax  consequences  to an  individual  who  receives
non-qualified stock options generally will, under current law, be as follows:

         An  individual  will not  realize  any income at the time the option is
granted.  Generally, an individual will realize ordinary income, at the time the
option  is  exercised  in a total  amount  equal to the  excess of the then fair
market value of Sentry Common Stock acquired over the exercise  price.  However,
Section 83 of the Code  provides  that,  if a  director,  officer  or  principal
stockholder (i.e., an owner of more than 10% of the outstanding shares of Sentry
Common Stock) receives shares pursuant to the exercise of a non-qualified  stock
option,  he or she is not  required to  recognize  any income  until the date on
which such shares can be sold at a profit without  liability under Section 16(b)
of  the  Exchange  Act.  At  such  time,  the  director,  officer  or  principal
stockholder  will  realize  income  equal to the  amount  by which the then fair
market  value of the shares  acquired  pursuant  to the  exercise of such option
exceeds the price paid for such shares.  Alternatively,  a director,  officer or
principal  stockholder  who would not  otherwise be taxed at the time the shares
are  transferred  may file a written  election  within 30 days with the Internal
Revenue  Service,  to be  taxed as of the date of  transfer,  on the  difference
between  the then fair  market  value of the  shares and the price paid for such
shares.

         All income realized upon the exercise of a  non-qualified  stock option
will be taxed as ordinary  income.  Sentry  generally  will be entitled to a tax
deduction  (as  compensation  expense) for the amount  taxable to an  individual
(including a director, officer and principal stockholder) upon the exercise of a
non-qualified  stock  option,  as  described  above,  in the same  year as those
amounts are taxable to the individual.

         Shares of Sentry  Common  Stock  issued  pursuant to the  exercise of a
non-qualified  stock option  generally  will  constitute a capital  asset in the
hands of an individual  and will be eligible for capital gain or loss  treatment
upon any  subsequent  disposition.  The  holding  period of an  individual  will
commence upon the date he or she recognizes  income with respect to the issuance
of such shares, as described above. The individual's basis in the shares will be
equal to the  greater of their fair  market  value as of that date or the amount
paid for such shares. If, however,  he or she uses shares of Sentry Common Stock
which he or she owns to pay, in whole or in part,  the exercise price for shares
acquired  pursuant to the  exercise of a  non-qualified  stock  option,  (a) the
holding period for the newly issued shares of Sentry Common Stock equal in value
to the old shares which were  surrendered  upon the exercise  shall  include the
period during which the old shares were held, (b) the basis in such newly issued
shares will be the same as his or her basis in the  surrendered  shares,  (c) no
gain or loss will be realized by the  individual on the old shares  surrendered,
and (d) the individual  will realize  ordinary  income in an amount equal to the
fair market value of the additional number of shares received over and above the
number of old shares surrendered.

         The Federal  income tax  consequences  to an  individual  who  receives
restricted stock awards generally will, under current law, be as follows:

         An  individual  will not  realize  any income when the right to acquire
shares subject to restricted stock awards  ("Restricted  Shares") is granted, or
when the certificates for the Restricted Shares themselves are registered in his
or her  name.  The  individual  will  realize  ordinary  income  as and when the
Restricted  Shares are no longer  subject to a  substantial  risk of  forfeiture
(which risk of forfeiture includes the restrictions  imposed by Section 16(b) of
the Exchange Act), in an amount equal to the difference  between the fair market
value of the Restricted  Shares as of such date and the price he or she paid for
such shares. Alternatively, the individual can file a written election with


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<PAGE>

the Internal  Revenue  Service,  no more than 30 days after the certificates for
the Restricted  Shares are issued, to be taxed as of the date of issuance on the
difference  between the then fair market value of the Restricted  Shares and the
price he or she paid for such shares.  Once the individual has realized ordinary
income with respect to the Restricted  Shares,  any  subsequent  increase in the
value of the Restricted  Shares generally will be taxed when the shares are sold
as long-term or  short-term  capital gain  depending on how long the  Restricted
Shares are held. The individual's  holding period with respect to the Restricted
Shares will begin on the date he or she realizes ordinary income with respect to
the  Restricted  Shares and the basis in the shares  will be equal to their then
fair market value.  Sentry  generally will be entitled to a tax deduction  when,
and to the extent, ordinary income is realized by the individual with respect to
such shares. Any dividends or other  distributions paid on the Restricted Shares
generally will be taxable when distributed to the individual.

         An individual  will be subject to tax, at ordinary income rates, on the
amount  of cash and the fair  market  value of any  property  received  upon the
exercise of any stock appreciation  rights or upon the expiration of the vesting
period under a phantom stock award.  Sentry  generally will be entitled to a tax
deduction equal to the amount includible in the individual's income.

         In addition to the Federal  income tax  consequences  discussed  above,
Section  280G of the Code  provides  that if an officer,  stockholder  or highly
compensated individual receives a payment which is in the nature of compensation
and which is  contingent  upon a change of  control  of the  employer,  and such
payment  equals or exceeds three times his or her "base salary" (as  hereinafter
defined),  then any  amount  received  in  excess  of the base  salary  shall be
considered an "excess parachute payment." An individual's "base salary" is equal
to his or her average annual  compensation  over the five-year period (or period
of employment,  if shorter)  ending with the close of the  individual's  taxable
year  immediately  preceding  the  taxable  year in which the  change of control
occurs. If the taxpayer establishes,  by clear and convincing evidence,  that an
amount received is reasonable compensation for past or future services, all or a
portion of such amount may be deemed not to be an excess parachute  payment.  If
any payments made under the 1997 Plan in connection  with a change of control of
Sentry constitute excess parachute payments with respect to any individual, then
in addition to any income tax which would otherwise be owed on such payment, the
individual  will be  subject  to an  excise  tax  equal  to 20% of  such  excess
parachute  payment and Sentry will not be entitled to any tax deduction to which
it otherwise  would have been  entitled  with  respect to such excess  parachute
payment.

         Section 280G provides that payments made pursuant to a contract entered
into  within one year of the  change of control  are  presumed  to be  parachute
payments unless the individual  establishes,  by clear and convincing  evidence,
that such contract was not entered into in contemplation of a change in control.
In addition,  the General  Explanation of the Tax Reform Act of 1984 prepared by
the Staff of the Joint  Committee  on  Taxation  indicates  that the grant of an
Incentive Award within one year of the change of control or the  acceleration of
an Incentive  Award because of a change of control may be considered a parachute
payment, in an amount equal to the value of the Incentive Award, as the case may
be. Pursuant to proposed  regulations  issued by the Treasury  Department  under
Section 280G, the acceleration of non-qualified stock option, stock appreciation
rights,  a restricted  stock award or phantom stock award because of a change of
control is considered a parachute payment in an amount equal to the value of the
accelerated  portion  of the  option,  rights or award.  Even if the grant of an
Incentive Award within one year of the change of control or the  acceleration of
an Incentive Award is not a parachute  payment for purposes of Section 280C, the
exercise of a stock option or stock  appreciation  right granted within one year
of the change of control or the exercise of the  accelerated  portion of a stock
option or stock  appreciation  right may result in a  parachute  payment,  in an
amount equal to the excess of the fair market value of the shares  received upon
exercise of the option over the exercise price (or the cash or fair market value
of shares  received upon the exercise of stock  appreciation  rights).  Payments
received  for the  cancellation  of an  Incentive  Award  because of a change of
control may also result in parachute payments.

         Under  Section  162(m) of the Code,  publicly  held  companies  may not
deduct compensation for certain individuals to the extent that such compensation
exceeds  for an  individual  for the  taxable  year.  The $1 million  limitation
applies to Sentry's  Chief  Executive  Officer and Sentry's two other  executive
officers.  Compensation  which is performance  based (as defined in the Code and
rules and  regulations  thereunder)  however,  is not  counted as subject to the
deductibility limitation of Section 162(m) of the Code. Income pursuant to stock
options, rights, restricted stock awards and phantom stock awards under the 1997
Plan would be subject to the deductibility  limitations of Section 162(m) of the
Code.



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<PAGE>

         The foregoing  summary with respect to federal income taxation does not
purport to be complete and reference is made to the applicable provisions of the
Code.


Sentry Retirement Savings 401(k) Plan

         As of the  Effective  Time  Sentry  will have  adopted  and  become the
sponsor of the Sentry Technology Corporation Retirement Savings 401(k) Plan (the
"Sentry Savings Plan"), formerly the Knogo North America Inc. Retirement Savings
401(k) Plan (the "Knogo Savings Plan"), which is intended to be a qualified plan
under  Sections  401(a)  and  401(k) of the Code.  All  employees  of Sentry are
eligible to  participate  in the Sentry Savings Plan following the date any such
employee  attains the age of  twenty-one  and completes one year of service with
Sentry.  Prior  service  with Knogo and Video will be credited  for all purposes
under the Sentry Savings Plan.  Each  participant may elect to defer the receipt
of between 1% and 10% of such participant's compensation (a "Deferral Election")
and have Sentry contribute such compensation to the Sentry Savings Plan, on such
participant's  behalf,  up  to an  annual  statutory  limitation.  For  1996,  a
participant  cannot elect to defer more than $9,500.  This amount is adjusted by
the Secretary of the Treasury to reflect increases in the cost of living.

         An eligible  employee  may also elect to defer from 1% to 10% of his or
her  compensation on an after-tax basis (an "After-Tax  Contribution")  and have
Sentry  contribute  such  compensation  to the  Sentry  Savings  Plan,  on  such
participant's  behalf. An eligible employee may not elect to defer more than 15%
of  such  participant's  compensation  as to  both  the  participant's  Deferral
Election and After-Tax Contributions.

         In addition to the  contribution  made  pursuant to each  participant's
Deferral Election and any After-Tax  Contributions,  Sentry will make a matching
contribution (a "Matching  Contribution")  in an amount equal to a percentage of
the participant's  Deferral Election designated by the Compensation Committee of
the  Sentry  Board.   Sentry  may  also  contribute  a  discretionary   matching
contribution  (a  "Discretionary   Matching   Contribution")  and  discretionary
non-matching contribution (a "Discretionary  Non-Matching-Contribution") for any
plan  year  which  will be  conditioned  upon the  participant  being an  active
employee as of December 31 of the year,  except in cases of an approved leave of
absence, death or normal, early or disability retirement.

         Sentry's Matching Contributions,  Discretionary Matching Contributions,
Discretionary  Non-Matching  Contributions  and  earnings  thereon  will  become
nonforfeitable  at a 20%  rate  for  each  year  of  service  completed  by  the
participant,  so that the participant  will be fully vested upon completing five
years  of  service.   However,  such  contributions  will  become  fully  vested
regardless  of years of service if the  participant's  employment  terminates by
reason of  retirement,  disability or death. A participant is always 100% vested
in such participant's other benefits under the Sentry Savings Plan.

         All of the contributions  under the Sentry Savings Plan will be held in
trust (the "Trust") and  allocated to one or more accounts  maintained on behalf
of each  participant  (the  "Accounts").  The Trust  will be  divided  into four
investment  vehicles,  including the Sentry Common Stock Fund.  When an eligible
employee  becomes a participant,  the employee can elect (in multiples of 5%) to
have  all  or  part  of  the  Participant's  Elective  Deferrals  and  After-Tax
Contributions  invested in one or more of the funds. The Matching  Contribution,
Discretionary    Matching    Contributions   and   Discretionary    Non-Matching
Contributions  will  automatically  be invested in the Sentry Common Stock Fund.
Any  dividends  paid on  shares  of  Sentry  Common  Stock in said  Fund will be
reinvested in additional shares of Sentry Common Stock.

         When a  participant  stops  working  for  Sentry  for any  reason,  the
participant  will be entitled to receive an amount  equal to the vested value of
such  participant's  accounts.  A  participant's  benefit  will  be paid to such
participant,  or,  in  the  case  of his or her  death,  to  such  participant's
beneficiary, in a lump sum payable in either cash or Sentry Common Stock, to the
extent that any funds have been invested in Sentry's Common Stock Fund under the
Sentry Savings Plan.  Also, all or a part of certain amounts  contributed to the
Sentry  Savings  Plan  may be  withdrawn,  in the  case of  financial  hardship.
Finally,  a  participant  may  borrow the  invested  amounts  allocated  to such
participant's account, up to certain specified limits.  Interest will be payable
to the Sentry Savings Plan on any amounts borrowed.

         The Sentry  Savings Plan will be  administered  by the  Committee.  The
expenses of  administering  the Sentry  Savings  Plan will be paid by the Sentry
Savings Plan, unless Sentry elects to pay such expenses directly.



                                       95
<PAGE>

                 SENTRY SECURITY OWNERSHIP OF CERTAIN BENEFICIAL
                              OWNERS AND MANAGEMENT

         The following table sets forth the anticipated  beneficial ownership of
Sentry  Common  Stock,  after  giving  effect to the  Merger,  as to each person
expected to be (i) the beneficial owner of five percent or more of the shares of
Sentry  Common  Stock,  (ii) a Sentry  director,  (iii) an executive  officer of
Sentry  and (iv) all  persons  expected  to be Sentry  directors  and  executive
officers,  as a group.  This table includes shares subject to options which will
vest as a result of the Merger.

       Name                              Number of Shares    Percent of Class(1)
       ----                              ----------------    -------------------
   
Thomas A. Nicolette                           336,242(2)           3.4%

Peter J. Mundy                                 91,241(3)              *

Andrew L. Benson                              194,278              2.0%

Peter Y. Zhou                                  84,372(4)              *

William A. Perlmuth                           902,368(5)           9.3%

Robert D. Furst, Jr.                          976,672(6)          10.0%

Walter & Edwin Schloss Associates L.P.        533,605(7)           5.5%

All Sentry directors and executive 
     officers as a group                    2,585,173(8)          25.4%
    
- ---------------------------

*        Less than one percent
(1)      Based on  9,643,685  shares  outstanding  as of the  completion  of the
         Merger.  Each  figure  showing the  percentage  of  outstanding  shares
         beneficially  owned has been  calculated by treating as outstanding and
         owned the shares  which  could be  purchased  by the  indicated  person
         within 60 days upon exercise of stock options.
(2)      Excludes  41,590  shares  held  by a  trust  for  the  benefit  of  Mr.
         Nicolette's wife, as to which shares Mr. Nicolette disclaims beneficial
         ownership.  Includes 74,862 shares held by Mr.  Nicolette as co-trustee
         under  trusts  for the  benefit of his minor  children  and as to which
         shares Mr.  Nicolette  disclaims  beneficial  ownership.  Also includes
         197,138 shares issuable upon the exercise of stock options  exercisable
         within  60 days  from the date  hereof.  Also  includes  25,001  shares
         resulting  from the conversion of shares of Video Common Stock owned by
         Mr. Nicolette prior to the Merger.
(3)      Includes  73,615  shares  issuable  upon the exercise of stock  options
         exercisable within 60 days from the date hereof.
(4)      Includes  70,703  shares  issuable  upon the exercise of stock  options
         exercisable within 60 days from the date hereof.
(5)      Consists of (a) 750,729 shares held by Mr.  Perlmuth as Executor of the
         Estate of Arthur J. Minasy,  (b) 130,011 shares held by Mr. Perlmuth as
         trustee under trusts for the benefit of Mr.  Minasy's  adult  children,
         and (c) 3,327 shares beneficially owned by Mr. Perlmuth.  Also includes
         18,299 shares  issuable upon the exercise of stock options  exercisable
         within 60 days from the date hereof. Under the policies of the law firm
         of which he is a member,  Mr. Perlmuth will share any economic benefits
         of the options with the other members of such firm.
(6)      Includes  175,182  shares which could be purchased upon the exercise of
         existing options and warrants which are currently  exercisable or which
         will become exercisable within 60 days from the date hereof.
(7)      Includes  7,070  shares  beneficially  owned  solely  by Mr.  Walter J.
         Schloss and 5,822  shares  beneficially  owned  solely by Mr.  Edwin W.
         Schloss.
(8)      Includes  534,937  shares which could be purchased upon the exercise of
         existing options and warrants which are currently  exercisable or which
         will become exercisable within 60 days from the date hereof.


                                       96
<PAGE>

           COMPARATIVE PER SHARE MARKET PRICE AND DIVIDEND INFORMATION

         The  Video  Common  Stock is listed on the  NASDAQ  SmallCap  under the
symbol VSEN. The Knogo Common Stock is listed on the AMEX under the symbol KNA.

         The table below sets forth, for the calendar  quarters  indicated,  the
reported  high and low sales prices of Video Common Stock and Knogo Common Stock
as reported on the NASDAQ SmallCap and AMEX, respectively, in each case based on
published financial sources, and the dividends declared on such stock.

   
<TABLE>
         The Video Common Stock began trading on the NASDAQ  SmallCap on October
21, 1994.  Prior to such date,  there was no public  market for the Video Common
Stock.  The Knogo  Common  Stock  began  trading on the AMEX on January 3, 1995.
Prior to such date, there was no public market for the Knogo Common Stock.

<CAPTION>
                                                       Video Common Stock                 Knogo Common Stock        
                                                  -----------------------------------    ------------------------------
                                                   High         Low         Dividends     High        Low      Dividends
                                                   ----         ---         ---------     ----        ---      ---------
<S>                                                 <C>          <C>          <C>       <C>         <C>          <C>
1994
         Fourth Quarter (beginning                                                                                   
         October 21, 1994)..................        $ 6          $ 4-1/4      --           --           --       --
1995                                                                                   
         First Quarter (beginning                                                                            
         January 3, 1995, with                                                                               
         respect to Knogo)..................          7-3/4        5          --        $ 3-3/8     $  2-1/2     --
         Second Quarter ....................         12-7/8        6-3/8      --          4-3/8        2-3/8     --
         Third Quarter .....................         14-1/8       11-1/8      --          8-1/16       3-11/16   --
         Fourth Quarter ....................         13-1/4        7-1/4      --          7-7/16       5-9/16    --
1996                                                                                  
         First Quarter  ....................          9-1/2        5-1/8      --          7-7/8        5-7/8     --
         Second Quarter ....................          9-3/8        5-7/8      --         14-1/2        9-1/2     --
         Third Quarter .....................          7-1/8        2-1/8      --          8-5/8        7         --
         Fourth Quarter.....................          5            1-3/4      --          9-3/8        4-3/8     --

<FN>
- ---------------------------


         On October  10,  1996,  the last full  trading  day prior to the public
announcement  of the proposed  Merger,  the closing price on the NASDAQ SmallCap
was  $4-3/8 per share of Video  Common  Stock and on the AMEX  was  $8-5/16  per
share of Knogo Common Stock.  On January 17, 1997,  the most recent  practicable
date prior to the printing of this Joint Proxy Statement/Prospectus, the closing
price on the NASDAQ  SmallCap  was $2-7/8 per share of Video Common Stock and on
the AMEX was $5-1/2 per share of Knogo  Common  Stock.  Holders of Video  Common
Stock and Knogo Common Stock are urged to obtain current market quotations prior
to making any decision with respect to the Merger.

</FN>
</TABLE>
    
         The  payment  of future  dividends  on Sentry  Common  Stock  will be a
business  decision  to be  made  by  the  Board  of  Directors  of  Sentry  from
time-to-time  based upon the results of operations  and  financial  condition of
Sentry  and such  other  factors  as the  Sentry  Board of  Directors  considers
relevant.  Sentry has not paid, and does not presently intend to pay or consider
the payment of, any cash  dividends on the Sentry Common Stock.  Pursuant to the
terms of the Merger  Agreement,  Sentry is  required  to pay  certain  annual or
semiannual  dividends  on the  Sentry  Class A  Preferred  Stock  as more  fully
described under "Description Of Sentry Capital Stock -- Preferred Stock -- Class
A Preferred Stock."



                                       97
<PAGE>

<TABLE>
               SELECTED HISTORICAL FINANCIAL INFORMATION OF VIDEO

         The  following   table  sets  forth   selected   historical   financial
information of Video and has been derived from and should be read in conjunction
with Video's  audited  financial  statements  and  unaudited  interim  financial
statements,  including the notes thereto,  which are contained elsewhere in this
Joint  Proxy  Statement/Prospectus.  Unaudited  interim  data  reflects,  in the
opinion  of  Video's  management,  all  adjustments  (consisting  only of normal
recurring  adjustments)  considered necessary for a fair presentation of results
for such interim  periods.  Results of operations for unaudited  interim periods
are not  necessarily  indicative  of results which may be expected for any other
interim or annual period.

<CAPTION>
                                                 (In thousands, except per share data)

                                                                                                             Nine Months Ended
                                                        Year Ended December 31,                                September 30, 
                               --------------------------------------------------------------------------      --------------
                                    1991          1992          1993      1994         1995         1995           1996  
                                    ----          ----          ----      ----         ----         ----           ----
                                                                                                                     
<S>                               <C>          <C>          <C>          <C>          <C>          <C>           <C>    
Statement of Operations
Data:

Sales                             $  --        $   257      $   744      $ 4,241      $ 8,610      $ 7,768       $ 2,000
                                                                                                               
Cost of sales                        --            188          564        3,440        7,343        5,899         3,085
                                                                                                               
Gross margin                         --             69          180          801        1,267        1,869        (1,085)
                                                                                                               
Operating expenses                    231          663        1,048        1,549        3,046        1,951         1,867
                                                                                                               
Net income (loss)                    (231)        (599)        (916)        (847)      (1,681)          12        (3,035)
                                                                                                               
Net income (loss) per               (0.16)       (0.30)       (0.38)       (0.31)       (0.36)        0.00         (0.63)
share(1)                                                                                                       
                                                                                                               
Weighted average number                                                                                        
of shares outstanding(1)            1,400        2,012        2,388        2,748        4,674        5,208         4,809
                                                                                                               
                                                                                                               
                                                                                                               
Balance Sheet Data:                                                                                            
  (at end of period)                                                                                           
                                                                                                               
Working capital (deficit)         $  (142)     $  (195)     $(1,047)     $ 5,163      $ 2,760      $ 4,531       $    41
Total assets                           45          294          491        6,342        6,615        7,562         5,251
Total shareholders' equity                                                                                     
(deficit)                            (120)        (123)        (959)       5,349        3,876        5,570         1,128
                                                                                                               
<FN>                                                                                                         
- -----------------
See the notes to the Financial Statements included elsewhere herein.

(1)      Computed  on the  basis  described  in  Note 1 of  Notes  to  Financial
         Statements of Video.
</FN>
</TABLE>


                                       98
<PAGE>

<TABLE>
               SELECTED HISTORICAL FINANCIAL INFORMATION OF KNOGO


         Knogo  was  incorporated  in August  1994.  However,  information  with
respect to the historical  results of operations of Knogo is presented as if the
Spinoff and Merger with Sensormatic  Electronics Corporation were consummated as
of March 1, 1991.  The table below sets forth selected  historical  consolidated
financial  information  of Knogo for each of the three years in the period ended
February 28, 1994,  the ten month period ended December 31, 1994, the year ended
December 31, 1995 and the nine months period ended  September 30, 1995 and 1996.
This selected historical  consolidated  financial  information  includes certain
assets and  liabilities  of Knogo,  on a historical  basis,  relating to Knogo's
operations in the United States, Canada and Puerto Rico. The selected historical
consolidated  financial information for the year ended February 28, 1994, the 10
month period ended  December 31, 1994 and the year ended  December 31, 1995 have
been derived from the audited financial  statements of Knogo contained elsewhere
in this Joint Proxy  Statement/Prospectus.  The selected historical consolidated
information for the year ended February 29, 1992 and February 28, 1993 and as of
February  28, 1994 has been  derived from the audited  financial  statements  of
Knogo not  included  in this  Joint  Proxy  Statement/Prospectus.  The  selected
historical  consolidated  financial information as of February 28, 1992 has been
derived from the  unaudited  financial  statements of Knogo not included in this
Joint Proxy Statement/Prospectus. The selected historical consolidated financial
information  for the nine month periods  ended  September 30, 1995 and 1996 have
been derived from the unaudited financial statements of Knogo included elsewhere
in this Joint  Proxy  Statement/Prospectus.  In the opinion of  management,  the
unaudited consolidated financial statements have been prepared on the same basis
as the audited  consolidated  financial  statements and include all adjustments,
consisting  only  of  normal  recurring   adjustments,   necessary  for  a  fair
presentation  of the  financial  position  and  results of  operations  for such
periods.  The results for the interim periods are not necessarily  indicative of
the  results  for  the  related  full  fiscal  year.  The  selected   historical
consolidated information should be read in conjunction with, and is qualified in
its entirety by, the  Consolidated  Financial  Statements of Knogo and the notes
thereto and the other  financial  information  included  elsewhere in this Joint
Proxy Statement/Prospectus.

<CAPTION>
                                                         (Amounts in thousands except for per share data)
                                 
                                              Year ended the last    Ten Months Ended  Year Ended     Nine Months Ended
                                                day of February         December 31,   December 31,      September 30,    
                                        ----------------------------    ------------   ------------   ----------------
                                        1992         1993       1994        1994          1995        1995        1996   
                                        ----         ----       ----        ----          ----        ----        ----
<S>                                  <C>          <C>         <C>         <C>          <C>         <C>         <C>     
Summary of Operations Data:
Sales of security devices and
 related interest income, service
 rentals and other ..................$ 24,242     $ 22,592    $ 18,243    $ 13,724     $ 17,361    $ 13,327    $ 14,190
Sales to affiliates/Sensormatic .....   9,734       10,072      11,375       6,957       12,043       9,062       3,990
Total revenues ......................  33,976       32,664      29,618      20,681       29,404      22,389      18,180
Cost of sales .......................  16,832       16,697      14,631      10,041       14,425      11,168       9,398
Customer service expenses ...........   4,046        3,969       3,984       3,353        3,235       2,621       2,197
Selling, general and
 administrative expenses ............  11,926        9,819       9,227       9,548        8,235       6,143       5,387
Income (loss) before income
  taxes .............................    (738)       1,148         762      (2,858)       1,941       1,265       2,655**
Net income (loss) ...................  (1,057)         624         123      (2,833)       1,731       1,075       1,991
Net income per share ................       *            *           *           *         0.29        0.18        0.33
Selected Balance Sheet Data:
(at end of period)
Total assets ........................$ 36,193     $ 33,546    $ 34,583    $ 26,522     $ 29,338    $ 28,257    $ 30,485
Property, plant and equipment,
  net ...............................  13,753       13,092      12,830       9,842        9,081       9,222       8,950
Long term bank debt .................    --           --          --          --           --          --          --
Obligations under capital leases ....    --            797         688         945          748         763         587
Total stockholders' equity ..........  32,056       28,308      27,055      20,888       22,669      21,953      24,858

<FN>
See the  notes  to the  Consolidated  Financial  Statements  of  Knogo  included
elsewhere herein.

*        Historical  per share data for  earnings  and  dividends  have not been
         presented  for  periods  prior to the year ended  December  31, 1995 as
         Knogo was not a publicly-held company during these periods.
**       Includes a gain on the sale of assets of $2,462.
</FN>
</TABLE>



                                       99
<PAGE>

           UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS


         The  following   unaudited  pro  forma  combined  condensed   financial
statements give effect to the Merger on a purchase accounting basis based on the
fair market  value of Video's  Common  Stock at a price of $4.02 per share,  the
estimated  fair market  value of the stock for a  reasonable  period  before and
after October 10, 1996, the announcement  date of the Merger.  Upon consummation
of the Merger,  shareholders of Knogo will own approximately 4,802,000 shares of
Sentry Common Stock based on an Exchange  Ratio of 1.2022 shares of Knogo Common
Stock in exchange for each share of Sentry Common Stock, or approximately  49.8%
of the issued and  outstanding  Sentry  Common  Stock,  plus one share of Sentry
Class A Preferred Stock.  Video  shareholders will own  approximately  4,842,000
shares  of  Sentry  Common  Stock,  or  approximately  50.2% of the  issued  and
outstanding  Sentry  Common  Stock.  Although  Video  shareholders  will  have a
majority  voting  interest in Sentry  based upon their  common  stock  ownership
percentage,  GAAP requires  consideration of a number of factors, in addition to
voting  interest,  in determining the acquiring  entity for purposes of purchase
accounting  treatment.  Such other  factors to be  considered  include:  (i) key
Sentry  management  positions  will  be held by  individuals  currently  holding
similar such positions in Knogo;  (ii) the assets,  revenues and net earnings of
Knogo  significantly  exceed  those of Video;  and (iii) the market value of the
securities  to  be  received  by  the  former  holders  of  Knogo  Common  Stock
significantly  exceeds the market value of the  securities to be received by the
former holders of Video Common Stock.  As a result of these other  factors,  and
solely for  accounting  and  financial  reporting  purposes,  the Merger will be
accounted for as a reverse acquisition of Video by Knogo.  Accordingly,  the pro
forma  financial  information  presented  herein  is  the  historical  financial
statements  of  Knogo  with  purchase  accounting  adjustments  to  reflect  the
acquisition of Video.

         The pro forma combined  condensed balance sheet assumes the Merger took
place on September  30, 1996,  whereby  Sentry  acquired all of the  outstanding
Video  Common  Stock at its fair value plus  direct  costs  incurred,  which are
estimated  to be  approximately  $2,350,000.  The pro forma  combined  condensed
statements of  operations  present  Knogo's  historical  condensed  consolidated
statements  of  operations  for the fiscal year ended  December 31, 1995 and the
nine months  ended  September  30, 1996 with  Video's  condensed  statements  of
operations for the same periods  adjusted to give effect to the Merger as if the
Merger  occurred  on January 1, 1995.  Unaudited  Pro Forma  Combined  Condensed
Financial  Information  presented  herein  reflects the  adjustments for (i) the
estimated  allocation  of  purchase  price  to the  assets  acquired,  including
goodwill and other  intangibles,  (ii) the  write-off of  non-recurring  charges
related  to  in-process  research  and  development,  and  (iii)  the  effect of
recurring charges related to the Merger,  primarily the amortization of goodwill
and other  intangibles.  The Unaudited Pro Forma  Combined  Condensed  Financial
Statements  do not reflect any expected  cost savings as a result of the Merger.
Knogo and Video are reviewing certain opportunities to reduce combined costs and
plan to eliminate duplicative  operations.  See "Business of Sentry." The annual
cost  savings  associated  with  reducing  duplicative   operating  expenses  is
estimated to be  approximately  $1,400,000  for the year ended December 31, 1995
and $890,000 for the nine months ended  September  30, 1996.  Under the purchase
accounting method, goodwill and other intangibles in the amount of approximately
$7,846,000  will be  capitalized  and  non-recurring  charges  of  approximately
$13,200,000 relating to in-process research and development will be expensed and
recorded in the quarter the Merger is  consummated.  These amounts are estimated
based on a preliminary  purchase  price  allocation  and a valuation of existing
technology and  technology  in-process.  For a discussion of Video's  in-process
research and development,  see "Business of Video -- Product  Development."  The
fair market value of Video's  technology was  determined  utilizing a discounted
cash flow approach at a discount rate of 15%. The charge for in-process research
and development  equaled its estimated current fair value based on risk adjusted
cash  flows of  specifically  identified  technologies  for which  technological
feasibility has not yet been  established  and  alternative  future uses did not
exist.  The actual amounts recorded will vary based upon completion of the final
purchase price allocations and valuation. The amortization of goodwill and other
intangibles  after the  Merger  will have an  adverse  effect on the  results of
operations of Sentry. See "Risk Factors -- Risks Related to the Merger."

         The pro forma combined condensed financial statements are presented for
illustrative  purposes  only and are not  necessarily  indicative  of either the
financial  position or results of operations  which would have been achieved had
the  Merger  been  consummated  on the dates  described  above and should not be
construed as representations of future operations.

         These pro forma combined condensed  financial  statements are based on,
and should be read in conjunction with, the historical  financial statements and
the related  notes thereto of Knogo and Video,  which are included  elsewhere in
this Joint Proxy Statement/Prospectus.


                                      100
<PAGE>

<TABLE>
                                        UNAUDITED PRO FORMA COMBINED CONDENSED BALANCE SHEET
                                                         SEPTEMBER 30, 1996
                                                           (in thousands)
<CAPTION> 
                                                                                                      Pro Forma           Pro Forma
                                                                   Knogo             Video           Adjustments           Combined
                                                                   -----             -----           -----------           --------
<S>                                                               <C>             <C>                  <C>                 <C>    
ASSETS                                                                                              
CURRENT ASSETS                                                                                      
  Cash                                                            $ 2,482         $     99             $    --             $ 2,581
  Accounts receivable                                               7,243            1,541                  --               8,784
         Net investment in sales-type leases - current                                              
         portion                                                    1,840               --                  --               1,840
  Inventories                                                       6,798            2,399                  --               9,197
  Prepaid expenses and other current assets                           504              110                  --                 614
                                                                  -------          -------              -------            -------
         Total current assets                                      18,867            4,149                                  23,016
                                                                                                    
NET INVESTMENT IN SALES-TYPE LEASES-                                                                
         non-current portion                                        1,395               --                  --               1,395
SECURITY DEVICES ON LEASE, net                                        345               --                  --                 345
PROPERTY, PLANT AND EQUIPMENT, net                                  8,950              370                (100)(a)           9,220
GOODWILL AND OTHER INTANGIBLES                                        349              732               7,876 (b)           8,957
OTHER ASSETS                                                          579               --                  --                 579
                                                                  -------          -------             -------             -------
                                                                  $30,485          $ 5,251             $ 7,776             $43,512
                                                                  =======          =======             =======             =======
                                                                                                    
LIABILITIES AND SHAREHOLDERS' EQUITY                                                                
CURRENT LIABILITIES                                                                                 
  Accounts payable                                                $   999          $ 1,660             $    --              $2,659
  Notes payable                                                        --            2,110                  --               2,110
  Accrued liabilities                                               2,834              323               2,650 (c)(d)        5,807
  Obligations under capital leases - current portion                  304                -                  --                 304
  Deferred revenue                                                    313               14                  --                 327
                                                                  -------          -------             -------             -------
         Total current liabilities                                  4,450            4,107               2,650              11,207
                                                                                                    
OTHER LONG-TERM LIABILITIES                                           283               16                  --                 299
DEFERRED INCOME TAXES                                                 435               --                  --                 435
MINORITY INTEREST IN SUBSIDIARY                                       459               --                  --                 459
                                                                                                    
REDEEMABLE CUMULATIVE PREFERRED STOCK                                  --               --              24,010 (e)          24,010
                                                                                                    
SHAREHOLDERS' EQUITY                                                                                
         Common stock and additional paid-in capital               21,136            7,911             (12,467)(e)          16,580
  Retained earnings/ (Accumulated deficit)                          3,722           (6,783)             (6,417)(f)(g)       (9,478)
                                                                  -------          -------            --------             -------
                                                                   24,858            1,128             (18,884)              7,102
                                                                  -------          -------            --------             -------
                                                                  $30,485          $ 5,251            $  7,776             $43,512
                                                                  =======          =======            ========             =======

<FN>
See accompanying notes to unaudited pro forma combined condensed financial statements.
</FN>
</TABLE>



                                      101
<PAGE>

<TABLE>
                                   UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS
                                                FOR THE YEAR ENDED DECEMBER 31, 1995
                                                           (in thousands)

                                                                                                 Pro Forma       Pro Forma
                                                                       Knogo       Video        Adjustments       Combined
                                                                       -----       -----        -----------       --------
<S>                                                                   <C>         <C>            <C>               <C>    
REVENUES                                                              $29,404     $  8,610       $   --            $38,014

COSTS AND EXPENSES
 Cost of sales                                                         17,660        7,343           --             25,003
 Selling, general and administrative expenses                           8,235        2,439           (20)(i)        10,654
 Amortization of goodwill and other intangibles                           --           --          1,125 (h)         1,125
 Research and development                                               1,537          607           --              2,144
 Interest (income) expense                                                 31          (98)          --                (67)
                                                                      -------       ------       -------           -------

                                                                       27,463       10,291          1,105           38,859
                                                                      -------       ------        -------          -------

INCOME (LOSS) BEFORE INCOME TAXES                                       1,941       (1,681)       (1,105)             (845)

PROVISION FOR INCOME TAXES                                                210          --            (60)(j)           150
                                                                      -------       ------       -------           -------

NET INCOME (LOSS)                                                       1,731       (1,681)       (1,045)             (995)

PREFERRED STOCK DIVIDENDS                                                 --           --         (1,212)(k)        (1,212)
                                                                      -------       ------        ------            ------

NET INCOME (LOSS) AVAILABLE TO COMMON
 SHAREHOLDERS                                                         $ 1,731      $(1,681)      $(2,257)          $(2,207)
                                                                      =======      =======       =======           =======

NET INCOME (LOSS) PER SHARE                                           $  0.29      $ (0.36)                        $ (0.23)
                                                                      =======      =======                         =======

WEIGHTED AVERAGE COMMON SHARES                                          5,887        4,674                           9,400
                                                                      =======      =======                         =======


<FN>
See accompanying notes to unaudited pro forma combined condensed financial statements.
</FN>
</TABLE>


                                       102
<PAGE>

<TABLE>
                                   UNAUDITED PRO FORMA COMBINED CONDENSED STATEMENT OF OPERATIONS
                                            FOR THE NINE MONTHS ENDED SEPTEMBER 30, 1996
                                                           (in thousands)
<CAPTION>
                                                                                                 Pro Forma        Pro Forma
                                                                      Knogo         Video       Adjustments       Combined
                                                                     -------       -------      -----------       --------
<S>                                                                  <C>           <C>           <C>               <C>    
REVENUES                                                             $18,180       $ 2,000       $    --           $20,180

COSTS AND EXPENSES
  Cost of sales                                                       11,595         3,085            --            14,680
  Selling, general and administrative expenses                         5,387         1,546           (15)(i)         6,918
  Amortization of goodwill and other intangibles                          --            --           844 (h)           844
  Research and development                                             1,069           321            --             1,390
  Interest (income) expense                                              (64)           83            --                19
                                                                     -------       -------       -------           -------

                                                                      17,987         5,035            829           23,851
                                                                     -------       -------       -------           -------

OPERATING PROFIT (LOSS)                                                  193        (3,035)         (829)           (3,671)

OTHER INCOME                                                           2,462            --            --             2,462
                                                                     -------       -------       -------           -------

INCOME (LOSS) BEFORE INCOME TAXES                                      2,655        (3,035)         (829)           (1,209)

PROVISION FOR INCOME TAXES                                               664            --          (568)(j)            96
                                                                     -------       -------       -------           -------

NET INCOME (LOSS)                                                      1,991        (3,035)         (261)           (1,305)

PREFERRED STOCK DIVIDENDS                                                 --            --          (949)(k)          (949)
                                                                     -------       -------       -------           -------

NET INCOME (LOSS) AVAILABLE TO COMMON
  SHAREHOLDERS                                                       $ 1,991       $(3,035)      $(1,210)          $(2,254)
                                                                     =======       =======       =======           =======

NET INCOME (LOSS) PER SHARE                                          $  0.33       $ (0.63)                        $ (0.24)
                                                                     =======       =======                         =======

WEIGHTED AVERAGE COMMON SHARES                                         6,101         4,809                           9,604
                                                                     =======       =======                         =======


<FN>
See accompanying notes to unaudited pro forma combined condensed financial statements.
</FN>
</TABLE>


                                      103
<PAGE>

      NOTES TO UNAUDITED PRO FORMA COMBINED CONDENSED FINANCIAL STATEMENTS

         Under  purchase  accounting,  the total purchase price was allocated to
Video's  assets  and   liabilities   based  upon  their  relative  fair  values.
Allocations  are subject to valuations as of the date of the  acquisition  based
upon appraisal and other studies which are not yet completed. The purchase price
and  preliminary  allocation  of the  purchase  price to  assets  purchased  and
liabilities assumed are as follows:


                                                                   (Dollars in
                                                                    Thousands)

Purchase price                                                        $19,454
Acquisition costs                                                       2,350
                                                                     --------

Total estimated purchase price                                        $21,804
                                                                     ========

Historical net book value                                             $ 1,128
Estimated write-down of property, plant and equipment                    (100)
Liability for restructuring and integration costs                        (300)
Goodwill and other intangibles                                          7,876
In-process research and development                                    13,200
                                                                     --------

                                                                      $21,804
                                                                     ========



         The Unaudited Pro Forma Combined  Condensed  Balance Sheet gives effect
to the following pro forma adjustments:

(a)      Represents  the  write-down  of  property,  plant and  equipment to its
         estimated fair value at the balance sheet date.

(b)      Represents  goodwill and other  intangible  assets  resulting  from the
         Merger to be amortized over a seven year useful life.

(c)      The  Company  expects  to incur  costs  of  approximately  $300,000  in
         connection  with  the   implementation  of  a  formal  plan  to  reduce
         duplicative  operating expenses.  The charge primarily relates to costs
         associated  with  combining  the  operations  of the two  companies and
         includes severance benefits, closure of duplicate and excess facilities
         and other expenses related to the Merger.  This amount is a preliminary
         estimate only and therefore is subject to change.

(d)      Represents  an accrual of  approximately  $2,350,000  for direct  costs
         related to the Merger.

(e)      As of September 30, 1996, Knogo had outstanding approximately 5,773,000
         shares  of  common  stock  and  Video  had  outstanding   approximately
         4,842,000  shares  of  common  stock.  Based  upon the  Exchange  Ratio
         described  above,  as  of  September  30,  1996,   Sentry  would  issue
         approximately   4,802,000   shares  of   Sentry   Common   Stock   plus
         approximately  4,802,000  shares of Sentry  Class A Preferred  Stock in
         exchange for all the outstanding shares of Knogo Common Stock and would
         issue approximately 4,842,000 shares of Sentry Common Stock in exchange
         for all the outstanding shares of Video Common Stock.

(f)      Represents the elimination of Video's historical accumulated deficit.

(g)      Represents   the   write-off  of  acquired   in-process   research  and
         development upon the consummation of the Merger currently  estimated to
         be $13,200,000. The actual amount of the write-off is subject to change
         based on the  completion  of the valuation of existing  technology  and
         technology  in-process.  This adjustment is excluded from the Unaudited
         Pro  Forma  Combined  Condensed  Statement  of  Operations  due  to the
         non-recurring nature of this expense.



                                      104
<PAGE>

The Unaudited Pro Forma Combined Condensed  Statements of Operations give effect
to the following pro forma adjustments:

(h)      Represents  the   amortization   of  goodwill  and  other   intangibles
         calculated as of January 1, 1995 over an estimated useful life of seven
         years.  Goodwill  and other  intangibles  and the related  amortization
         expense  are  subject  to  possible   adjustment   resulting  from  the
         completion of the final  purchase price  adjustments  and the valuation
         analysis.

(i)      Represents  the  adjustment  to  depreciation   expense  based  on  the
         estimated  fair value of  property,  plant and  equipment at January 1,
         1995 over the current estimated useful lives.

(j)      Represents  the  adjustment  to income tax  expense  based on pro forma
         income  before  income  taxes.  The provision for income taxes on a pro
         forma  combined  basis  primarily  reflects the income taxes payable on
         Sentry's  earnings  generated  in  Puerto  Rico  that  cannot be offset
         against Sentry's U.S. operations.

(k)      Represents dividends accrued on the Sentry Class A Preferred Stock. The
         Sentry  Class A Preferred  Stock  dividends  are  cumulative  non-cash,
         payment-in-kind dividends,  payable at a rate of 5% per annum of the $5
         face value per share.


                                      105
<PAGE>

       COMPARISON OF STOCKHOLDERS' RIGHTS WITH RESPECT TO SENTRY AND VIDEO

         In  connection  with  the  Merger,   the  Video  shareholders  will  be
converting  their  shares of Video  Common  Stock into  shares of Sentry  Common
Stock.  The charter  and bylaws of Sentry  differ from those of Video in several
significant respects.  Sentry is a Delaware corporation and Video is a Minnesota
corporation  and because of the  differences  between the DGCL and the Minnesota
Act the rights of a holder of Video  Common  Stock  differ  from the rights of a
holder of Sentry  Common  Stock.  Below is a  summary  of some of the  important
differences  between the charter  documents  of Sentry and Video and between the
DGCL  and the  Minnesota  Act.  It is not  practical  to  summarize  all of such
differences in this Joint Proxy Statement/Prospectus,  but some of the principal
differences which could materially affect the rights of shareholders include the
following:

Liability and Indemnification

   
         The DGCL permits a corporation's  certificate of incorporation to limit
a director's  exposure to monetary liability for breach of duty except for (a) a
breach of duty of loyalty,  (b) failure to act in good  faith,  (c)  intentional
misconduct,  (d)  violation of law or willful or negligent  violation of certain
provisions  in the DGCL  imposing  certain  requirements  with  respect to stock
repurchases,  redemptions and dividends or (e) for any other  transactions  from
which the directors derive an improper personal benefit.  The Sentry Certificate
of Incorporation does contain such a provision  limiting a director's  liability
for  monetary  damages  for  breach  of  fiduciary  duty to the  fullest  extent
permitted  by the DGCL,  and  provides  that any repeal or  modification  by the
stockholders of the limitation on director  liability will not adversely  affect
any right or protection existing at the time of such repeal or modification.
    

         The Minnesota Act permits a corporation's  articles of incorporation to
limit or eliminate a  directors'  liability  for monetary  damages for breach of
fiduciary duty except for (a) any breach of the duty of loyalty,  (b) failure to
act in good faith, (c) intentional misconduct, (d) knowing violation of law, (e)
illegal  distributions,  (f) any transaction  from which the director derived an
improper  personal  benefit,  or (g) any act or omission  occurring prior to the
effective  date of the  provision in the articles of  incorporation  limiting or
eliminating  liability.  Video's Articles of  Incorporation  include a provision
eliminating  a  director's  liability  to the fullest  extent  permitted  by the
Minnesota Act.

   
         The DGCL permits a corporation  to indemnify its directors and officers
against  expense,  judgments,  fines and amounts paid in settlement  incurred by
them  in  connection  with  any  pending,  threatened  or  completed  action  or
proceeding. The Sentry Bylaws provide that Sentry shall indemnify its directors,
officers,  other  employees,  and agents to the fullest extent permitted by law.
The Sentry  Bylaws also permit it to secure  insurance  on behalf of an officer,
director,  employee or other agent for any  liability  arising out of his or her
actions  in  such  capacity,   regardless  of  whether  the  DGCL  would  permit
indemnification.
    

         The Minnesota Act requires a  corporation  to indemnify its  directors,
officers,  and  employees  who are  made or  threatened  to be made  party  to a
proceedings  by  reasons  of the former or  present  capacity  of the  director,
officer or employees,  against  judgments,  penalties,  fines,  settlements  and
reasonable  expenses,  the Minnesota  Act permits a  corporation  to prohibit or
limit  indemnification  by so providing in its Articles of  Incorporation or its
Bylaws.  Video has not limited the statutory  indemnification in its articles of
incorporation,  however,  and its Bylaws state that Video shall  indemnify  such
persons  for  such  expenses  and  liabilities,   in  such  manner,  under  such
circumstances,  and to such  extent,  as may be  required  or  permitted  as are
provided by law.

Dividends

         The DGCL  generally  permits  dividends  to be paid out of any surplus,
defined  as the  excess of the net  assets of the  corporation  over the  amount
determined to be the capital of the corporation by the board of directors (which
amount  cannot be less than the  aggregate  par  value of all  issued  shares of
capital  stock).  The DGCL also permits a dividend to be paid out of net profits
of the current or the proceeding  fiscal years,  or both,  unless net assets are
less than the capital of all outstanding shares of preferred stock.


                                      106
<PAGE>

         Under the Minnesota Act a corporation  may make a distribution  only if
the board of directors has  determined  that the  corporation  is able,  and the
corporation is in fact able, to pay its debts in the ordinary course of business
after making the distribution.  A distribution may be made to holders of a class
or series of shares  only if all amounts  payable to holders of shares  having a
preference  are paid (except for those having  waived  rights to payment) and if
payment of such  distribution  does not reduce the net assets of the corporation
below the aggregate  preferential  amount payable upon  liquidation  (unless the
distribution  is made to shareholders in the order of and to the extent of their
respective  priorities).  Although Video's Articles of Incorporation  and Bylaws
provide that its  directors may declare  dividends  whenever and in such amounts
as, in their  opinion,  the  condition  and affairs of the company  shall render
advisable,  Video is  currently  prohibited  from  paying  dividends  under  its
Financing Agreement, dated March 29, 1996, with Republic Acceptance Corporation.

         Accordingly,  Sentry's  ability to legally pay  dividends may differ in
certain circumstances from that of Video. Sentry has not paid any cash dividends
on its equity  securities and the Sentry Board  currently  intends to retain all
earnings for use in Sentry's business.

Special Meetings of the Stockholders

   
         The DGCL  provides  that special  meetings of the  stockholders  may be
called by the board of  directors  or by such other  person or persons as may be
authorized in the certificate of incorporation  or bylaws.  Presently the Sentry
Bylaws  provide  that the  special  meetings  may be called by a majority of the
Board of Directors or by the Chairman of the Board.
    

         The Minnesota Act provides  that special  meetings of the  shareholders
may be called by the chief executive officer;  the chief financial officer;  two
or more directors, any person authorized in the articles of incorporation or the
bylaws to do so; or a  shareholder  or  shareholders  holding 10% or more of the
voting  power of all  shares  entitled  to vote  (except  in the case of special
shareholder  meetings  called to address any action related to  facilitating  or
effecting a business  combination,  which requires a shareholder or shareholders
holding  25% or more of the  voting  power).  Video's  Bylaws  provide  that the
special meetings may be called in accordance with Minnesota law.

Charter Amendments

         The DGCL requires that amendments to a certificate of  incorporation be
approved by the  affirmative  vote of  stockholders  entitled to cast at least a
majority of the votes which all  stockholders  are entitled to cast,  unless the
certificate of incorporation requires approval by a greater proportion of votes.
In addition,  an amendment must be separately approved by a majority vote of all
outstanding  shares of any class,  whether or not otherwise entitled to vote, if
the  amendment  would  increase or decrease the  aggregate  number of authorized
shares of such class,  increase or decrease  the par value of the shares of such
class, or change the powers, preferences or special rights of the shares of such
class so as to affect them adversely.

         The  Minnesota  Act is similar  to the DGCL,  and  entitles  holders of
shares of a class or series to vote as a class or series on certain  amendments,
including  amendments which would (a) change the number of authorized  shares of
such class or series,  (b) change or adversely affect the rights and preferences
of such class or series,  (c) create a new class or series of shares with rights
and  preferences  prior and superior to such class or series,  or (d) rights and
preferences of a class or series with prior and superior  rights and preferences
to such class or series.

Preemptive Rights

   
         Under  the  DGCL,  security  holders  of a  corporation  only have such
preemptive  rights  as  may be  provided  in the  corporation's  certificate  of
incorporation.  The Sentry  Certificate  of  Incorporation  does not provide any
preemptive rights to any security holders.
    

         The Minnesota  Act provides  that all security  holders are entitled to
preemptive  rights  unless the articles of  incorporation  specifically  deny or
limit preemptive  rights.  Video's Articles of Incorporation  specifically  deny
preemptive rights to its security holders.


                                      107
<PAGE>

Voting Rights Generally

   
         Under both the DGCL and the Minnesota Act, the affirmative  vote of the
majority  of shares  present  in person or  represented  by proxy at a duly held
meeting at which a quorum is present and entitled to vote on the subject  matter
is deemed to be the act of the stockholders, unless the DGCL, the Minnesota Act,
the Sentry Certificate of Incorporation,  the Sentry Bylaws, Video's Articles of
Incorporation or Video's Bylaws specify a different voting requirement.


         The Sentry  Certificate  of  Incorporation  does not  contain any super
majority voting requirements.  The Sentry Certificate of Incorporation  provides
for one class of Common Stock.

         Except as may be otherwise  provided in a preferred stock  designation,
each holder of Sentry  Common  Stock will be entitled to one vote on each matter
submitted to a vote at a meeting of stockholders for each share of Sentry Common
Stock held of record by such holder as of the record date for such meeting.  The
Sentry  Bylaws  provide  that the holders of a majority of the stock  issued and
outstanding  and  entitled  to  vote at  such  meeting,  present  in  person  or
represented  by  proxy,  will  constitute  a  quorum  at  all  meetings  of  the
stockholders for the transaction of business thereat.
    

         Video's Bylaws provide that the affirmative  vote of the holders of the
greater of (1) a majority of the voting power of the shares present and entitled
to vote on the  particular  item of  business,  or (2) a majority  of the voting
power of the minimum number of the shares entitled to vote that would constitute
a quorum for the  transaction of business at the meeting is deemed to be the act
of the shareholders.

Action by Written Consent

         Under  the  DGCL,   unless   otherwise   provided  in  a  corporation's
certificate  of  incorporation,  any  action  that may be taken at any annual or
special meeting of stockholders may be taken without a meeting and without prior
notice, if a consent in writing, setting forth the action so taken, is signed by
the holders of  outstanding  shares  having not less than the minimum  number of
votes that would be  necessary to authorize or taken such action at a meeting at
which all shares entitled to vote thereon were present and voted.

   
         The  Sentry   Certificate   of   Incorporation   does  not  permit  the
stockholders of the corporation to take action by written consent.
    

         Under the Minnesota  Act, any action  required or permitted to be taken
in any meeting of the  shareholders  may be taken without a meeting by a written
action signed by all of the shareholders. Any action required or permitted to be
taken by the board of directors may be taken by written  action signed by all of
the directors,  however,  if a company's  articles of incorporation so provides,
any action other than an action requiring  shareholder  approval may be taken by
written  action signed by the number of directors that would be required to take
the same action at a meeting of the board of directors  which all directors were
present.  Video's  Articles  of  Incorporation  permit  the Video  Board to take
written  action  that is  signed  by less  than all of the  directors  under the
circumstances permitted by the Minnesota Act.

Voting in the Election of Directors

         In an election  of  directors  for  corporations  for which  cumulative
voting is provided,  each share of stock normally having one vote is entitled to
a number of votes equal to the number of directors to be elected.  A stockholder
may then cast all such votes for a single  candidate or may allocate  them among
as many candidates as the stockholder may choose. Without cumulative voting, the
holders of a majority of shares  voting in the election of directors  would have
the power to elect  all the  directors  to be  elected,  and no person  could be
elected without the support of holders of a majority of the shares.

         Under  the DGCL,  cumulative  voting is not  mandatory  and  cumulative
voting rights must be provided in a corporation's  certificate of  incorporation
if  stockholders  are to be  entitled  to  cumulative  voting  rights.  The DGCL
requires  that  elections of directors be by written  ballot,  unless  otherwise
provided in a corporation's certificate of incorporation.


                                      108
<PAGE>

   
         The Sentry  Certificate of Incorporation  and Bylaws do not require the
election of directors by written ballot. The Sentry Certificate of Incorporation
does not provide for cumulative voting.
    

         Under  the  Minnesota  Act,  cumulative  voting  for  the  election  of
directors is required unless  specifically  limited or denied in the articles of
incorporation.  Video's Articles of Incorporation  specifically  deny cumulative
voting rights to the Video shareholders.

Number and Qualification of Directors

         Under the  DGCL,  the  minimum  number of  directors  is one.  The DGCL
permits the board of directors  alone to change the  authorized  number,  or the
range,  of directors by amendment to the bylaws,  unless the  directors  are not
authorized in the  certificate of  incorporation,  in which case a change in the
number  of  directors  may be made  only  upon  approval  of such  change by the
stockholders. The Sentry Board currently consists of five directors who shall be
elected by the holders of Sentry  Common  Stock with each share  entitled to one
vote per share.

         Under the Minnesota Act, the minimum number of directors is one and the
only  qualification  for  directors  is that they must be natural  persons.  The
Minnesota  Act permits the number of  directors  to be fixed by the  articles of
incorporation  or  bylaws,  and the  number of  directors  may be  increased  or
decreased by the  shareholders or the board of directors in the manner permitted
by  the  articles  of  incorporation  or  bylaws.  Video's  Bylaws  require  the
shareholders or Video Board to establish the number of directors and permits the
number of directors to be increased or decreased by either the  shareholders  or
the  Video  Board  from  time-to-time,  provided  that the  Video  Board may not
decrease  the  number of  directors  below the  number  last  designated  by the
shareholders.

Classification of Board

         A classified  board is one in which a certain  number,  but not all, of
the directors are elected on a rotating basis each year. This method of electing
directors makes changes in the composition of the board of directors, and thus a
potential  change in control of a  corporation,  a lengthier and more  difficult
process.

         The  DGCL  permits,  but  does  not  require,  a  classified  board  of
directors,  with  staggered  terms under  which  one-half  or  one-third  of the
directors are elected for terms of two or three years, respectively.

   
         The Sentry Certificate of Incorporation provides for a classified Board
of Directors.  Directors will be classified,  with respect to the time for which
they  severally hold office,  into three  classes,  as nearly equal in number as
possible,  designated Class I, Class II and Class III. Directors first appointed
to Class I will hold  office for a term  expiring  at the first  annual  meeting
following the filing of the Sentry Certificate of Incorporation; directors first
appointed to Class II will hold office for a term  expiring at the second annual
meeting  following  the  filing  of the  Sentry  Certificate  of  Incorporation;
directors  first  appointed to Class III will hold office for a term expiring at
the third  annual  meeting  following  the filing of the Sentry  Certificate  of
Incorporation.
    

         The Minnesota Act permits,  but does not require, a classified board of
directors, with the terms of any such classes to be provided for in the articles
of incorporation and bylaws. Neither Video's Articles of Incorporation or Bylaws
provide for the division of the Video Board into separate classes.

Removal of Directors

         Under  the  DGCL,  a  director  of a  corporation  that does not have a
classified  board of  directors  or  cumulative  voting may be  removed  with or
without cause with the approval of a majority of the outstanding shares entitled
to vote at an  election  of  directors.  In the  case  of a  corporation  having
cumulative  voting,  if less than the entire board is to be removed,  a director
may not be removed  without cause unless the number of shares voted against such
removal would not be sufficient to elect the director under cumulative voting. A
director of a  corporation  with a classified  board of directors may be removed
only for cause, unless the certificate of incorporation otherwise provides.

   
         The Sentry Certificate of Incorporation provides for a classified board
of  directors;  therefore a Sentry  director may be removed only with cause.  In
addition, the Sentry Certificate of Incorporation provides that a director may
    


                                      109
<PAGE>

be removed for cause only upon the  affirmative  vote of the holders of at least
80% of the stock entitled to vote thereon.

         Under the Minnesota Act, a director of a corporation that does not have
cumulative  voting may be removed with or without cause with the approval of the
holders of a majority of the outstanding  shares entitled to vote at an election
of directors.  In the case of a corporation  having  cumulative  voting, if less
than the entire board is to be removed,  a director  may not be removed  without
cause  unless the  number of shares  voted  against  such  removal  would not be
sufficient to elect the director under cumulative voting. Since Video's Articles
of Incorporation do not permit cumulative  voting,  the holders of a majority of
the shares of Special Meeting may remove a Video director at any time. Under the
Minnesota Act, a director may be removed by the  affirmative  vote of a majority
of the directors  present at a meeting of the board of directors with or without
cause if that  director  was named by the  board to fill a  vacancy  and was not
subsequently re-elected by the shareholders.

Filling Vacancies on the Board of Directors

         Under the DGCL, vacancies and newly created directorships may be filled
by a majority  of the  directors  then in office,  although  less than a quorum,
unless  otherwise  provided  in the  certificate  of  incorporation  or  bylaws.
However, if the certificate of incorporation  directs that a particular class is
to elect such director,  such vacancy may be filled only by the other  directors
elected by such class.  If, at the time of filling any vacancy or newly  created
directorship,  the directors then in office  constitute  less than a majority of
the whole board as constituted  immediately prior to such increase, the Delaware
Court of Chancery may, upon application of stockholders  holding at least 10% of
the  total  number  of  shares  outstanding  having  the  right to vote for such
directors,  order an  election  to be held to fill any such  vacancies  or newly
created directorship or to replace the directors chosen by the directors then in
office.

         Sentry's  Board of Directors  currently  consist of five  directors who
shall be elected by the holders of Sentry Common Stock with each share of Sentry
Common Stock entitled to one vote per share.

         Under the Minnesota Act, unless  different rules for filling  vacancies
are provided for in the articles of  incorporation  or bylaws,  vacancies on the
board  of   directors   resulting   in  the  death,   resignation,   removal  or
disqualification  of a  director  may be  filled  by the  affirmative  vote of a
majority  of the  remaining  directors,  even  though  less than a  quorum,  and
vacancies  resulting  from a  newly-created  directorship  may be  filled by the
affirmative  vote of a  majority  of the  directors  serving  at the time of the
increase.  The shareholders may also elect a new director to fill a vacancy that
is created by the removal of a director  by the  shareholders.  Neither  Video's
Articles of Incorporation  nor Bylaws created different rules for the filling of
vacancies on the Video Board.

Transactions Involving Directors

         Under the DGCL, no contract or  transaction  between a corporation  and
one or more of its directors or officers, or between a corporation and any other
entity  in which one or more of its  directors  or  officers  are  directors  or
officers,  or have a financial interest, is void or voidable if (i) the material
facts as to the director's or officer's  relationship  or interest and as to the
contract or  transaction  are  disclosed  or known to the board of  directors or
committee,  which authorizes the contract or transaction by the affirmative vote
of a majority of the disinterested directors;  (ii) the material facts as to the
director's  or  officer's  relationship  or interest  and as to the  contract or
transaction are disclosed or known to the stockholders entitled to vote thereon,
and the contract or transaction is specifically approved by the stockholders; or
(iii) the contract or transaction  is fair as to the  corporation as of the time
it is  authorized,  approved or ratified by the board of directors,  a committee
thereof,  or the  stockholders.  A corporation may make loans to,  guarantee the
obligations  of or otherwise  assist its officers or other employee and those of
this subsidiaries,  including directors who are also officers or employees, when
such action,  in the judgment of the  directors,  may  reasonably be expected to
benefit the corporation.

         Under  the  Minnesota  Act,  no  contract  or  transaction   between  a
corporation  and one or more of its directors,  or between a corporation and any
other entity in which one or more of its directors are directors or officers, or
have a financial  interest,  is void or voidable if (i) the material facts as to
the  director's  relationship  or interest and as to the contract or transaction
are disclosed or known to the board of directors or committee,  which authorizes
the  contract  or  transaction  by the  affirmative  vote of a  majority  of the
disinterested   directors;   (ii)  the  material  facts  as  to  the  director's
relationship  or interest and to the contract or  transaction  are  disclosed or
known  to the  shareholders  



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<PAGE>

entitled to vote  thereon,  and the  contract  or  transaction  is  specifically
approved in good faith by (a) the holders of  two-thirds  of the shares owned by
persons other than the interested  director or directors,  or (b) the holders of
all of the  outstanding  shares by the  shareholders;  or (iii) the  contract or
transaction  is fair and  reasonable as to the  corporation as of the time it is
authorized, approved or ratified by the board of directors, a committee thereof,
or the shareholders.

Mergers, Tender Offers and Sales or Substantially All of a Corporation's Assets

         Under the DGCL, the principal terms of a merger  generally  require the
approval of the  stockholders  of each of the merging  corporations,  but do not
require the approval of the  stockholders of any parent  corporation,  even when
the parent  corporation's  securities  are to be used as  consideration  for the
merger.   Unless   otherwise   required  in  a   corporation's   certificate  of
incorporation,  the DGCL does not require a  stockholder  vote of the  surviving
corporation in a merger if (i) the merger  agreement does not amend the existing
certificate  of  incorporation,  (ii) each  share of the  surviving  corporation
outstanding  before the merger is an  identical  outstanding  or treasury  share
after the merger, and (iii) either no shares of the surviving corporation and no
securities  convertible  into such  stock are to be issued in the  merger or the
number of shares to be issued by the  surviving  corporation  in the merger does
not exceed 20% of the shares  outstanding  immediately  prior to the  merger.  A
disposition of substantially all of a corporation's assets requires the approval
of the outstanding shares of the corporation.

         Under the  Minnesota  Act, the  principal  terms of a merger  generally
require the approval of the holders of a majority of the shareholders of each of
the merging corporations, but do not require the approval of the shareholders of
any parent corporation,  even when the parent corporation's securities are to be
used  as  consideration  for  the  merger.   Unless  otherwise   required  in  a
corporation's  articles of  incorporation,  the Minnesota Act does not require a
shareholder  vote of the  surviving  corporation  in a merger if (i) the  merger
agreement does not amend the existing articles of incorporation; (ii) each share
of the  surviving  corporation  outstanding  before the  merger is an  identical
outstanding share after the merger;  and (iii) either no shares of the surviving
corporation  and no  securities  convertible  into stock are to be issued in the
merger or the number of shares to be issued by the surviving  corporation in the
merger does not exceed 20% of the shares  outstanding  immediately  prior to the
merger.  Under the  Minnesota  Act,  a  disposition  of  substantially  all of a
corporation's  assets  requires the approval of the holders of a majority of the
outstanding shares of the corporation.

Appraisal Rights

         Under  the  DGCL,  the  right  to  receive  the  fair  market  value of
dissenting shares is made available to stockholders of a constituent corporation
in a merger or  consolidation  effected  under the DGCL.  Dissenters'  rights of
appraisal are not  available (i) with respect to the sale,  lease or exchange of
all or substantially all of the assets of a corporation,  (ii) with respect to a
merger or  consolidation  by a corporation the shares of which are either listed
on a national  securities  exchange or  designated  as a national  market system
security on an  interdealer  quotation  system by the  National  Association  of
Securities  Dealers,  Inc.  or are held of record by more than 2,000  holders if
such stockholders receive only shares of the surviving  corporation or shares of
any other corporation which are either listed on a national  securities exchange
or held of record by more than 2,000  holders,  plus cash in lieu of  fractional
shares,  or (iii) to stockholders of a parent  corporation  that is not itself a
constituent corporation in a merger transaction.

   
         The Sentry  Certificate of  Incorporation  and the Sentry Bylaws do not
contain any additional provisions relating to dissenters' rights of appraisal.
    

         For a description of appraisal  rights provided by the Minnesota Act in
the event of a merger, see "THE MERGER -- Dissenters' Rights." The Minnesota Act
also makes appraisal rights available to dissenting shareholders in the event of
certain  actions  including:  (i) an amendment of the articles of  incorporation
that  materially and adversely  affects the rights and preferences of the shares
of the dissenting  shareholder in certain  respects;  (ii) a sale or transfer of
all or substantially  all of the assets of the corporation;  and (iii) any other
corporation  action  with  respect  to  which  the  corporation's   articles  of
incorporation  or  bylaws  given  dissenting  shareholders  the  right to obtain
payment for their shares.  Video's Articles of  Incorporation  and Bylaws do not
grant any other appraisal rights.

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<PAGE>

Anti-Takeover Provisions; Transactions with Interested Stockholders

         Section 203 of the DGCL ("Section 203"), subject to certain exceptions,
prohibits a Delaware  corporation from engaging in any business combination with
any interested  stockholder  for a period of three years following the date that
such stockholder  became an interested  stockholder,  unless:  (i) prior to such
date,  the board of directors of the  corporation  approved  either the business
combination or the  transaction  which resulted in the  stockholder  becoming an
interested stockholder, (ii) upon consummation of the transaction which resulted
in  the  stockholder   becoming  an  interested   stockholder,   the  interested
stockholder  (as defined  below)  owned at least 85% of the voting  stock of the
corporation  outstanding at the time the  transaction  commenced,  excluding for
purposes of determining the number of shares  outstanding those shares owned (x)
by persons who are directors  and also officers and (y) by employee  stock plans
in which employee participants do not have the right to determine confidentially
whether shares held subject to the plan will be tendered in a tender or exchange
offer;  or (iii) on or  subsequent  to such date,  the business  combination  is
approved  by the board of  directors  and  authorized  at an  annual or  special
meeting of stockholders,  and not by written consent, by the affirmative vote of
at least  66 2/3% of the  outstanding  voting  stock  which is not  owned by the
interested  stockholder.  Section 203 defines a business combination to include:
(i) any merger or  consolidation  involving the  corporation  and the interested
stockholder;  (ii) any sale, transfer, pledge or other disposition involving the
interested  stockholder of 10% or more of the assets of the  corporation;  (iii)
subject to certain exceptions,  any transaction which results in the issuance or
transfer by the  corporation  of any stock of the  corporation to the interested
stockholder; (iv) any transaction involving the corporation which has the effect
of increasing the proportionate share of the stock of any class or series of the
corporation beneficially owned by the interested stockholder; or (v) the receipt
by the interested stockholder of the benefit of any loans, advances, guarantees,
pledges or other financial  benefits provided by or through the corporation.  In
general, Section 203 defines an "interested stockholder" as any entity or person
beneficially  owning fifteen percent or more of the outstanding  voting stock of
the  corporation  and any entity or person  affiliated  with or  controlling  or
controlled by such entity or person. A Delaware  corporation may elect not to be
subject to Section 203 by having its  stockholders  approve an  amendment to its
certificate of incorporation or bylaws to such effect.  Sentry has not made such
an election and,  therefore,  Section 203 may have an anti-takeover  effect with
respect to Sentry.

         The Minnesota Act requires approval by the  disinterested  shareholders
of any "control share  acquisition" of stock of an "issuing public  corporation"
if an acquiror exceeds  specified  levels of ownership (20%, 33-1/3% and 50%) of
the stock of the target corporation. This provision essentially requires a proxy
contest to approve such share acquisitions and delays the acquiror's purchase up
to 55  days  while  a  special  shareholders'  meeting  is  held  to vote on the
acquisition.  The definition of "control share acquisition" excludes cash tender
offers for all  outstanding  shares if the offer has been approved in advance by
the board of directors of the target  corporation,  and  acquisition by employee
benefit plans.

         The   Minnesota   Act   restricts   transactions   with  a  shareholder
("interested  shareholder")  acquiring  10% or more of the  shares of a publicly
held (i.e., subject to the reporting  requirements of the Exchange Act) "issuing
public  corporation"  unless the share  acquisition or the  transaction has been
approved by the corporation's board of directors prior to the acquisition of the
10% interest.  An "issuing  public  corporation"  is a corporation  which has at
least 50  shareholders.  For four  years  after the 10%  threshold  is  exceeded
(absent prior board approval),  the corporation cannot enter into a merger, sale
of substantial assets, loan,  substantial issuance of stock, plan of liquidation
or reincorporation involving the interested shareholder or its affiliates.

Dissolution

         Under the DGCL,  unless the board of  directors  approves a proposal to
dissolve a corporation, the dissolution must be approved by stockholders holding
100% of the  total  voting  power  of the  corporation.  If the  dissolution  is
initiated by the board of  directors,  it need only be approved by a majority of
the corporation's stockholders.

         Under the Minnesota Act,  shareholders holding 50% or more of the total
voting  power may  authorize a  corporation's  dissolution,  with or without the
approval of the corporation's board of directors.


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<PAGE>

       COMPARISON OF STOCKHOLDERS' RIGHTS WITH RESPECT TO SENTRY AND KNOGO

         The following is a summary of certain  differences  between  holders of
Sentry  capital  stock  and  holders  of  Knogo  capital  stock.  The  following
discussion  is not  intended to be complete and is qualified by reference to the
DGCL,  the  certificates  of   incorporation   (including  each  certificate  of
designations  forming a part  thereof)  and  bylaws of each of Sentry and Knogo.
Copies  of the  Sentry  Certificate  of  Incorporation  and  Sentry  Bylaws,  in
substantially  the forms to be adopted at the  Effective  Time,  are attached to
this Joint Proxy Statement/Prospectus as Appendices F and G, respectively.

         Sentry  and  Knogo  are both  organized  under the laws of the State of
Delaware.  Any  differences,  therefore,  in the rights of holders of (i) Sentry
Common Stock and/or  Sentry Class A Preferred  Stock and (ii) Knogo Common Stock
arise primarily from differences in the respective certificates of incorporation
and bylaws of Sentry and Knogo.  The Sentry  Certificate  of  Incorporation  and
Sentry Bylaws are substantially  similar to the Amended and Restated Certificate
of Incorporation and Bylaws, respectively,  of Knogo, except for certain matters
described below.

Authorized Capital and Par Value

         The total  number of  authorized  shares of  capital  stock of Knogo is
13,000,000  consisting of 10,000,000  shares of Knogo Common Stock and 3,000,000
shares of preferred  stock,  which  preferred stock may be issued in one or more
series  with such  designation,  relative  powers,  preferences,  and rights and
qualifications,  limitations, or restrictions, as the Knogo Board may determine.
The authorized capital stock of Sentry is described under "DESCRIPTION OF SENTRY
CAPITAL STOCK."

         The par value of the Knogo  Common  Stock is $0.01 per  share.  The par
value of each of the Sentry Common Stock and the Sentry Class A Preferred  Stock
is $0.001 per share.  The  principal  effect of this  change will be to somewhat
increase  the  amount  that  Sentry  will have  available  to pay  dividends  or
repurchase or redeem stock.  Except as set forth below and under "DESCRIPTION OF
SENTRY  CAPITAL  STOCK --  Preferred  Stock -- Class A  Preferred  Stock" and in
Sentry's Certificate of Incorporation, Sentry does not currently intend to adopt
dividend and stock repurchase policies different from those of Knogo.

Sentry Class A Preferred Stock

         As  described  above,  Knogo's  Amended  and  Restated  Certificate  of
Incorporation authorizes Knogo to issue blank check preferred stock; however, to
date,  no  series of  preferred  stock has been  issued by Knogo.  In  contrast,
Sentry,  which is also  authorized  to issue blank  check  preferred  stock,  is
designating  a series of preferred  stock,  the Sentry Class A Preferred  Stock,
which will be issued to holders of Knogo Common Stock as part of the Merger.

         The terms of the Sentry Class A Preferred Stock,  including the payment
of certain  dividends  thereon,  are set forth in the Certificate of Designation
with respect to such stock,  a copy of which,  in  substantially  the form to be
adopted   at  the   Effective   Time,   is   attached   to  this   Joint   Proxy
Statement/Prospectus as part of Appendix F, and is summarized under "DESCRIPTION
OF SENTRY CAPITAL STOCK -- Preferred Stock -- Class A Preferred Stock."


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<PAGE>

                       DESCRIPTION OF SENTRY CAPITAL STOCK

         The  summary of the terms of the stock of Sentry  set forth  below does
not purport to be complete  and is subject to and  qualified  in its entirety by
reference to the Sentry Certificate of Incorporation and the Sentry Bylaws.

Authorized Capital Stock

         Under the Sentry  Certificate  of  Incorporation,  the total  number of
shares of all classes of stock that Sentry has  authority to issue is 50,000,000
shares, of which 40,000,000 are shares of Sentry Common Stock and 10,000,000 are
shares of Sentry  Preferred  Stock.  Of the Sentry  Preferred  Stock,  6,000,000
shares have been designated  Sentry Class A Preferred Stock with a face value of
$5.00 per share.

Common Stock

         Holders of Sentry  Common  Stock will be entitled to one vote per share
on all matters voted on generally by the stockholders, including the election of
directors,  and, except as otherwise  required by law or except as provided with
respect to any series of Sentry Preferred Stock, the holders of such shares will
possess all voting  power.  The Sentry  Certificate  of  Incorporation  does not
provide for  cumulative  voting for the election of directors.  Thus,  under the
DGCL,  the  holders of more than  one-half of the  outstanding  shares of Sentry
Common Stock  generally  will be able to elect all the  directors of Sentry then
standing for election  and holders of the  remaining  shares will not be able to
elect any director.

         Subject to any  preferential  rights of any series of Sentry  Preferred
Stock,  holders of shares of Sentry  Common  Stock will be  entitled  to receive
dividends on such stock out of assets legally  available for distribution  when,
as and if  authorized  and declared by the Sentry Board and to share  ratably in
the assets of Sentry legally  available for  distribution to its stockholders in
the event of its liquidation, dissolution or winding up.

         Holders of Sentry  Common Stock will have no  preferences,  preemptive,
conversion or exchange rights.

   
         Under  certain  circumstances,  the  holders  of at  least  80%  of the
outstanding  voting stock of Sentry must approve (a) any merger or consolidation
with,  any  disposal  of a  substantial  part of the  assets  of  Sentry  or any
subsidiary to, or any issuance or sale by Sentry or a subsidiary of any stock of
Sentry or a subsidiary to, a beneficial  owner of 5% or more of the  outstanding
voting stock of Sentry,  unless such transaction is approved by the Sentry Board
and a majority of the  directors  so  approving  are  continuing  directors  (as
defined in the Sentry  Certificate  of  Incorporation),  (b) any  dissolution of
Sentry,  any offer by Sentry to purchase  its shares,  or any  reclassification,
recapitalization or other transaction designed to decrease the number of holders
of  shares  of  Sentry's  voting  stock,  if any  person  or  entity is then the
beneficial owner of 5% or more of the outstanding voting stock of Sentry, unless
such action is approved by the Sentry  Board and a majority of the  directors so
approving  are  continuing  directors,  (c) any change in the  provisions of the
Sentry  Certificate of  Incorporation or the Sentry Bylaws regarding the number,
classification,  term  of  office,  qualifications,   election  and  removal  of
directors and the filling of vacancies and newly created  directorships,  or the
provision  to the effect  that  stockholders  of Sentry  may not take  action by
written consent,  or any changes in the provisions of the Sentry  Certificate of
Incorporation  regarding  the  limitation  of  liability  of  directors  or  the
indemnification  of officers and  directors,  unless such change is submitted to
the stockholders  with the unanimous  recommendation of the entire Sentry Board,
or (d) any amendment to the foregoing supermajority voting requirements,  unless
such   amendment   is  submitted  to  the   stockholders   with  the   unanimous
recommendation of the entire Sentry Board.

         Certain  of the  foregoing  provisions  of the  Sentry  Certificate  of
Incorporation  may make more difficult,  and therefore  discourage,  attempts to
acquire control of Sentry through  acquisitions of shares of Sentry Common Stock
or otherwise,  in transactions  not approved by the Sentry Board. As a result of
these  provisions,  transactions or proposed  transactions  which might have the
short-term  effect of increasing  the market price of Sentry Common Stock may be
discouraged,  and  management of Sentry may be able to resist  changes which the
stockholders  might  otherwise  have the power to impose.  The  division  of the
Sentry Board into three classes could  discourage  third parties from seeking to
acquire  control of such Board and could impede proxy contests or other attempts
to change Sentry's management.
    



                                      114
<PAGE>

Preferred Stock

         The Sentry  Board is  authorized  to issue  shares of Sentry  Preferred
Stock, in one or more series or classes,  and to fix for each such series voting
powers and such  preferences  and  relative,  participating,  optional  or other
special  rights and such  qualifications,  limitations  or  restrictions  as are
permitted by the DGCL.  The Sentry Board could  authorize the issuance of shares
of Sentry  Preferred  Stock with terms and conditions  which could  discourage a
takeover or other  transaction  that  holders of some or a majority of shares of
Sentry Common Stock might believe to be in their best interests or in which such
holders  might  receive a premium for their shares of stock over the then market
price of such shares.

Class A Preferred Stock.

         The Sentry  Class A Preferred  Stock  shall,  with  respect to dividend
rights and rights on  liquidation,  winding  up or  dissolution,  rank on parity
with, or junior to, as the case may be, any other classes or series of Preferred
Stock established by the Sentry Board. Such other classes or series of Preferred
Stock shall specifically  provide that such class or series shall rank on parity
with, or senior to, the Sentry Class A Preferred  Stock with respect to dividend
rights and rights on liquidation,  winding up or dissolution.  Furthermore, such
Sentry Class A Preferred Stock shall,  except as described below,  rank prior to
any other equity securities of Sentry with respect to dividend rights and rights
on  liquidation,  winding up or  dissolution  (all of such equity  securities of
Sentry to which the Sentry Class A Preferred  Stock ranks prior,  including  the
Common  Stock,  are at times  collectively  referred  to herein  as the  "Junior
Stock").

   
         The annual  dividend rate on each share of the Sentry Class A Preferred
Stock  shall  be fixed  at five  percent  (5%) of the  Face  Value,  payable  as
described  below (the  "Dividend").  The holders of shares of the Sentry Class A
Preferred  Stock shall be entitled to receive  Dividends on the following  dates
(each, a "dividend payment date"): February 6, 1998 and 1999, August 6, 1999 and
2000, February 6, 2000 and 2001; the 12 month period ending on each of the first
two dividend payment dates is an "annual dividend  period," the six month period
ending  on each of the  next  four  dividend  payment  dates  is a  "semi-annual
dividend  period," and each such annual dividend period or semi-annual  dividend
period is a "dividend  period."  Dividends  (whether or not  declared)  shall be
payable in  additional  shares of the Sentry Class A Preferred  Stock during the
two annual  dividend  periods  ending on the first two  dividend  payment  dates
subsequent to issuance of the Sentry Class A Preferred Stock,  such that holders
shall receive a Dividend of 1/20th of a share of Sentry Class A Preferred  Stock
for each share of Sentry Class A Preferred Stock held.  Thereafter,  the holders
of shares of the Sentry Class A Preferred Stock shall be entitled to receive, in
preference  to  dividends on the Junior  Stock,  and whether or not declared the
Dividend  (including  any Dividend  accrued and unpaid)  payable in cash, out of
funds legally  available  for the payment of dividends,  such that holders shall
receive a Dividend  of $0.25 for each share of Sentry  Class A  Preferred  Stock
held, which Dividend shall accrue semi-annually and be due in equal installments
on each of the last four dividend  payment dates.  Each additional  share of the
Sentry Class A Preferred  Stock issued as a Dividend shall be valued at the Face
Value. All Dividends paid with respect to shares of the Sentry Class A Preferred
Stock pursuant to this paragraph shall be paid pro rata to the holders  entitled
thereto.
    

         Whenever,  at any  time or  times,  any  Dividend  payable  shall be in
arrears, the holders of the outstanding shares of Sentry Class A Preferred Stock
shall have the right,  voting  separately as a class,  to elect two directors of
Sentry no later than two years after such Dividend  shall be, and  continue,  in
arrears.  Upon the  vesting  of such  right of the  holders  of  Sentry  Class A
Preferred  Stock, the maximum  authorized  number of members of the Sentry Board
shall  automatically  be increased by two and the two vacancies so created shall
be filled by vote of the  holders of the  outstanding  shares of Sentry  Class A
Preferred  Stock.  The right of the holders of Sentry Class A Preferred Stock to
elect two members of the Sentry Board as  aforesaid  shall  continue  until such
time as all  Dividends  in arrears  shall have been paid in full,  at which time
such  right  shall  terminate,  except as herein or by law  expressly  provided,
subject to  revesting in the event of each and every  subsequent  default of the
character above described.

         If the Sentry Board  declares,  and Sentry pays or sets funds apart for
payment of, any dividend on any of the Junior  Stock,  the holders of the Sentry
Class A Preferred  Stock  shall share  equally,  share and share  alike,  in the
distribution  of any and all dividends  declared on such Junior Stock,  provided
that for this  purpose  each share of Sentry  Class A  Preferred  Stock shall be
treated as one share of such Junior Stock.


                                      115
<PAGE>

         Adjustment  of Hurdle  Price.  To  preserve  the  actual  or  potential
economic value of the Sentry Class A Preferred  Stock,  if at any time after the
date of the Sentry  Certificate of  Incorporation,  there shall be any change in
the Sentry Common  Stock,  whether by reason of stock  dividends,  stock splits,
recapitalizations,   mergers,  consolidations,   combinations  or  exchanges  of
securities,  split-ups,  split-offs,  spin-offs,   liquidations,  other  similar
changes  in  capitalization,  any  distribution  or  issuance  of cash,  assets,
evidences of indebtedness or subscription rights, options or warrants to holders
of Sentry Common Stock (other than regular cash  dividends) or otherwise,  then,
in each such event the Sentry Board shall make such  appropriate  adjustments in
the Hurdle Price (as defined below) such that following such  adjustments,  such
event shall not have had the effect of  increasing,  reducing  or  limiting  the
benefits the holders of shares of Sentry Class A Preferred  Stock would have had
absent such event.

         The "Deemed  Value"  equals the Face Value plus the amount by which the
Closing Price (as defined  below) exceeds the Hurdle Price (as defined below) on
the date of the relevant event. The "Hurdle Price" shall mean the amount that is
the average of the closing  prices for a share of Sentry  Common Stock on the 20
consecutive  trading  days ending on the trading date last  preceding  the first
anniversary of the Effective Time; provided, however, that in no event shall the
Hurdle  Price be less  than  $5.00 or more  than  $6.50,  such  that (x) if such
average amount is less than $5.00, the Hurdle Price shall equal $5.00 and (y) if
such average amount is more than $6.50,  the Hurdle Price shall equal $6.50. The
Hurdle Price is subject to certain  adjustments in the event of certain  changes
to the Sentry Common Stock to preserve the actual or potential economic value of
the Sentry Class A Preferred  Stock.  The "Closing  Price" equals the average of
the  closing  prices for a share of Sentry  Common  Stock on the 20  consecutive
trading  days ending on the trading date last  preceding an optional  redemption
date,  the  Mandatory  Redemption  Date  (as  defined  below),  the  date of any
liquidation,  dissolution  or winding up of the  affairs of Sentry,  the closing
date of an Acquisition (as defined below),  or the price per share of the Sentry
Common Stock issued in a Public Offering (as defined below), as the case may be,
as  reported  on NASDAQ,  or if such  closing  prices  shall not be  reported on
NASDAQ,  the average of the closing  prices,  regular  way,  for a share of such
security on the principal national securities exchange on which such security is
listed on such 20 consecutive trading days, or if such security is not listed on
any national  securities  exchange,  the average of the mean between the closing
bid and asked prices of a share of such security on such 20 consecutive  trading
days as reported,  or if such prices shall not be so reported, as the same shall
be reported by the  National  Quotation  Bureau,  Incorporated  or, in all other
cases, the value set in good faith by the Sentry Board.

         Liquidation  Preference.  In the event of any voluntary or  involuntary
liquidation,  dissolution or winding up of the affairs of Sentry, the holders of
shares of the Sentry Class A Preferred Stock then outstanding  shall be entitled
to be paid  out of the  assets  of  Sentry  available  for  distribution  to its
stockholders  an  amount  in cash for each  share  outstanding  equal to (i) the
Deemed Value, which as used herein shall equal the Face Value plus the amount by
which the Closing  Price  exceeds the Hurdle  Price on the date of the  relevant
event,  on the date of such an event  plus (ii) an  amount in cash  equal to all
accrued  but unpaid  Dividends  thereon,  plus  additional  dividends  on unpaid
Dividends accrued prior to the commencement of the then-current dividend period,
to the date  fixed for  liquidation,  before  any  payment  shall be made or any
assets  distributed to the holders of any of the Junior Stock.  If the assets of
Sentry are not sufficient to pay in full the liquidation payments payable to the
holders of  outstanding  shares of the Sentry  Class A  Preferred  Stock and any
other class or series of the Sentry Preferred Stock having liquidation rights on
parity with the shares of the Sentry Class A Preferred  Stock,  then the holders
of all such  shares  shall  share  ratably  in such  distribution  of  assets in
accordance  with the amount which would be payable on such  distribution  if the
amounts  to which  the  holders  of  outstanding  shares of the  Sentry  Class A
Preferred  Stock and the holders of  outstanding  shares of such other series of
the Sentry Preferred Stock are entitled were paid in full.

         The liquidation  payment with respect to each  fractional  share of the
Sentry Class A Preferred Stock outstanding,  if any, shall be equal to a ratably
proportionate amount of the liquidation payment with respect to each outstanding
share of the Sentry Class A Preferred Stock.

         Notwithstanding  any  other  provision  of the  Sentry  Certificate  of
Incorporation,  in  the  event  of any  voluntary  or  involuntary  liquidation,
dissolution or winding up of the affairs of Sentry,  the holders of Sentry Class
A Preferred  Stock  shall  receive the greater of (x) an amount in cash equal to
the  Deemed  Value on the date of the event  plus an amount in cash equal to all
accrued  but unpaid  Dividends  thereon,  plus  additional  dividends  on unpaid
Dividends accrued prior to commencement of the then-current  dividend period, to
the date fixed for liquidation, or (y) the amount which would be the liquidation
payment per share of Sentry  Common Stock if the Sentry Class A Preferred  Stock
were effectively redeemed for Sentry Common Stock prior to such liquidation, for
which  purpose  the  Sentry  Class  A  Preferred   Stock  shall  be  treated  as
representing an equal number of shares of Sentry Common Stock.


                                      116
<PAGE>

Redemption.

         Optional  Redemption.  Prior to the  first  anniversary  of the date of
issuance of the Sentry  Class A  Preferred  Stock,  Sentry  shall not redeem the
Sentry  Class A  Preferred  Stock.  Subject to the  preceding  sentence  and the
mandatory  redemption  provisions in the Sentry  Certificate  of  Incorporation,
Sentry may, at its option, redeem the Sentry Class A Preferred Stock for cash at
any time in  whole  at the  Deemed  Value,  together  with  accrued  and  unpaid
Dividends,  if any,  thereon.  If Sentry completes a Public Offering (as defined
below) or an  Acquisition  (as  defined  below)  more than 35 days  prior to the
Mandatory  Redemption Date (as defined  below),  then Sentry may, at its option,
redeem the Sentry Class A Preferred  Stock for Sentry Common Stock at the Deemed
Value.

         "Public  Offering"  means an  underwritten  public  offering  of Sentry
Common Stock with net  proceeds  resulting  therefrom in excess of  $12,000,000.
"Acquisition" means an acquisition by Sentry of property of or securities issued
by a third  party in which the  consideration  paid by Sentry (i)  consists,  in
whole or in part, of shares of Sentry Common Stock and (ii) the aggregate  value
of such shares of Sentry  Common Stock exceeds  $12,000,000;  provided that such
aggregate  value shall be based upon the number of such shares of Sentry  Common
Stock  multiplied  by  the  Closing  Price  as  of  the  closing  date  of  such
Acquisition.

         Mandatory Redemption. On the fourth anniversary of the date of issuance
of the Sentry Class A Preferred Stock (the "Mandatory Redemption Date"), so long
as any shares of the Sentry Class A Preferred Stock shall be outstanding, Sentry
shall redeem any issued and  outstanding  Sentry Class A Preferred  Stock at the
Deemed Value,  together with accrued and unpaid Dividends,  if any, thereon, for
cash (to the extent Sentry shall have funds legally  available for such payment)
or Sentry  Common  Stock,  at Sentry's  option.  The price of such Sentry Common
Stock shall be its Closing Price.

         Acquired  Shares.  Shares of the Sentry  Class A Preferred  Stock which
have been issued and  reacquired in any manner,  including  shares  purchased or
redeemed,  shall (upon compliance with any applicable  provisions of the laws of
the State of Delaware)  have the status of  authorized  and  unissued  shares of
Preferred Stock  undesignated as to class or series and may be redesignated  and
reissued  as part of any  class or  series  of the  Preferred  Stock;  provided,
however,  that no such  issued  and  reacquired  shares  of the  Sentry  Class A
Preferred Stock shall be reissued or sold as Sentry Class A Preferred Stock.

         Conversion to Notes. To the extent that funds are not legally available
on the  Mandatory  Redemption  Date for the  payment  in cash for the  mandatory
redemption  of the Sentry  Class A  Preferred  Stock,  and Sentry does not issue
Sentry Common Stock as payment for such mandatory redemption, as required in the
Sentry  Certificate of  Incorporation,  each outstanding share of Sentry Class A
Preferred  Stock  shall   automatically   convert  (the   "Conversion")  into  a
subordinated note (the  "Subordinated  Note") given by Sentry for the benefit of
the holder thereof.  Each Subordinated Note shall be in a principal amount equal
to the Deemed Value plus accrued and unpaid  Dividends.  The Subordinated  Notes
(i) shall bear  interest  at a rate of six  percent  (6%) per annum,  (ii) shall
mature  at the end of one year  from  the date of  Conversion,  and  (iii)  upon
maturity,  shall  become due and  payable as to any  outstanding  principal  and
interest.

         At the time of the Conversion,  the holders of the  Subordinated  Notes
shall have the right,  voting  separately  as a class,  to elect one director of
Sentry. Upon the vesting of such right of the holders of the Subordinated Notes,
the maximum authorized number of members of the Sentry Board shall automatically
be increased  by one, and the one vacancy so created  shall be filled by vote of
the  holders  of  the  Subordinated  Notes.  The  right  of the  holders  of the
Subordinated  Notes to elect a member of the  Sentry  Board as  aforesaid  shall
continue  until such time as the  Subordinated  Notes have been paid in full, at
which  time such right  shall  terminate,  except as herein or by law  expressly
provided.

         Voting  Rights.  The holders of record of shares of the Sentry  Class A
Preferred Stock shall not be entitled to any voting rights except as provided by
law  or  otherwise   specifically   provided  in  the  Sentry   Certificate   of
Incorporation.

         Consent.  No consent of holders of the Sentry  Class A Preferred  Stock
shall  be  required  for (a) the  creation  of any  indebtedness  of any kind of
Sentry,  (b) the creation of any class of stock of Sentry  ranking  junior as to
dividends and upon liquidation to the Sentry Class A Preferred Stock, or (c) any
increase or decrease in the amount of authorized  Common  Stock.  The consent of
the holders of two-thirds of the outstanding shares of the Sentry Class


                                      117
<PAGE>

A Preferred  Stock shall be required  for the creation of any class of preferred
stock ranking  senior in preference to the Sentry Class A Preferred  Stock.  The
consent of the  holders of a majority  of the  outstanding  shares of the Sentry
Class A  Preferred  Stock  shall be  required  for the  creation of any class of
preferred  stock  ranking  equal in  preference  to the Sentry Class A Preferred
Stock.

         Amendments. The Sentry Board reserves the right by subsequent amendment
of the Sentry  Certificate of  Incorporation  from  time-to-time to decrease the
number of shares which  constitute  the Sentry Class A Preferred  Stock (but not
below the number of shares thereof then outstanding and required for the payment
of Dividends).

   
Certain Charter and By-Law Provisions

Classified Board of Directors

         The Sentry  Certificate of Incorporation  provides for the Sentry Board
to be divided  into three  classes of  Directors  serving  staggered  three-year
terms. As a result,  approximately one-third of the Sentry Board will be elected
each year.

         This provision could prevent a party who acquires control of a majority
of the outstanding voting stock from obtaining control of the Sentry Board until
the second annual stockholders'  meeting following the date the acquiror obtains
the controlling stock interest, and thus could have the effect of discouraging a
potential acquiror from making a tender offer or otherwise  attempting to obtain
control of Sentry.  Accordingly,  this  provision  could increase the likelihood
that incumbent Sentry Directors will retain their positions.

Number of Directors; Removal; Vacancies

         The Sentry  Certificate  of  Incorporation  provides that the number of
Directors shall be determined from time to time by majority of the Sentry Board,
provided  that in no event  shall  such  number be less than  three.  The Sentry
Bylaws  provide  that the Sentry  Board  shall have the right to fill  vacancies
including vacancies created by expansion of the Sentry Board.

         The Sentry  Certificate of  Incorporation  further provides that Sentry
Directors  may be removed only for cause and then only at any annual  meeting or
special meeting of the stockholders, the notice of which states that the removal
of a Director or Directors is among the purposes of the meeting, and only by the
affirmative  vote of the  holders  of at least 80% of the voting  stock,  voting
together as a single class. This provision, in conjunction with the provision of
the Sentry  Bylaws  authorizing  the Sentry Board to fill vacant  directorships,
would prevent  stockholders  from removing  incumbent Sentry  Directors  without
cause and filling the resulting vacancies with their own nominees.

Stockholder Action by Unanimous Consent; Special Meetings

         The  Sentry  Certificate  of  Incorporation  provides  that any  action
required or permitted to be taken by the stockholders of Sentry must be effected
at a duly called annual or special meeting of stockholders of Sentry and may not
be effected by any consent in writing of such stockholders.  Special meetings of
stockholders  of Sentry may be called  only by the  Chairman of the Board or the
Secretary of Sentry within 10 calendar days after receipt of the written request
of a majority of the total number of Directors  which Sentry would have if there
were no vacancies.  At an annual meeting or special  meeting of  stockholders of
Sentry,  only such  business will be conducted or considered as has been brought
before such meeting in the manner provided in the Sentry Bylaws.

Advance Notice for Raising Business or Making Nominations at Meetings

         The Sentry Bylaws  establish an advance  notice  procedure for business
being  brought  before  an  annual  meeting  of  stockholders  of  Sentry by the
stockholders  and for nominations by the stockholders of candidates for election
as Sentry  Directors at an annual  meeting or a special  meeting  called for the
purpose of  electing  such  Directors.  Subject to  applicable  law,  including,
without limitation, Rule 14a-8 under the Exchange Act, only such business may be
conducted at an annual  meeting as has been brought before the meeting by, or at
the  direction of, the Sentry  Board,  or by a stockholder  who has given to the
Secretary of Sentry timely written notice,  in proper form, of the stockholder's
intention to bring that business before the meeting.  In addition,  only persons
who are


                                      118
<PAGE>

nominated by, or at the direction of the Sentry Board, or who are nominated by a
stockholder  who has  given  timely  written  notice,  in  proper  form,  to the
Secretary  of Sentry  prior to a meeting  at which  Sentry  Directors  are to be
elected will be eligible for election as Directors of Sentry.

         To be timely,  notice of  nominations  or other  business to be brought
before an annual  meeting  must be received by the  Secretary of Sentry not less
than 60 nor more than 90 days prior to the meeting;  however, if the date of the
meeting is first publicly  announced or disclosed less than 75 days prior to the
date of the meeting, notice shall be given not more than 10 days after such date
is first  announced  or  disclosed.  Similar  advance  notice  requirements  are
applicable to nominations to be brought before a special  meeting called for the
purpose of electing Directors.

Amendment of Certain Charter and By-Laws Provisions

         The Sentry Certificate of Incorporation  provides that the Sentry Board
may adopt,  amend, or repeal any provision of the Sentry Bylaws.  Any Bylaw made
by the Sentry  Board may be amended or  repealed  by the Sentry  Board or by the
stockholders  in the manner provided in the Sentry Bylaws.  Notwithstanding  the
foregoing,  certain  Sentry  Bylaws  may  not  be  amended  or  repealed  by the
stockholders,  and no  provision  inconsistent  therewith  may be adopted by the
stockholders, without the affirmative vote of the holders of at least 80% of the
voting  stock,  voting  together  as a single  class.  The Sentry  Bylaws may be
amended or repealed at any time, either at any meeting of stockholders, provided
that any amendment or  supplement  proposed to be acted upon at any such meeting
has been  described  or  referred  to in the notice of such  meeting,  or at any
meeting of the Sentry Board,  provided  that no amendment  adopted by the Sentry
Board may vary or conflict with any amendment adopted by the stockholders.
    


Transfer Agent and Registrar

         The principal  transfer agent and registrar for Sentry Common Stock and
Sentry Class A Preferred Stock will be American Stock Transfer Company.

                                      119
<PAGE>

                                  LEGAL MATTERS

         The  validity of the Sentry  Common  Stock and Sentry Class A Preferred
Stock to be issued in  connection  with the Merger  will be passed upon by Dewey
Ballantine.

         Dewey  Ballantine,  counsel  for Video,  and Stroock & Stroock & Lavan,
counsel for Knogo, have delivered opinions concerning certain Federal income tax
consequences of the Merger.

                                     EXPERTS

         The financial  statements  of Video at December 31, 1994 and 1995,  and
for each of the three years in the period ended  December 31, 1995,  included in
this Joint Proxy  Statement/Prospectus,  which is referred to and made a part of
this Registration Statement, have been audited by Ernst & Young LLP, independent
auditors,  as set forth in their  report  appearing  elsewhere  herein,  and are
included in reliance  upon such report given upon the  authority of such firm as
experts in accounting and auditing.

         The consolidated  financial statements of Knogo as of December 31, 1994
and 1995 and for the year ended  February 28, 1994, the 10 months ended December
31,  1994 and the year ended  December  31,  1995  included  in this Joint Proxy
Statement/Prospectus  and the  related  financial  statement  schedule  included
elsewhere in the Registration Statement,  have been audited by Deloitte & Touche
LLP,  independent  auditors,  as stated in their  reports  appearing  herein and
elsewhere in the  Registration  Statement (which report expresses an unqualified
opinion and includes an explanatory paragraph referring to Knogo's and the Knogo
Predecessor's   consummation   of  Merger  and   Divestiture   Agreements   with
Sensormatic),  and have been so included  in  reliance  upon the reports of such
firm given upon their authority as experts in accounting and auditing.

                          FUTURE STOCKHOLDER PROPOSALS

   
         If the Merger is  consummated,  the first annual  meeting of the public
stockholders  of Sentry  after such  consummation  is expected to be held in May
1998.  If  the  Merger  is not  consummated,  the  1997  annual  meeting  of the
shareholders  of Video is expected to be held on or about June 1997 and the 1997
annual meeting of the  stockholders  of Knogo is expected to be held on or about
May 1997.

         Subject to the foregoing,  if any Sentry stockholder intends to present
a proposal at the 1998 Sentry  annual  meeting and wishes to have such  proposal
considered  for inclusion in the proxy  materials for such meeting,  such holder
must  submit  the  proposal  to the  Secretary  of Sentry in writing so as to be
received at the executive  offices of Sentry by January 15, 1998. Such proposals
must also meet the other requirements of the rules of the Commission relating to
stockholders'  proposals.  In the event the Merger is not consummated,  the only
stockholder  proposals  eligible to be  considered  for  inclusion  in the proxy
materials  for the 1997  annual  meetings of Video and Knogo will be those which
have been duly  submitted  to the  Secretary of Video by February 1, 1997 or the
Secretary  of Knogo by December 5, 1996,  as the case may be, as provided in the
respective  1996  Annual  Meeting  Proxy  Statements  of Video and Knogo.  To be
properly  presented at the 1998 Sentry annual meeting,  a proposal must meet the
procedural  and other  requirements  set  forth in the  Bylaws  of  Sentry.  See
Appendix G to this Joint Proxy Statement/Prospectus.
    



                                      120


<PAGE>



                            Video Sentry Corporation

                              Financial Statements







                                    Contents

Report of Independent Auditors...............................................F-2

Audited Financial Statements

Balance Sheets...............................................................F-3
Statements of Operations.....................................................F-4
Statement of Changes in Shareholders' Equity.................................F-5
Statements of Cash Flows.....................................................F-6
Notes to Financial Statements................................................F-7







                                       F-1

<PAGE>











                         Report of Independent Auditors


Board of Directors and Shareholders
Video Sentry Corporation
Eden Prairie, Minnesota


We have audited the accompanying  balance sheets of Video Sentry  Corporation as
of December 31, 1994 and 1995, and the related statements of operations, changes
in shareholders' equity and cash flows for each of the three years in the period
ended December 31, 1995. These financial  statements are the  responsibility  of
the Company's  management.  Our responsibility is to express an opinion on these
financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  the financial  statements  referred to above present fairly, in
all material  respects,  the financial  position of Video Sentry  Corporation at
December 31, 1994 and 1995, and the results of its operations and its cash flows
for each of the three years in the period ended December 31, 1995, in conformity
with generally accepted accounting principles.

                                                 ERNST & YOUNG LLP


Eden Prairie,  Minnesota
February 27, 1996,  except for Note 12
as to which the date is March 26, 1996







                                       F-2

<PAGE>


<TABLE>

                                                 Video Sentry Corporation

                                                      Balance Sheets
<CAPTION>

                                                                              December 31,
                                                             ----------------------------------------------            September 30,
                                                                     1994                     1995                         1996
                                                             ---------------------   ----------------------            -------------
                                                                                                                        (Unaudited)
<S>                                                                   <C>                     <C>                      <C>

Assets
Current assets:
   Cash and cash equivalents                                          $2,902,536              $   221,606              $    99,002
   Investments                                                           799,851                      --                       --
   Accounts receivable:
      Trade                                                            1,656,464                2,555,490                1,540,468
      Officer                                                             29,418                   40,449                      --
   Inventories                                                           629,267                2,552,706                2,399,035
   Prepaid insurance and deposits                                        117,940                  106,775                  110,161
                                                                    ------------             ------------              -----------
Total current assets                                                   6,135,476                5,477,026                4,148,666
Property and equipment:
   Office furniture and equipment                                        184,597                  553,399                  554,300
   Production equipment                                                   42,629                   97,441                  116,261
                                                                    ------------             ------------              -----------
                                                                         227,226                  650,840                  670,561
   Less accumulated depreciation                                          45,962                  164,360                  300,259
                                                                    ------------             ------------              -----------
                                                                         181,264                  486,480                  370,302
Patent and organizational costs (less
   amortization of: 1994--$16,928, 1995--$25,328
   and 1996--$30,552)                                                     25,082                   16,682                   11,458
Software costs                                                              --                    635,223                  720,790
                                                                   -------------             ------------             ------------
                                                                          25,082                  651,905                  732,248
                                                                   -------------             ------------             ------------
Total assets                                                        $  6,341,822             $  6,615,411              $ 5,251,216
                                                                   =============             ============             ============

Liabilities and shareholders' equity 
Current liabilities:
   Accounts payable                                                  $   674,139              $ 2,223,969              $ 1,659,538
   Notes payable                                                             --                       --                 2,110,180
   Customer deposits                                                      97,497                   28,013                   14,000
   Accrued liabilities                                                   200,913                  464,905                  323,658
                                                                   -------------             ------------             ------------
Total current liabilities                                                972,549                2,716,887                4,107,286

Rental abatement                                                          20,515                   22,028                   16,163

Shareholders' equity:
   Common stock, $.01 par value:
      Authorized shares -- 10,000,000;
      Issued and outstanding shares --
         1994--4,552,684, 1995--4,727,184,
         1996--4,841,962                                                  45,527                   47,272                   48,420
   Additional paid-in capital                                          7,370,411                7,577,361                7,862,934
   Accumulated deficit                                                (2,067,180)              (3,748,137)              (6,783,587)
                                                                   -------------             ------------             ------------
Total shareholders' equity                                             5,348,758                3,876,496                1,127,767
                                                                   -------------             ------------             ------------
Total liabilities and shareholders' equity                           $ 6,341,822              $ 6,615,411              $ 5,251,216
                                                                   =============             ============             ============




<FN>

See accompanying notes.
</FN>
</TABLE>





                                       F-3

<PAGE>

<TABLE>


                                                      Video Sentry Corporation

                                                      Statements of Operations


<CAPTION>
                                                                                                             Nine Months Ended
                                                              Year ended December 31,                          September 30,
                                               --------------------------------------------------      -----------------------------
                                                   1993                1994               1995             1995              1996
                                               -----------         -----------        -----------       ----------       -----------
<S>                                            <C>                  <C>               <C>               <C>             <C>
                                                                                                              (Unaudited)

Sales                                          $   743,734          $4,241,096        $ 8,610,316       $7,768,362      $ 2,000,382
Cost of sales                                      563,760           3,440,056          7,342,784        5,899,273        3,085,708
                                               -----------         -----------        -----------       ----------      -----------
Gross margin                                       179,974             801,040          1,267,532        1,869,089       (1,085,326)

Operating expenses:
   Research, development and
   engineering                                     203,693             351,892            606,882          467,151          320,514
   Selling and marketing                           353,241             370,650            855,206          546,610          543,537
   General and administrative                      490,941             826,002          1,262,370          938,173        1,002,918
   Offering costs and officer severance               --                  --              321,646             --               --
                                               -----------         -----------        -----------       ----------      -----------
Total operating expenses                         1,047,875           1,548,544          3,046,104        1,951,934        1,866,969
                                               -----------         -----------       ------------      -----------      -----------
Operating loss                                    (867,901)           (747,504)        (1,778,572)         (82,845)      (2,952,295)

Other income (expense):
   Interest expense                                (48,399)           (132,966)            (1,859)          (1,757)         (83,259)
   Interest income                                    --                33,511             99,474           96,967              104
                                               -----------         -----------        -----------       ----------      -----------
                                                   (48,399)            (99,455)            97,615           95,210          (83,155)
                                               -----------         -----------        -----------       ----------      -----------
Net income (loss)                             $   (916,300)        $  (846,959)       $(1,680,957)     $    12,365      $(3,035,450)
                                              ============         ===========        ===========      ===========      ===========

Net income (loss) per share                   $      (0.38)        $     (0.31)       $     (0.36)     $      0.00      $     (0.63)
                                              ============         ===========        ===========      ===========      ===========

Weighted average number of shares
   outstanding                                   2,387,823           2,747,609          4,673,759        5,207,965        4,808,529
                                              ============         ===========        ===========      ===========      ===========



<FN>

See accompanying notes.
</FN>
</TABLE>







                                       F-4

<PAGE>


<TABLE>

                            Video Sentry Corporation

                  Statement of Changes in Shareholders' Equity

<CAPTION>


                                                   Common Stock                Additional
                                          ---------------------------           Paid-In            Accumulated
                                          Shares              Amount            Capital              Deficit               Total
                                         ---------          ---------       -------------          ------------        ------------
<S>                                      <C>                  <C>             <C>                 <C>                 <C>


Balance January 1, 1993                  2,222,884            $22,229         $   158,286         $   (303,921)       $   (123,406)
   Stock options exercised                  64,800                648              65,448                  --               66,096
   Options and warrants
      issued for services                     --                 --                14,163                  --               14,163
   Net loss                                   --                 --                  --               (916,300)           (916,300)
                                        ----------          ---------       -------------         ------------        ------------
Balance December 31, 1993                2,287,684             22,877             237,897           (1,220,221)           (959,447)
   Options and warrants
      issued for services                     --                 --                16,950                 --                16,950
   Stock options exercised                  71,250                712              91,100                 --                91,812
   Stock warrants exercised                 49,000                490             164,885                 --               165,375
   Initial public offering of
      common stock--net of
      expenses of $1,161,837             2,144,750             21,448           6,859,579                 --             6,881,027
   Net loss                                   --                 --                  --               (846,959)           (846,959)
                                        ----------          ---------       -------------         ------------        ------------
Balance December 31, 1994                4,552,684             45,527           7,370,411           (2,067,180)          5,348,758
   Stock options exercised                 129,500              1,295             156,550                 --               157,845
   Stock warrants exercised                 45,000                450              50,400                 --                50,850
   Net loss                                   --                 --                  --             (1,680,957)         (1,680,957)
                                        ----------          ---------       -------------         ------------        ------------
Balance December 31, 1995                4,727,184             47,272           7,577,361           (3,748,137)          3,876,496
   Stock options exercised                 114,778              1,148             285,573                  --              286,721
   Net loss                                   --                 --                  --             (3,035,450)         (3,035,450)
                                        ----------          ---------       -------------         ------------        ------------
Balance September 30, 1996
   (unaudited)                           4,841,962            $48,420          $7,862,934          $(6,783,587)         $1,127,767
                                        ==========          =========       =============         ============        ============





<FN>

See accompanying notes.
</FN>

</TABLE>





                                       F-5

<PAGE>

<TABLE>


                            Video Sentry Corporation

                            Statements of Cash Flows
<CAPTION>


                                                                                                             Nine Months Ended
                                                                     Year ended December 31,                   September 30,
                                               -----------------------------------------------------   -----------------------------
                                                    1993               1994             1995              1995             1996
                                               -------------       ------------      -------------   --------------   -------------
<S>                                              <C>            <C>                 <C>              <C>               <C>

                                                                                                                (Unaudited)
Operating activities:
Net income (loss)                                $(916,300)     $   (846,959)       $(1,680,957)     $    12,365       $(3,035,450)
Adjustments to reconcile net income
   (loss) to net cash used in operating
   activities:
   Depreciation and amortization                    18,160            35,598            126,798           81,569           141,124
   Stock options and warrants issued for
     services                                       14,163            16,950               --                --                --
   Rental abatement                                   --                --                1,513            2,269            (5,865)
Changes in operating assets and liabilities:
   Accounts receivable                             (26,964)       (1,658,768)          (910,057)      (1,662,610)        1,055,470
   Inventories and prepaids                       (230,102)         (392,418)        (1,912,274)      (1,276,290)          150,286
   Accounts payable and accrued
     liabilities                                   151,563           431,489          1,813,822        1,089,828          (705,769)
   Customer deposits                               449,659          (387,217)           (69,484)         (92,997)          (14,013)
                                                ----------      ------------       ------------     ------------      ------------
Net cash used in operating activities             (539,821)       (2,801,325)        (2,630,639)      (1,845,866)       (2,414,217)

Investing activities:
   Purchase of property and equipment              (27,741)         (143,726)          (423,614)        (345,820)          (19,721)
   Purchase of investments                            --            (799,851)          (875,149)      (1,317,032)              --
   Maturity of investments                            --                --            1,675,000        2,116,883               --
   Purchased software costs                           --                --             (635,223)        (590,520)          (85,567)
   Patent costs                                     (7,915)          (10,855)               --               --                --
                                                ----------      ------------       ------------     ------------      ------------
Net cash used in investing activities              (35,656)         (954,432)          (258,986)        (136,489)         (105,288)

Financing activities:
   Net borrowings from (repayment of)
     notes payable                                 432,096          (487,096)              --               --           2,110,180
   Proceeds from issuance of unsecured
     notes payable                                    --           1,560,000               --               --                 --
   Repayment of notes payable                         --          (1,575,000)              --               --                 --
   Net proceeds from issuance of common
     stock                                          66,096         6,881,027               --               --                 --
   Proceeds from exercise of options
     and warrants                                     --             257,187            208,695          208,695           286,721
                                                ----------      ------------       ------------     ------------      ------------
Net cash provided by financing activities          498,192         6,636,118            208,695          208,695         2,396,901
                                                ----------      ------------       ------------     ------------      ------------
Net (decrease) increase in cash                    (77,285)        2,880,361         (2,680,930)      (1,773,660)         (122,604)
Cash and cash equivalents at beginning of
   year                                             99,460            22,175          2,902,536        2,902,536           221,606
                                                ----------      ------------       ------------     ------------      ------------
Cash and cash equivalents at end of year        $   22,175       $ 2,902,536       $    221,606      $ 1,128,876      $     99,002
                                                ==========      ============       ============      ===========      ============


<FN>

See accompanying notes.
</FN>

</TABLE>




                                       F-6

<PAGE>


                            Video Sentry Corporation

                          Notes to Financial Statements

                                December 31, 1995



                  (Unaudited with respect to September 30, 1996
          and the nine month periods ended September 30, 1995 and 1996)



1. Summary of Significant Accounting Policies

Nature of Business

Video Sentry Corporation (the "Company"), incorporated in Minnesota on September
10, 1990,  is engaged in the design,  development  and  marketing of a traveling
closed circuit  television  ("CCTV")  security  surveillance  system  ("system")
throughout the United States.

Revenue and Cost Recognition

The Company recognizes revenue for its systems at the time of shipment.  Revenue
for  installation is recorded when the system is installed and is netted against
the costs of installation included in cost of sales.

Cash Equivalents

The Company considers all highly liquid investments (U.S. Government securities)
with a maturity date of 90 days or less to be cash equivalents. Cash equivalents
are stated at cost which approximates fair market value.

Investments

Investments consist of U.S.  government  securities with maturities of less than
one year and are stated at cost which approximates fair market value.

Allowance for Uncollectible Accounts

The  Company  provides  a  specific  reserve  for  uncollectible  accounts  when
collection of an account becomes doubtful. No reserve was deemed necessary as of
December 31, 1995 or 1994.

Inventories

Inventories are stated at the lower of cost (first-in,  first-out) or market and
consist primarily of purchased parts and components.

Property and Equipment

Property and equipment are stated at cost.  Depreciation  is computed  using the
straight-line  method over the estimated  useful lives of the assets which range
from two to seven years.






                                       F-7

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)




1. Summary of Significant Accounting Policies (continued)

Other Assets

Patent costs and  organizational  costs are  amortized  over 60 months using the
straight-line method.

Software Costs

The Company  capitalizes  software costs  purchased from outside parties for its
point-of-sale   product.   The  Company  will  amortize   software  costs  on  a
straight-line  basis  over a  maximum  of three  years  or based on units  sold,
whichever  is  shorter.  Amortization  will begin when the  software  product is
tested and complete.

Income Taxes

Income taxes will be provided using the liability method.  Deferred income taxes
will be provided for temporary  differences  between financial reporting and tax
bases of assets and liabilities.

Warranty

The  Company's  warranty  policy  generally  provides for  one-year  coverage on
defective  equipment.  Estimated  warranty  costs are recorded when revenues are
recognized.

Use of Estimates

The preparation of financial  statements in conformity  with generally  accepted
accounting principles requires management to make estimates and assumptions that
affect the amounts reported in the financial  statements and accompanying notes.
Actual results could differ from those estimates.

Stock-Based Compensation

The Company follows  Accounting  Principles Board Opinion No. 25, Accounting for
Stock Issued to Employees (APB 25) and related interpretations in accounting for
its stock options. Under APB 25, when the exercise price of stock options equals
the  market  price  of the  underlying  stock  on the  date  of  the  grant,  no
compensation expense is recognized.

In October 1995, the Financial  Accounting  Standards Board issued  Statement of
Financial   Accounting   Standards   No.  123,   "Accounting   for   Stock-Based
Compensation." The Company has not determined the impact of the new statement on
its financial statements.

Impairment of Long-Lived Assets

The  Company  will  record  impairment  losses  on  long-lived  assets  used  in
operations when indicators of impairment are present and the  undiscounted  cash
flows  estimated  to be  generated  by those  assets  are less than the  assets'
carrying amount.






                                       F-8

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)




Net Loss Per Share

Net loss per share is  computed  using  the  weighted  average  number of common
shares and common share equivalents, if dilutive, outstanding during the periods
presented.  For periods prior to October 1994 (the initial public offering), the
net loss per share  amounts give effect to the  application  of  Securities  and
Exchange  Commission Staff  Accounting  Bulletin ("SAB") No. 83. Pursuant to SAB
No. 83, the common stock equivalent  shares granted at exercise prices less than
the initial public offering price during the twelve months immediately preceding
the initial public  offering have been included in the  determination  of shares
used in the  calculation of net loss per share as if they were  outstanding  for
all periods up to the initial public offering date.

Interim Financial Information

The financial  statements for the nine months ended  September 30, 1995 and 1996
have been prepared by the Company  pursuant to the rules and  regulations of the
Securities and Exchange  Commission.  These statements are unaudited but, in the
opinion of management,  include all adjustments  (consisting of normal recurring
adjustments  and accruals)  necessary for a fair  presentation  of the financial
information set forth herein.

2. Notes Payable

In March 1994,  the Company  issued  $1,560,000 of 10%  unsecured  notes payable
which were due in March 1995 or upon the closing of an initial  public  offering
of the Company's  Common Stock.  The unsecured notes were repaid in October 1994
from the proceeds of the Company's initial public offering of Common Stock.

Interest paid was $37,535, $145,142, $1,859, $1,757 and $72,443 during the years
ended December 31, 1993, 1994, 1995 and the nine months ended September 30, 1995
and 1996, respectively.

3. Customer Deposits

In 1993, the Company  entered into a contract for the sale and  installation  of
its system in twelve retail stores.  As part of the contract,  the purchaser was
required to pay a deposit of $440,000.  During 1994,  one-twelfth of the deposit
was applied to the  purchase  price of each store's  system when  billed.  As of
December 31, 1994,  ten stores had been billed and as of December 31, 1995,  all
stores had been billed and no deposit remained on this purchase order.

4. Income Taxes

At December 31, 1995 and September 30, 1996,  the Company had net operating loss
carryforwards of approximately  $3,400,000 and $6,300,000,  respectively,  which
are  available to offset  future  taxable  income and expire in varying  amounts
through 2010.  These  carryforwards  are subject to the  limitations of Internal
Revenue  Code  section  382.  This  section  provides  that  limitations  on the
availability  of net operating  losses to offset  current  taxable income result
when an ownership change has occurred for federal tax purposes.







                                       F-9

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)



<TABLE>

4. Income Taxes (continued)


Deferred income taxes reflect the effects of temporary  differences  between the
carrying amounts of assets and liabilities for financial  reporting purposes and
amounts used for income tax purposes.  The components of the Company's  deferred
taxes are as follows:

<CAPTION>

                                                              December 31,                   September 30,
                                                        1994               1995                  1996
                                                      ---------        ------------           -----------
<S>                                                   <C>               <C>                   <C>

   Deferred tax assets:
     Net operating loss carryforwards                 $ 570,000        $  1,100,000           $ 2,048,000
     Warranty reserve                                    44,000              19,000                61,000
     Other                                               17,000              41,000                76,000
                                                      ---------        ------------           -----------
                                                        631,000           1,160,000             2,185,000

   Deferred tax liabilities:
     Other                                              (16,000)            (13,000)              (25,000)
                                                      ---------        ------------           -----------
   Net deferred tax assets before valuation
     allowance                                          615,000           1,147,000             2,160,000
   Less valuation allowance                            (615,000)         (1,147,000)           (2,160,000)
                                                      ---------        ------------           -----------
   Net deferred tax assets                            $   --           $     --               $     --
                                                      =========        ============           ===========


</TABLE>

The valuation  allowance was provided as the  recoverability of the deferred tax
assets is dependent on future taxable income.

5. Lease Commitments

The Company  leases its office and  manufacturing  facility  under a lease which
runs through March 31, 1999.  The Company is recognizing  the benefit  ofcertain
abatements  made by the landlord  over the life of the lease on a  straight-line
basis.

The Company  also leases  automobiles,  trucks and  warehouse  facilities  under
operating  lease  agreements with an initial term of more than one year at their
inception.

Future minimum annual lease payments for all of the above leases are as follows:

   Year ending December 31:
       1996                                     $124,000
       1997                                      106,000
       1998                                       89,000
       1999                                       19,000
                                                --------
                                                $338,000
                                                ========







                                      F-10

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)




Total  expense for the  operating  leases,  including  operating  expenses,  was
approximately $30,000,  $90,000,  $168,000,  $131,000 and $123,000 for the years
ended December 31, 1993,  1994 and 1995 and the nine months ended  September 30,
1995 and 1996, respectively.

6. Common Stock

Stock Split

In March 1994, the Company's Board of Directors authorized a three-for-two stock
split  effected in the form of a stock  dividend.  Accordingly,  all share,  per
share, and stock option and warrant information has been retroactively  adjusted
to reflect the stock split.

Change in Authorized Shares

In March 1994, the Company's shareholders approved an increase in the authorized
shares of Class A Common Stock to 10,000,000 shares.

Prior to June 30,  1994,  the  Company  was  authorized  to issue Class A common
stock,  which was voting stock,  and Class B common stock,  which was non-voting
stock. On June 30, 1994, the Company's  shareholders approved the elimination of
the  Class A and  Class B Common  Stock and  authorized  10,000,000  shares of a
single  class of Common  Stock,  $.01 par value.  All issued Class A and Class B
Common  Stock  were  converted  to  the  new  single-class  common  stock  on  a
one-for-one basis.

Initial Public Offering

In October and November 1994, the Company sold 2,144,750  shares of Common Stock
at $3.75 per share in an initial public offering of Common Stock.

Stock Options

The Company has a stock option plan for key  employees,  directors,  consultants
and  independent  contractors.  The exercise  price for incentive  stock options
granted  may not be less than the fair value of the shares on the date of grant,
except for 10%  shareholders,  in which case the exercise  price may not be less
than 110% of the fair market value. For non-qualified stock options the exercise
price  may not be less than 85% of the fair  market  value on the date of grant.
The term for  options  granted  under the plan may not  exceed 10 years from the
date of grant,  or five years in the case of incentive  stock options granted to
10% shareholders.

The  Company  has also  granted  non-qualified  options to  various  individuals
outside  of the Plan,  all of which were  granted  at a price  equal to the fair
market  value of the shares at the date of grant as  determined  by the Board of
Directors.






                                      F-11

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)



<TABLE>

6. Common Stock (continued)

The following table summarizes option activity:

<CAPTION>


                                              Shares
                                            Available          Options                            Options Price
                                            for Grant        Outstanding        Exercisable         Per Share
                                       --------------------------------------------------------------------------------
<S>                                          <C>                <C>               <C>            <C>      


Balance January 1, 1994                        116,500            378,750           177,750      $  .93 - $ 1.36
Shares reserved                                 80,000                 --                --                   --
Granted or became exercisable                 (172,500)           172,500            93,375        3.60 -   5.63
Exercised                                           --            (71,250)          (71,250)       1.13 -   1.33
Canceled                                        24,750            (24,750)           (1,500)                1.33
                                              --------          ---------         ---------
Balance December 31, 1994                       48,750            455,250           198,375         .93 -   5.63
Shares reserved                                400,000                 --                --                   --
Granted or became exercisable                 (435,000)           435,000           136,875        6.75 -  13.56
Exercised                                           --           (131,500)         (131,500)        .93 -   3.60
Canceled                                        51,250            (66,250)          (15,000)       1.13 -   5.63
                                             ---------          ---------         ---------
Balance December 31, 1995                       65,000            692,500           188,750        1.33 -  13.56
Granted                                       (230,000)           230,000           165,625        5.13 -   7.38
Exercised                                           --           (207,500)         (207,500)       1.33 -   8.00
Canceled                                       520,000           (520,000)          (13,750)       1.88 -  13.56
                                              --------          ---------         ---------
Balance September 30, 1996 (unaudited)         355,000            195,000           133,125        1.33 -  11.63
                                              ========          =========         =========

</TABLE>


Stock Warrants

Warrants for the purchase of up to 150,000 shares of Common Stock were issued in
connection  with the sale of  unsecured  notes in March 1994.  The  warrants are
exercisable  for a period of five years from the date of  issuance,  and have an
exercise  price of $3.38 per share.  During  1994,  warrants for the purchase of
49,000 shares of Common Stock were exercised.

For a nominal  consideration,  a warrant  was issued to the  underwriter  of the
Company's  initial  public  offering for the purchase of up to 186,500 shares of
Common  Stock at a price of $4.95 per share.  The warrant is  exercisable  for a
period of four years commencing October 21, 1995.






                                      F-12

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)




6. Common Stock (continued)

In  addition  to the above  warrants,  at  December  31,  1995 the  Company  had
exercisable  outstanding  warrants to purchase 166,614 shares of Common Stock as
follows:

                                                                Price
                                              Shares          Per Share
                                        -----------------------------------
Year expires:
  1997                                          42,864            $1.17
  1998                                          37,500             1.33
  1998                                          86,250             2.00
                                               166,614      $1.17-$2.00


7. Settlement Agreement with Terminated Employee

In February 1993, the Company reached an agreement with a terminated employee to
resolve,  settle and  discharge  all claims of the  Company  arising  out of the
employment  relationship with the Company.  As part of the agreement,  a 10-year
option,  which is not subject to terms of the stock option plan,  was granted to
purchase  37,500  shares of  Common  Stock at $.93 per  share.  The  option  was
exercised in February 1995.

8. Major Customers

The  Company  sells  its  product  to large  commercial  enterprises  in need of
security  surveillance  systems. Its major customers to date have been primarily
large retailers.  The Company  performs credit  evaluations and does not require
collateral of its customers.

The Company  recorded  sales to certain  customers  comprising  more than 10% of
total sales as follows:


                                                          Nine Months Ended
                           Year Ended December 31,          September 30,
                        -----------------------------    ---------------------
                        1993         1994        1995       1995        1996
                        ----         ----        ----       ----        ----

Customer  A..........    36%            8%         2%         2%         --
          B..........    11            48         12         13           1%
          C..........    --            33         67         65          69
          D..........    10             3          1          1           2
          E..........    12             3          9         10          --
          F..........    14            --         --         --          --
          G..........    --             5          1          1          15
Others...............    17            --          8          8          13
                        ---           ---        ---        ---         ---
                        100%          100%       100%       100%        100%
                        ===           ===        ===        ===         ===









                                      F-13

<PAGE>


                            Video Sentry Corporation

                    Notes to Financial Statements (continued)




9. Profit Sharing Plan

The Company has a Profit Sharing Plan (the Plan) which covers  substantially all
employees  meeting the eligibility  requirements.  Contributions to the Plan are
determined  by the Board of Directors on an annual  basis.  The Plan  contains a
provision for a deferred  compensation plan under Section 401(k) of the Internal
Revenue  Code for eligible  employees.  No  contributions  have been made by the
Company to the Plan.

10. Employee Stock Purchase Plan

In 1995,  the Company has  established  an Employee  Stock Purchase Plan and has
reserved  100,000  shares of  Common  Stock for  future  issuance.  The Board of
Directors  has approved the plan,  subject to  shareholder  approval at the next
annual  meeting.  As of December 31,  1995,  no shares had been issued under the
plan.

11. Offering Costs and Officer Severance

During 1995, the Company proposed to offer additional shares of its Common Stock
to the public. The proposed offering was subsequently canceled and, as a result,
the Company expensed $207,000 of related costs.

In  January 4,  1996,  the Chief  Executive  Officer  of the  Company  resigned.
Pursuant to his employment  agreement,  this  individual  received  severance of
$115,000. This amount was expensed in December 1995.

12. Management's Plan and Subsequent Event

During 1995,  the Company  spent  approximately  $2,631,000  on  operations  and
incurred  a net  loss of  approximately  $1,681,000.  In  order to meet its cash
requirements  and fund  planned  operations,  the  Company  entered  into a $2.5
million working capital  revolving line of credit with a bank in March 1996. The
line of credit is secured by  substantially  all of the Company's assets and the
personal  guarantee  of the  Company's  President.  The line of  credit  accrues
interest  at a rate equal to 3% above the bank's  reference  rate and matures in
March 1998.  The Company  expects the proceeds from the line of credit and other
financing  agreements  will be  sufficient  to fund its  operating  expenses and
capital requirements through 1996.

13. Subsequent Events (Unaudited)

In May and July 1996, the Company entered into  promissory  notes with the Chief
Executive  Officer of and an investor in the Company for $500,000 and  $250,000,
respectively.  The notes  payable bear interest at 10% per annum and are secured
by all of the assets of the Company. The notes were repaid in September 1996.

In September 1996, the Company entered into a promissory note with a shareholder
of the Company for $1,000,000.  The note payable bears interest at 10% per annum
and is  secured  by all of the  assets  of the  Company.  The  note  payable  is
subordinated to the working capital revolving line of credit (see Note 12).

In October 1996, the Company received  $125,000 from the Chief Executive Officer
of the Company under a promissory  note which allows the Company to borrow up to
$500,000. The note payable bears interest at 10% per annum and is secured by all
of the assets of the Company.  The note payable is  subordinated  to the working
capital revolving line of credit (see Note 12).





                                      F-14

<PAGE>

       

KNOGO NORTH AMERICA INC. AND SUBSIDIARIES


INDEX TO FINANCIAL STATEMENTS


                                                                           PAGE
                                                                           ----


Independent Auditors' Report                                              F-16

Consolidated balance sheets - December 31, 1994 and 1995                  F-17
  and September 30, 1996 (unaudited)

Consolidated  statements of operations - year ended                       F-18
  February 28, 1994,  ten  months  ended  December 31,  1994,
  year ended  December 31, 1995 and the nine
  months ended September 30, 1995 (unaudited)
  and 1996 (unaudited)

Consolidated  statements of shareholders'  equity -                       F-19
  year ended  February 28, 1994, ten months ended
  December 31, 1994, year ended December 31, 1995 and the
  nine months ended September 30, 1996 (unaudited)

Consolidated  statements of cash flows - year ended                       F-20
  February 28, 1994, ten months ended  December 31, 1994,
  year ended December 31, 1995 and the nine
  months ended September 30, 1995 (unaudited) and 1996 (unaudited)



Notes to consolidated financial statements                                F-22



SCHEDULE II -                                                             F-33
   Valuation and Qualifying Accounts











                                      F-15

<PAGE>



INDEPENDENT AUDITORS' REPORT


Board of Directors
Knogo North America Inc.
Hauppauge, New York

We have  audited the  accompanying  consolidated  balance  sheets of Knogo North
America Inc. and  subsidiaries  as of December 31, 1994 and 1995 and the related
consolidated  statements of operations,  shareholders' equity and cash flows for
the year ended February 28, 1994, the ten months ended December 31, 1994 and the
year ended December 31, 1995. These financial  statements are the responsibility
of the Company's management.  Our responsibility is to express an opinion on the
consolidated financial statements based on our audits.

We  conducted  our  audits  in  accordance  with  generally   accepted  auditing
standards.  Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements.  An audit also includes
assessing the  accounting  principles  used and  significant  estimates  made by
management,  as well as evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for our opinion.

In our opinion,  such consolidated  financial  statements present fairly, in all
material  respects,  the consolidated  financial position of Knogo North America
Inc. and subsidiaries as of December 31, 1994 and 1995, and the results of their
operations  and their cash flows for the year ended  February 28, 1994,  the ten
months  ended  December  31,  1994  and the  year  ended  December  31,  1995 in
conformity with generally accepted accounting principles.

As discussed in Note 1 to the consolidated financial statements, on December 29,
1994 the  Company  and Knogo  Corporation  consummated  Merger  and  Divestiture
Agreements with Sensormatic Electronics Corporation.


DELOITTE & TOUCHE LLP

Jericho, New York
February 23, 1996
(March 22, 1996 as to Note 14c, 
October 10, 1996 as to Note 14b and 
December 24, 1996 as to Note 14d)






                                      F-16

<PAGE>

<TABLE>


KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
CONSOLIDATED BALANCE SHEETS
- --------------------------------------------------------------------------------
(in thousands, except par value amounts)
<CAPTION>
   


                                                                        December 31,          December 31,       September 30,
                                                                            1994                  1995              1996
                                                                     ---------------        --------------        -------------
                                                                                                                  (unaudited)
<S>                                                                       <C>                   <C>                 <C>


ASSETS
CURRENT ASSETS
   Cash                                                                   $  1,258              $    409            $  2,482
   Accounts receivable, less allowance for doubtful accounts
     of $862, $931 and $770, respectively                                    4,742                 9,599               7,243
   Net investment in sales-type leases - current portion                       561                   778               1,840
   Inventories                                                               6,335                 5,954               6,798
   Prepaid expenses and other current assets                                 1,461                   496                 504
                                                                          --------             ---------           ---------
     Total current assets                                                   14,357                17,236              18,867

NET INVESTMENT IN SALES-TYPE LEASES -
   non-current portion                                                       1,240                 1,753               1,395
SECURITY DEVICES ON LEASE, net                                                 512                   399                 345
PROPERTY, PLANT AND EQUIPMENT, net                                           9,842                 9,081               8,950
INTANGIBLES, including patent costs, less accumulated
   amortization of $518, $359 and $403, respectively                           275                   236                 349
OTHER ASSETS                                                                   296                   633                 579
                                                                           -------               -------             -------
                                                                           $26,522               $29,338             $30,485
                                                                           =======               =======             =======
LIABILITIES AND SHAREHOLDERS' EQUITY
CURRENT LIABILITIES
   Accounts payable                                                        $   759               $ 2,194             $   999
   Accrued liabilities                                                       3,473                 3,070               2,834
   Obligations under capital leases - current portion                          245                   277                 304
   Deferred lease rentals                                                      321                   369                 313
                                                                           -------               -------             -------
     Total current liabilities                                               4,798                 5,910               4,450

OBLIGATIONS UNDER CAPITAL LEASES - non-current
   portion                                                                     700                   471                 283
DEFERRED INCOME TAXES                                                          136                   288                 435
MINORITY INTEREST IN SUBSIDIARY                                                 --                    --                 459

COMMITMENTS AND CONTINGENCIES
   (Notes 12, 13 and 14)

SHAREHOLDERS' EQUITY
   Preferred stock, $.01 par value; authorized 3,000
     shares; none issued
   Common stock, $.01  par value; authorized 10,000 shares,
     issued and outstanding 5,648, 5,720 and 5,773 shares,
     respectively                                                               56                    57                  58
   Additional paid-in capital                                               20,832                20,881              21,078
   Retained earnings                                                            --                 1,731               3,722
                                                                           -------               -------             -------
                                                                            20,888                22,669              24,858
                                                                           -------               -------             -------
                                                                           $26,522               $29,338             $30,485
                                                                           =======               =======             =======
    
<FN>
See notes to consolidated financial statements.
</FN>
</TABLE>





                                      F-17

<PAGE>

<TABLE>


KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF OPERATIONS
- --------------------------------------------------------------------------------
(in thousands)

<CAPTION>


                                                                                                               Nine Months Ended
                                                     Year Ended    Ten Months Ended    Year Ended                September 30,
                                                    February 28,    December 31,       December 31,      ---------------------------
                                                        1994            1994              1995             1995            1996
                                                  --------------   ---------------     ------------      -----------     ---------
<S>                                                   <C>             <C>             <C>                 <C>            <C>
REVENUES                                                                                                        (Unaudited)
   Sales of security devices and related
     interest income                                  $ 15,385        $ 11,402        $ 14,625            $ 11,448       $ 11,932
   Sales to Sensormatic/affiliates                      11,375           6,957          12,043               9,062          3,990
   Service revenues and other                            2,858           2,322           2,736               1,879          2,258
                                                      --------        --------        --------            --------       --------
                                                        29,618          20,681          29,404              22,389         18,180
                                                      --------        --------        --------            --------       --------

COSTS AND EXPENSES
  Cost of security devices sold                          7,283           5,078           6,630               5,186          6,805
  Cost of sales to Sensormatic/affiliates                7,348           4,963           7,795               5,982          2,593
  Customer services expenses                             3,984           3,353           3,235               2,621          2,197
  Selling, general and administrative
     expenses                                            9,227           9,548           8,235               6,132          5,387
  Research and development                                 655             483           1,537               1,177          1,069
  Interest (income) expense                                359             114              31                  26            (64)
                                                      --------        --------        --------            --------       --------

OPERATING PROFIT (LOSS)                                    762          (2,858)          1,941               1,265            193

OTHER INCOME - Gain on sale of assets                      --              --              --                  --           2,462
                                                      --------        --------        --------            --------       --------

INCOME (LOSS) BEFORE
  INCOME TAXES                                             762          (2,858)          1,941               1,265          2,655

INCOME TAXES (BENEFIT)                                     639             (25)            210                 190            664
                                                      --------        --------        --------            --------       --------

NET INCOME (LOSS)                                     $    123        $ (2,833)       $  1,731            $  1,075       $  1,991
                                                      ========        ========        ========            ========       ========

NET INCOME PER SHARE                                  $    *          $    *          $    .29            $    .18       $    .33
                                                      ========        ========        ========            ========       ========

WEIGHTED AVERAGE COMMON
   SHARES                                                  *               *             5,887               5,856          6,101
                                                      ========        ========        ========            ========       ========

<FN>

*  Historical  per share data for net income (loss) for the year ended  February
   28, 1994 and the ten months ended December 31, 1994 has not been presented as
   Knogo  North  America  Inc.  was not a  publicly-held  company  during  these
   periods.

See notes to consolidated financial statements.
</FN>
</TABLE>





                                      F-18

<PAGE>


<TABLE>


KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
- --------------------------------------------------------------------------------
(in thousands)

<CAPTION>

                                             Common Stock          Additional                    Due             Total
                                        -----------------------     Paid-In       Retained      From         Shareholders'
                                         Shares        Amount       Capital       Earnings    Affiliates        Equity
                                        --------      ---------   -----------    ----------  -------------    -------------

<S>                                     <C>             <C>        <C>            <C>           <C>              <C>



BALANCE
   MARCH 1, 1993                            --        $   --       $ 32,991       $   --        $ (4,683)        $ 28,308

Net income                                  --            --            123           --            --                123

Transactions with affiliates                --            --            --            --            (842)            (842)

Equity adjustments resulting
   from Merger and Divestiture              --            --           (534)          --            --               (534)
                                        --------      --------      --------       --------      --------         --------

BALANCE,
  FEBRUARY 28, 1994                         --            --         32,580           --          (5,525)          27,055

Net loss                                    --            --         (2,833)          --            --             (2,833)

Transactions with affiliates                --            --            --            --          (1,953)          (1,953)

Equity adjustments resulting
   from Merger and Divestiture              --            --          1,742           --            --              1,742

Revaluation of corporate
 headquarters                               --            --         (3,123)          --            --             (3,123)

Establishment of Knogo
   N.A. and distribution of
   common stock                            5,648            56       (7,534)          --           7,478             --
                                        --------      --------     --------       --------      --------         --------

BALANCE,
   DECEMBER 31, 1994                       5,648            56       20,832           --            --             20,888

Net income                                  --            --            --           1,731          --              1,731

Final distribution of common
   stock                                      34          --            (16)          --            --                (16)

Exercise of stock options                     38             1           65           --            --                 66
                                        --------      --------      --------       --------      --------         --------

BALANCE,
   DECEMBER 31, 1995                       5,720            57       20,881          1,731          --             22,669


Net income (unaudited)                      --            --            --           1,991          --              1,991

Exercise of stock options
   (unaudited)                                53             1          197           --            --                198
                                        --------      --------     ---------       --------      --------        ---------

BALANCE, SEPTEMBER 30,
   1996 (unaudited)                        5,773      $     58     $ 21,078       $  3,722      $   --          $ 24,858
                                        ========      ========     =========      =========     ========        =========


<FN>

See notes to consolidated financial statements.
</FN>

</TABLE>




                                      F-19

<PAGE>

<TABLE>


KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
- --------------------------------------------------------------------------------
(in thousands)

<CAPTION>

                                                                             Ten                                  Nine
                                                        Year Ended       Months Ended      Year Ended          Months Ended
                                                       February 28,       December 31,     December 31,        September 30,
                                                          1994               1994             1995             1995         1996
                                                       ------------      -------------    -------------     ----------    --------
                                                                                                                 (Unaudited)
<S>                                                       <C>              <C>              <C>             <C>           <C>


CASH FLOWS FROM OPERATING
ACTIVITIES
   Net income (loss)                                      $  123           $ (2,833)         $1,731         $ 1,075        $ 1,991
   Adjustments to reconcile net income (loss)
     to net cash (used in) provided by
     operating activities:
     Depreciation and amortization of security
       devices and property, plant and
       equipment                                           1,245              1,114           1,103             830            847
     Amortization of intangibles                              97                 67              64              29             44
     Deferred income taxes                                  (147)              (220)            152             126            147
     Provision for bad debts                                 666                661             352             307             69
     Changes in operating assets and
     liabilities:
       (Increase) decrease in accounts
       receivable                                            848                282          (5,209)         (3,514)         2,287
       (Increase) decrease in net investment in
         sales-type leases                                 1,160                217            (730)           (861)          (704)
       Decrease (increase) in inventories                   (789)             2,218             381           1,508           (708)
       Decrease (increase) in prepaid
         expenses and other assets                          (141)              (901)            628             135            182
       Increase (decrease) in accounts payable
         and accrued liabilities                           2,547             (2,509)          1,032             591         (1,431)
       Increase (decrease) in deferred lease
         rentals                                              (1)                52              48             135            (56)
       Increase in due from affiliates                      (842)            (1,953)             --              --             --
                                                        ========           ========          ======         =======        =======

         Net cash (used in) provided by
            operating activities                           4,766             (3,805)           (448)            361          2,668
                                                        ========           ========          ======         =======        =======

CASH FLOWS FROM INVESTING
ACTIVITIES
  Purchase of property, plant and equipment, net            (640)              (565)           (202)           (153)          (438)
   Decrease (increase) in security devices on
     lease                                                  (261)              (278)             21              71            (85)
   Increase in intangibles                                   (19)               (11)            (25)            (21)           (25)
                                                        ========           ========          ======         =======        =======

          Net cash used in investing activities             (920)              (854)           (206)           (103)          (548)
                                                        ========           ========          ======         =======        =======


<FN>

See notes to consolidated financial statements.
</FN>
</TABLE>



                                      F-20

<PAGE>



<TABLE>

KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
CONSOLIDATED STATEMENTS OF CASH FLOWS
- --------------------------------------------------------------------------------
(in thousands)

<CAPTION>

                                                                         Ten                                   Nine
                                                       Year Ended     Months Ended      Year Ended           Months Ended
                                                      February 28,    December 31,     December 31,         September 30,
                                                          1994            1994             1995          1995           1996
                                                     --------------   ------------    -------------   ----------      -------
                                                                                                           (Unaudited)
<S>                                                   <C>              <C>             <C>              <C>             <C>

CASH FLOWS FROM FINANCING ACTIVITIES
   Equity adjustments resulting from
     Merger and Divestiture                              (534)           1,742            --               --               --
   Repayment of obligations under capital
     leases                                              (149)            (156)           (245)            (182)            (113)
   Exercise of stock options                             --               --                66             --                 66
   Other                                                 --               --               (16)             (10)            --
                                                      -------          -------         -------          -------          -------
         Net cash (used in) provided by
           financing activities                          (683)           1,586            (195)            (192)             (47)
                                                      -------          -------         -------          -------          -------
(DECREASE) INCREASE IN CASH                             3,163           (3,073)           (849)              66            2,073
CASH, at beginning of period                            1,168            4,331           1,258            1,258              409
                                                      -------          -------         -------          -------          -------
CASH, at end of period                                $ 4,331          $ 1,258         $   409          $ 1,324          $ 2,482
                                                      =======          =======         =======          =======          =======
SUPPLEMENTAL DISCLOSURE OF
  CASH FLOW INFORMATION
  Cash paid during the period for
     Interest                                         $    72          $   103         $    86          $    65          $    60
                                                      =======          =======         =======          =======          =======
     Income taxes                                     $   354          $   645         $    26          $    23          $    83
                                                      =======          =======         =======          =======          =======

SUPPLEMENTAL DISCLOSURE OF
   NON-CASH INVESTING AND
   FINANCING ACTIVITIES
   Capital lease obligation incurred for
     the purchase of office equipment and
     other assets                                     $    40          $   413         $    48          $  --            $    48
                                                      =======          =======         =======          =======          =======

                                                                                                       (Concluded)


<FN>

See notes to consolidated financial statements.
</FN>
</TABLE>





                                      F-21

<PAGE>



KNOGO NORTH AMERICA INC. AND SUBSIDIARIES


NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
YEAR ENDED  FEBRUARY 28, 1994,  TEN MONTHS ENDED  DECEMBER 31, 1994,  YEAR ENDED
DECEMBER  31,  1995  AND THE  NINE  MONTHS  ENDED  SEPTEMBER  30,  1995 AND 1996
(Information  as it relates to the nine months ended September 30, 1995 and 1996
is unaudited)
- --------------------------------------------------------------------------------
1.       BASIS OF PRESENTATION

         Knogo  North  America  Inc.  and  subsidiaries  ("Knogo  N.A."  or  the
         "Company") was formerly a wholly owned subsidiary of Knogo  Corporation
         ("Old Knogo").  The Company was  incorporated in Delaware on August 12,
         1994 and was  established in connection  with the  consummation  of the
         transactions described below .

         On December 29, 1994, (the "Divestiture Date") Old Knogo and Knogo N.A.
         consummated  a  Merger  Agreement  and  a  Divestiture  Agreement  with
         Sensormatic Electronics Corporation ("Sensormatic") whereby immediately
         prior to Old Knogo being merged into  Sensormatic  (the "Merger"),  Old
         Knogo  contributed  to  Knogo  N.A.,  certain  assets  and  liabilities
         relating to its operations in the United States, Canada and Puerto Rico
         (the "Divestiture Agreement"). Pursuant to the Merger each share of Old
         Knogo  common  stock was  converted  into .5513  shares of  Sensormatic
         common  stock.  Pursuant  to  the  Divestiture  Agreement,   Old  Knogo
         shareholders  received  one share of Knogo N.A.  common  stock for each
         share of Old Knogo stock held.  At the  Divestiture  Date,  the Company
         changed its fiscal year end from February 28 to December 31.

         The  accompanying  consolidated  financial  statements  include certain
         assets and liabilities of Old Knogo, on an historical  basis,  relating
         to Old Knogo's operations in the United States,  Canada and Puerto Rico
         ("Knogo  N.A.  Territory").  Pursuant  to the  Merger  and  Divestiture
         Agreements,  the net worth of Knogo N.A.  was  adjusted to a target net
         worth of approximately  $24 million (the "Target Net Worth"),  based on
         the historical  carrying value of Old Knogo's assets and liabilities at
         the  Divestiture  Date.  The  Target  Net  Worth  was  achieved  at the
         Divestiture  Date  by  a  combination  of  inventory  transfers  and  a
         receivable due from Sensormatic. The Target Net Worth was then adjusted
         to reflect the revaluation of Knogo N.A.'s corporate  headquarters (see
         Note 6).

         As  a  result  of  the  Merger  and  Divestiture  Agreements,   certain
         adjustments  to the  equity  accounts  of the  Company  were  required.
         Certain assets and liabilities  have been allocated  between Knogo N.A.
         and  Old  Knogo  based  on the  terms  of the  Merger  and  Divestiture
         Agreements.   These  allocations  are  presented  in  the  consolidated
         statements of shareholders' equity as equity adjustments resulting from
         the Merger and Divestiture.  Transactions with affiliates represent the
         net  change  in  balances  between  the  Company  and Old Knogo and its
         international   subsidiaries.   In  addition,  Knogo  N.A.'s  corporate
         headquarters was revalued from Old Knogo's historical carrying value.

         Certain expenses reflected in the consolidated statements of operations
         for the year ended  February 28, 1994 and the ten months ended December
         31, 1994 include corporate allocations from Old Knogo, which were based
         on  specific  personnel,  space,  estimates  of time  spent to  provide
         services,   or  other  appropriate  bases.  These  allocations  include
         financial   reporting,   personnel,   insurance,   legal,   information
         management,  and other  miscellaneous  services.  Included  in selling,
         general and administrative expenses were $2,163,000 and $2,983,000,  of
         allocated  corporate  expenses for the year ended February 28, 1994 and
         the ten months  ended  December  31,  1994,  respectively.  Included in
         selling,  general and administrative  expenses for the ten months ended
         December 31, 1994 were  $1,575,000  in expenses  incurred in connection
         with the Merger and Divestiture with Sensormatic. In addition, research
         and development  expenses totaling $557,000 and $382,000,  for the year
         ended  February  28, 1994 and the ten months  ended  December 31, 1994,
         respectively,  represent corporate allocations. Management believes the
         foregoing  allocations  were  made  on a  reasonable  basis  and  would
         approximate  the costs which would have been  incurred  had the Company
         operated on a





                                      F-22

<PAGE>



         stand-alone basis and in a similar manner. The Company anticipates that
         current cash  reserves,  cash  generated by  operations,  including the
         Supply  Agreement with Sensormatic (see Note 13) and its available bank
         credit  facility will be adequate to finance the Company's  anticipated
         working  capital  requirements  as well as future  capital  expenditure
         requirements for at least the next twelve months.

2.       SIGNIFICANT ACCOUNTING POLICIES

         a.  Business - Knogo N.A.  is engaged in only one  segment  and line of
         business,  the manufacture,  distribution,  installation and service of
         systems  designed to detect the  unauthorized  movement of articles and
         persons. The Company's customers are principally in the retail industry
         and libraries.

         b. Principles of Consolidation - The consolidated  financial statements
         include the  accounts of the Company and its wholly  owned  subsidiary,
         Knogo Caribe, Inc. All intercompany balances and transactions have been
         eliminated in consolidation.

         c. Revenue  Recognition  - The Company  manufactures  security  devices
         which it  offers  for sale or  lease.  Revenue  related  to the sale of
         equipment is recorded at the time of shipment or upon  acceptance  by a
         third-party  leasing  company  of a  customer  lease  and  the  related
         equipment.  In  addition,  in  accordance  with  Statement of Financial
         Accounting  Standards No. 13, "Accounting for Leases",  lease contracts
         which meet the  following  criteria  are  accounted  for as  sales-type
         leases:  collection  is  reasonably  assured,  there  are no  important
         uncertainties,  and (l) the present  value of the rental  payments over
         the  term  of the  lease  is at  least  90% of the  fair  value  of the
         equipment  or (2)  the  lease  term  is  equal  to 75% or  more  of the
         estimated  economic life of the  equipment or (3) the lease  contains a
         bargain purchase option. Under this method,  revenue is recognized as a
         sale at the time of  installation  or  acceptance  by the  lessee in an
         amount equal to the present value of the required rental payments under
         the fixed,  noncancellable lease term. The difference between the total
         lease  payments and the present value is amortized over the term of the
         lease so as to  produce a constant  periodic  rate of return on the net
         investment in the lease.

         The  operating  method of  accounting  for leases is followed for lease
         contracts  not  meeting  the  above  criteria.  Under  this  method  of
         accounting, aggregate rental revenue is recognized over the term of the
         lease (usually 12-48 months), which commences with date of installation
         or acceptance by the lessee.

         The  Company  has sold  certain  of its lease  receivables  subject  to
         recourse to third-party investors. The uncollected principal balance of
         the  receivables  sold totaled  approximately  $998,000 and $353,000 at
         December  31,  1994  and  1995,  respectively.   Receivables  sold  are
         supported by the underlying  equipment  value and credit  worthiness of
         customers.  The Company records reserves for receivables sold which may
         be uncollectible.

         Service revenues are recognized as earned and maintenance  revenues are
         recognized  ratably over the service  contract  period.  Warranty costs
         associated  with products sold with warranty  protection  are estimated
         based on the Company's historical experience and recorded in the period
         the product is sold.

         d. Inventories - Inventories are stated at the lower of cost (first-in,
         first-out  method) or market.  Component parts and systems in inventory
         available  for assembly and customer  installation  are  considered  as
         work-in-process.

         e. Security  Devices on Lease - Security devices on lease are stated at
         cost and consist of completed systems which have been installed.

         f.  Depreciation and Amortization - Depreciation of security devices on
         lease and  property,  plant and  equipment  is  provided  for using the
         straight-line method over their related estimated useful lives. The





                                      F-23

<PAGE>



         security  devices  generally have estimated  useful lives of six years,
         except the cost of security  devices  related to operating  leases with
         purchase options are depreciated over the life of the lease.

         g. Intangibles - Costs and expenses  incurred in obtaining  patents are
         amortized  over the  remaining  life of the patents,  not  exceeding 17
         years, using the straight-line method.

         h. Deferred Lease Rentals - Deferred  lease rentals  consist of amounts
         of rentals and maintenance  related to operating  leases billed or paid
         in advance.

         i. Income Taxes - The Company accounts for income taxes under Statement
         of  Financial  Accounting  Standards  No. 109,  "Accounting  for Income
         Taxes",  which  requires an asset and  liability  approach to financial
         accounting and reporting for income taxes.

         The Company has  computed  its  provision  for income taxes for the ten
         months  ended  December  31, 1994 and the year ended  February 28, 1994
         assuming that it had operated on a stand-alone  basis.  Certain amounts
         have been  allocated  to the  Company  from Old Knogo  relating  to the
         estimated settlement costs of tax examinations.

         j. Income Per Common Share - Income per common share is computed  using
         the weighted  average  number of common shares  outstanding  during the
         year, plus when dilutive,  net additional shares issuable upon exercise
         of stock options.

         k.  Foreign  Currency  Translation  - The  functional  currency  of the
         Company's  foreign  entity  is the US  dollar.  Therefore,  assets  and
         liabilities of the foreign entity is translated  using a combination of
         current  and  historical   rates.   Income  and  expense  accounts  are
         translated  primarily using the average rate in effect during the year.
         Unrealized  foreign  exchange  gains and  (losses)  resulting  from the
         translation  of this  entity  are  included  in  selling,  general  and
         administrative  expenses  and  amounted  to  approximately  ($164,000),
         ($46,000)  and $20,000 for the year ended  February 28,  1994,  the ten
         months ended  December  31, 1994 and the year ended  December 31, 1995,
         respectively.

         l. Use of  Estimates  - The  preparation  of  financial  statements  in
         conformity  with  generally  accepted  accounting  principles  requires
         management to make estimates and  assumptions  that affect the reported
         amounts of assets and liabilities  and disclosure of contingent  assets
         and  liabilities  at the  date  of the  financial  statements  and  the
         reported amounts of revenues and expenses during the reporting  period.
         Actual results could differ from those estimates.

         m.  Unaudited  Interim  Financial   Statements  -  In  the  opinion  of
         management,  the unaudited  consolidated  financial  statements for the
         nine months ended  September 30, 1995 and 1996 are presented on a basis
         consistent  with the  audited  consolidated  financial  statements  and
         reflect  all   adjustments,   consisting   of  only  normal   recurring
         adjustments,  necessary for a fair presentation of the results thereof.
         The  results of  operations  for interim  periods  are not  necessarily
         indicative of the results to be expected for the entire year.

         n. Reclassifications - Certain amounts in the prior years' consolidated
         financial  statements  have been  reclassified  to  conform to the 1995
         presentation.






                                      F-24

<PAGE>



3.       NET INVESTMENT IN SALES-TYPE LEASES AND OPERATING LEASE DATA

         The Company is the lessor of security devices under agreements expiring
         in various years through 2001. The net investment in sales-type  leases
         consist of:

                                      December 31,   December 31,  September 30,
                                          1994          1995           1996
                                      ------------   ------------  -------------
                                                    (in thousands)

Minimum lease payments receivable          $ 2,237      $ 3,183         $ 3,700
Allowance for uncollectible minimum
  lease payments                              (111)        (159)           (185)
Unearned income                               (355)        (523)           (310)
Unguaranteed residual value                     30           30              30
                                           -------      -------         -------
Net investment                               1,801        2,531           3,235
Less current portion                           561          778           1,840
                                           -------      -------         -------
Non-current portion                        $ 1,240      $ 1,753         $ 1,395
                                           =======      =======         =======



         The future minimum lease payments  receivable under  sales-type  leases
         and noncancellable operating leases are as follows:

                                        Sales-Type                 Operating
                                          Leases                    Leases
                                        ----------                 ---------
                                                  (in thousands)
Year Ending December 31,
         1996                             $ 1,081                     $ 368
         1997                                 876                       179
         1998                                 590                        74
         1999                                 416                        15
         2000 and thereafter                  220                        59
                                          -------                     -----
                                          $ 3,183                     $ 695
                                          =======                     =====


4.       INVENTORIES

         Inventories consist of the following:

                                December 31,   December 31,   September 30,
                                    1994           1995            1996
                                -------------  ------------    -------------
                                                 (in thousands)
Raw materials                        $1,919         $2,692         $2,727
Work-in-process                       2,346          1,986          2,374
Finished goods                        2,070          1,276          1,697
                                     ------         ------         ------
                                     $6,335         $5,954         $6,798
                                     ======         ======         ======



         Reserves  for  excess  and  obsolete   inventory  totaled   $1,343,000,
         $1,441,000  and  $1,418,000  as of  December  31,  1994  and  1995  and
         September 30, 1996,  respectively and have been included as a component
         of the above amounts.






                                      F-25

<PAGE>



5.       SECURITY DEVICES ON LEASE

         Security devices are stated at cost and are summarized as follows:

                                          December 31,              December 31,
                                             1994                       1995
                                          ------------              -----------
                                                    (in thousands)
Security devices on lease                    $ 869                      $ 644
Less allowance for depreciation                357                        245
                                             -----                      -----
                                             $ 512                      $ 399
                                             =====                      =====



6.       PROPERTY, PLANT AND EQUIPMENT

         Property,  plant and equipment are stated at cost and are summarized as
         follows:

                                   Estimated Useful   December 31,  December 31,
                                     Live (Years)         1994         1995
                                   -----------------  ------------  ------------
                                                     (in thousands)

Land                                                  $ 3,099          $ 3,099
Building and improvements                 25-40         5,826            5,828
Machinery and equipment                    3-10         5,765            5,885
Furniture, fixtures and office
  equipment                                3-10         3,199            3,291
                                                      -------          -------
                                                       17,889           18,103
Less allowance for depreciation                         8,047            9,022
                                                      -------          -------
                                                      $ 9,842          $ 9,081
                                                      =======          =======



         As a result of the Merger and Divestitur Agreements (see Note 1), Knogo
         N.A.'s corporate  headquarters was revalued from Old Knogo's historical
         carrying  value by $3,123,000 due to the manner and extent that it will
         be utilized on a prospective basis.


7.       OTHER ASSETS

         In January 1995, the Company sold its guest house in Puerto Rico, which
         was included in prepaid  expenses and other current  assets at December
         31, 1994,  for $800,000  which  approximated  its carrying  value.  The
         Company  holds notes with a present  value of $580,000 at December  31,
         1995 which are receivable in varying amounts over a five year period.






                                      F-26

<PAGE>



8.       ACCRUED LIABILITIES

         Accrued liabilities consist of the following:

                                               December 31,     December 31,
                                                   1994            1995
                                               ------------    -------------
                                                       (in thousands)

Accrued warranty costs                             $  633         $  659
Accrued salaries, employee benefits
   and payroll taxes                                  609            720
Reserve for recourse sales                            526            --
Customer deposits payable                             521            466
Other accrued liabilities                           1,184          1,225
                                                   ------         ------
                                                   $3,473         $3,070
                                                   ======         ======



9.       LINE OF CREDIT

   
         The Company has a $5 million  unsecured  revolving credit and term loan
         agreement  with a  bank.  Revolving  loans  may  be  drawn  under  this
         agreement  until  May 31,  1997,  at  which  time  the  borrowings  are
         convertible   into  term  loans  payable  in  sixteen  equal  quarterly
         installments.  All borrowings  under the agreement bear interest at the
         prime  rate or the  adjusted  Libor rate plus 2%.  The  Company  pays a
         commitment  fee  of  1/4  of 1% on any  unused  portion  of the  credit
         facility.  The terms of the  agreement,  among other  matters,  provide
         restrictions on additional borrowings, capital expenditures and payment
         of  dividends  and require  that the Company  maintain  certain debt to
         worth,  quick and interest  coverage  ratios.  There were no borrowings
         under this  agreement  at any time during the year ended  December  31,
         1995.
    


10.      OBLIGATIONS UNDER CAPITAL LEASES

         The Company leases  computer  equipment and related items under capital
         lease  arrangements  with  interest  charged  at a rate of 9%.  Minimum
         annual rentals are as follows (in thousands):


Year ending December 31,
         1996                                                  $ 336
         1997                                                    299
         1998                                                    115
         1999                                                    102
         2000                                                     14
                                                               -----
                                                                 866
         Less amount representing interest                       118
                                                               -----
         Present value of minimum rentals                        748
         Less current portion                                    277
                                                               -----
         Non-current portion                                   $ 471
                                                               =====



         The computer  equipment  and related items are included in property and
         equipment  and  other  assets  with a gross  value  of  $1,301,000  and
         $1,349,000 at December 31, 1994 and 1995, respectively,  and a net book
         value of  $1,092,000  and  $880,000  at  December  31,  1994 and  1995,
         respectively.







                                      F-27

<PAGE>



11.      SHAREHOLDERS' EQUITY

         a. Stock Option Plan - In November  1994,  Knogo N.A.  adopted the 1994
         Stock Incentive Plan of Knogo North America Inc. (the "1994 Plan"). The
         1994 Plan  provides  for grants up to 725,000  options to purchase  the
         Company's  common  stock.  Awards may be  granted  by the stock  option
         committee  to  eligible   employees  in  the  form  of  stock  options,
         restricted  stock awards,  phantom  stock awards or stock  appreciation
         rights.  Stock  options may be granted as  incentive  stock  options or
         non-qualified stock options.  Such options become exercisable at a rate
         of 20% per year over a five year  period  and expire ten years from the
         date of grant.

         In January 1995,  employees and directors who held outstanding  options
         to purchase  Old Knogo common  stock were  granted  substitute  options
         under the 1994 Plan to purchase an aggregate of 137,700 shares of Knogo
         N.A.  common  stock at prices  determined  pursuant  to the formula set
         forth in the Merger  Agreement.  All remaining  options granted in 1995
         and 1994 were issued at fair market value at the date of grant.

         In addition,  approximately 34,000 shares of the Company's common stock
         were issued to Old Knogo  employees who were not  transferred  to Knogo
         N.A. These shares were distributed in settlement of the cancellation of
         their Old Knogo stock options.

         Transactions  from  the date of  inception  of the  1994  Plan  through
         December 31, 1995 were as follows:

                                               Shares Under Option
                                      -----------------------------------
                                      Option Price             Number of
                                        Per Share               Shares
                                      ------------             ----------

Balance, February 28, 1994                                            --
Granted                                       $2.00              250,000
                                                                 -------
Balance, December 31, 1994                                       250,000
Granted                               $1.41 - $7.00              280,200
Exercised                             $1.41 - $1.92              (38,400)
Canceled                              $1.72 - $2.54              (67,000)
                                                                 -------
Balance, December 31, 1995                                       424,800
                                                                 =======



                  As of December 31, 1994 and 1995,  options were outstanding at
         a  weighted  average  exercise  price of $2.00  and  $2.27  per  share,
         respectively,  and expire at various dates beginning  December 6, 2004.
         As of December 31, 1995,  options for 261,800 shares were available for
         future grants and options for 127,500  shares were  exercisable.  As of
         December 31,  1995,  686,600  shares of common stock were  reserved for
         issuance in connection with the exercise of stock options.

                  In October 1995,  the  Financial  Accounting  Standards  Board
         ("FASB")  issued   Statement  No.  123,   "Accounting  For  Stock-Based
         Compensation,"  which must be adopted  by Knogo  N.A.  in fiscal  1996.
         Knogo N.A. has chosen not to implement the fair value based  accounting
         method  for  employee  stock  options,  but has  elected  to  disclose,
         commencing with its fiscal 1996 Annual Report, the pro forma net income
         and net income per share as if such method had been used to account for
         stock-based compensation cost as described in Statement No. 123.

         b.  Changes in  Authorized  Capital - In  November  1994,  the Board of
         Directors  authorized  an  increase  to the number of common  shares to
         10,000,000.  In November 1994, the Board approved the  authorization of
         3,000,000 shares of preferred  stock,  which may be issued by the Board
         on such terms and with such rights, preferences and designations as the
         Board may determine, without further stockholder action.






                                      F-28

<PAGE>

12.      INCOME TAXES

         The components of the Company's income tax provisions are as follows:

                             Year Ended      Ten Months Ended      Year Ended
                            February 28,       December 31,       December 31,
                               1994               1994               1995
                            -----------      ----------------     ------------
                                           (in thousands)
Current:
   Federal                    $ 396              $    --              $  51
   State                         --                   --                  9
   Puerto Rico                  390                  195                 (2)
                              -----              -------              -----
                                786                  195                 58
                              -----              -------              -----

Deferred:
   Federal                     $ --              $   --               $ --
   State                         --                  --                 --
   Puerto Rico                (147)                (220)                152
                              -----              -------              -----
                              (147)                (220)                152
                              -----              -------              -----
                              $ 639              $  (25)              $ 210
                              =====              =======              =====

<TABLE>


         The  reconciliation  between  total tax expense and the  expected  U.S.
         Federal income tax is as follows:

<CAPTION>


                                                    Year Ended          Ten Months Ended     Year Ended
                                                   February 28,           December 31,      December 31,
                                                       1994                   1994              1995
                                                   -----------          ----------------    ------------
                                                                          (in thousands)

<S>                                                  <C>                  <C>                  <C>

Expected tax expense (benefit) at 34%                $   259              $  (972)             $   660
Add/(deduct):
   U.S. losses producing no tax benefit                1,433                1,273                  --
   Benefit of nontaxable income of
     Puerto Rico subsidiary                           (1,324)                (366)                (510)
   Prior years' estimated tax adjustment                 271                   40                  --
   Other                                                 --                   --                    60
                                                     -------              -------              -------
                                                     $   639              $   (25)             $   210
                                                     =======              =======              =======
</TABLE>



                                      F-29


<PAGE>


<TABLE>


         Significant  components  of  deferred  tax assets and  liabilities  are
         comprised of:

<CAPTION>

                                                              Deferred Tax (Assets) Liabilities
                                                -----------------------------------------------------------
                                                February 28,            December 31,         December 31,
                                                    1994                    1994                1995
                                                ------------            ------------         ------------
                                                                       (in thousands)
<S>                                            <C>                    <C>                    <C>

Assets:
   Accounts receivable                         $  (507)               $  (293)               $  (372)
   Inventories                                    (832)                  (414)                  (523)
   Accrued liabilities                            (308)                  (470)                  (315)
   Property, plant and equipment                  --                     (851)                  (914)
   Security devices on lease                      (108)                   (90)                  --
   Intercompany transactions                       (54)                   (29)                    (9)
                                               -------                -------                -------
     Gross deferred tax assets                  (1,809)                (2,147)                (2,133)
     Less:  Valuation allowance                  1,496                  2,112                  2,101
                                               -------                -------                -------
                                                  (313)                   (35)                   (32)
                                               -------                -------                -------
Liabilities:
   Tollgate taxes                                  416                    171                    311
   Property, plant and equipment                   253                   --                     --
   Security devices on lease                      --                     --                        9
                                               -------                -------                -------
     Gross deferred tax liabilities                669                    171                    320
                                               -------                -------                -------
     Net deferred tax liability                $   356                $   136                $   288
                                               =======                =======                =======
</TABLE>



         The  increase in the  valuation  allowance  during the ten months ended
         December 31, 1994 was primarily  attributable to the revaluation of the
         corporate  headquarters  for book  purposes  offset  by a  decrease  in
         deferred  tax  assets  relating  to  the  inventory  reserves  and  the
         allowance  for  doubtful  accounts.   The  decrease  in  the  valuation
         allowance for the year ended  December 31, 1995 was due to the decrease
         in deferred tax assets for which  realization  was not more likely than
         not.

         The  Company's  Puerto  Rico  manufacturing  subsidiary  is exempt from
         Federal  income taxes under  Section 936 of the Internal  Revenue Code.
         Also, the Company was granted a partial income tax exemption  under the
         provisions of the Puerto Rico  Industrial  Incentives  Act of 1978 from
         the  payment of Puerto  Rico  taxes on income  derived  from  marketing
         certain products manufactured by the subsidiary. The grant provides for
         a 90%  exemption  from  Puerto Rico taxes  until  January 1, 2008.  The
         Company  provides  tollgate  taxes on the  earnings  of the Puerto Rico
         subsidiary which it intends to remit, in the form of a dividend, to the
         parent company based upon the applicable rates.

         The prior  years  income  tax  returns of Old  Knogo,  including  Knogo
         Caribe,   Inc.,   are  currently   being  examined  by  certain  taxing
         authorities.  The Company has  recorded  its  allocated  portion of the
         estimated  settlement costs for these matters.  Any further  liability,
         that may result upon the conclusion of these examinations will be borne
         by Sensormatic as a result of the Merger Agreement.


13.      COMMITMENTS AND CONTINGENCIES

         a.  Litigation  - The Company is a party to  litigation  arising in the
         normal course of business. Management believes the final disposition of
         such  matters  will  not  have  a  material   adverse   effect  on  the
         consolidated financial statements.


                                      F-30


<PAGE>


         b. Supply  Agreement - Knogo N.A.  entered  into a supply  agreement in
         which  Sensormatic is obligated to purchase products from Knogo N.A. in
         the amount of  $12,000,000  during 1995 and an  additional  $12,000,000
         during the ensuing 18 months.  Such  products are priced to yield Knogo
         N.A. a 35% gross  margin.  Included in accounts  receivable at December
         31, 1995 are  amounts due from  Sensormatic  of  $4,561,000  which were
         subsequently collected.

         c. License  Agreement - Knogo N.A. entered into a license  agreement in
         which  Knogo  N.A.  has the  exclusive  right to  manufacture  and sell
         existing  Knogo  products   within  the  Knogo  N.A.   territory,   and
         Sensormatic  has such right  elsewhere,  except  that  Knogo  N.A.  and
         Sensormatic  each have the right to develop  and market the  SuperStrip
         technology in the Knogo N.A. territory.

         d. Employment  Agreements - The Company and several key executives have
         entered into  employment  agreements  for terms of one to two years for
         which the Company has a minimum commitment of approximately $524,000.

         e. 401(k) Plan - In November 1994,  Knogo N.A.  adopted the Knogo North
         America Inc.  Retirement  Savings  401(k) Plan (the  "Plan").  The Plan
         permits eligible employees to make voluntary  contributions to a trust,
         up to a maximum of 15% of compensation, subject to certain limitations,
         with the Company making a matching  contribution  equal to a designated
         percentage of the eligible  employee's  deferral election.  The Company
         may also  contribute a discretionary  contribution,  subject to certain
         conditions,   as  defined  in  the  Plan.   The   Company   contributed
         approximately  $121,000  to the Plan for the year  ended  December  31,
         1995.

14.      SUBSEQUENT EVENTS

         a. Formation of Joint Venture - In January 1996, the Company acquired a
         controlling interest in K&M Converting Corp. ("KMCC").  KMCC is a newly
         established joint venture entered into with Marian Rubber Products Co.,
         Inc.  ("Marian").  KMCC will be the  exclusive  converter  of  magnetic
         material  into  disposable  targets or labels used in the Company's EAS
         systems.   The  Company   contributed  $15,000  in  cash,  $430,000  in
         inventory, and $49,000 in machinery to KMCC and issued 20,000 shares of
         Knogo N.A. common stock to Marian in exchange for 50.001% of KMCC.

         The  acquisition  will be accounted  for under the  purchase  method of
         accounting  and the  operating  results of KMCC will be included in the
         consolidated  operating  results of the Company  beginning in the first
         quarter of 1996.

         b. Merger with Video  Sentry  Corporation  - On October 10,  1996,  the
         Company  announced that it signed a merger  agreement with Video Sentry
         Corporation  ("Video Sentry") which will result in the Company becoming
         a wholly owned subsidiary of a new publicly traded entity called Sentry
         Technology   Corporation   ("Sentry").    Video   Sentry   Corporation,
         headquartered  in  Minneapolis,  Minnesota,  is a pioneer  in  patented
         traveling closed circuit television ("CCTV") surveillance systems.

         The merger  between  Knogo and Video  Sentry will enable the  resulting
         entity  to offer a more  comprehensive  line of  security  products  by
         combining Knogo's patented EAS technology and renowned customer service
         with Video Sentry's patented innovative CCTV systems technology.

         The merger  agreement  provides  for Sentry,  a  newly-formed  Delaware
         corporation, to issue 1 share of common stock for each 1 share of Video
         Sentry common stock  outstanding  at the effective  time of the merger.
         Sentry  will  issue 1 share  of  common  stock  and 1 share  of Class A
         Preferred   Stock  for  each  1.2022   shares  of  Knogo  common  stock
         outstanding.  As contemplated by the merger agreement, the Sentry Class
         A  Preferred  Stock  will  have a face  value of $5.00  per share and a
         cumulative  dividend  rate of 5.0%  (the  first  two years of which are
         paid-in-kind).  The  preferred  will be non  voting  and  subject  to a
         mandatory  redemption four years from the date of issuance and optional
         redemption  by  Sentry  at any time  after  one  year  


                                      F-31

<PAGE>


         from the date of issuance.  The redemption price will be equal to $5.00
         per  preferred  share  (plus  accrued  and unpaid  dividends  as of the
         redemption date) plus the amount,  if any, by which the market price of
         Sentry's common stock at the time of redemption  exceeds a hurdle price
         based on the price of Sentry  Common Stock one year after the Effective
         Time.  The minimum  hurdle  price is $5.00 per share and the maximum is
         $6.50. The preferred stock is non convertible, but the redemption price
         may,  in certain  circumstances,  be paid in common  stock at  Sentry's
         option.  Following  consummation of the merger,  it is anticipated that
         there will be  approximately  9.6 million shares of Sentry common stock
         (50.2%  owned by former Video  Sentry  shareholders  and 49.8% owned by
         former  Knogo  shareholders)  and 4.8 million  shares of Sentry Class A
         Preferred Stock outstanding, all owned by former Knogo shareholders.

         The merger  agreement  also provides for Sentry's Board of Directors to
         consist  initially  of two  representatives  each from Video Sentry and
         Knogo,  as well as one additional  director to be mutually  agreed upon
         between  the  parties.  Mr.  Nicolette  will be the CEO of Sentry.  Mr.
         Benson,  the  founder  and  president  of  Video  Sentry,  will be Vice
         President,  CCTV Products.  The Knogo and Video Sentry boards have both
         unanimously approved the transaction.

   
         It is expected that special shareholder meetings of both companies will
         be held in  early  1997.  Consummation  of the  merger  is  subject  to
         approval by the holders of a majority of the  outstanding  common stock
         of each company.  It is intended that the merger  qualify as a tax-free
         reorganization.
    

         c. Sale of Assets - On March 22, 1996,  the Company  completed the sale
         of certain  assets  (primarily  patents and  technology) of its library
         security systems business to Minnesota Mining and Manufacturing Company
         ("3M")  for a  purchase  price  of $3  million,  paid  at  closing.  In
         connection  with such  sale,  Knogo and 3M  entered  into an  agreement
         pursuant to which the Company  has become a  distributor  of certain of
         3M's  library  systems  products for an initial term of three years and
         has  agreed  not to  compete  with 3M in the sale of  security  systems
         products  (other  than  closed  circuit  video  systems) in the library
         market   except   as   otherwise   contemplated   by  the   transaction
         documentation.  The parties  also  settled  certain  patent  litigation
         between them.

         The impact of the  transaction  resulted  in an  increase in cash of $3
         million  and  pretax  tax gain of  approximately  $2.5  million  in the
         quarter ended March 31, 1996.  The impact on the  Company's  historical
         revenues  and net  income  from the  sale of  products  covered  by the
         patents and related technology sold is not material.

         d.  Sale-Leaseback  - On December  24,  1996,  the Company  completed a
         sale-leaseback transaction on the Company's corporate headquarters. The
         Company  received  net  proceeds  of  approximately   $4,500,000  which
         approximates  the carrying  value of the land and  building.  The lease
         covers a period of 20 years with quarterly  lease payments of $131,000.
         The lease agreement  allows for an increase in lease payments for years
         4-20 based on a formula tied to the Consumer Price Index.


                                      F-32



<PAGE>


<TABLE>

SCHEDULE II

KNOGO NORTH AMERICA INC. AND SUBSIDIARIES
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
- --------------------------------------------------------------------------------
(in thousands)

<CAPTION>


                   COLUMN A               COLUMN B              COLUMN C                  COLUMN D              COLUMN E
                   --------               --------     ---------------------------        --------              --------   
                                                              Additions
                                                       ---------------------------
                                                                       Charged to
                                         Balance at     Charged to       Other                                   Balance
                                        beginning of     Cost and       Accounts         Deductions             at end of
       Descriptions                        Period        Expenses     - describe         - describe              Period
- -------------------------------------   ------------    ----------    ------------       ----------             ----------
<S>                                          <C>          <C>             <C>          <C>                     <C>


Year ended February 28, 1994:
   Allowance for doubtful accounts           $1,234       $  666          $51(1)       $  460(2)               $1,491
                                             ------       ------          ------       ---------               ------
   Allowance for uncollectible minimum                                                                      
     lease payments                             193          (65)            --             --                    128
                                             ------       ------          ------       ---------               ------
   Reserve for excess and                                                                                   
     obsolete inventory                       2,461          477             --           260(2)                2,678
                                             ------       ------          ------       ---------               ------

Ten months ended                                                                                            
   December 31, 1994:                                                                     526(3)                     
                                                                                       ---------                        
   Allowance for doubtful accounts            1,491          661           16(1)          780(2)                  862
                                             ------       ------          ------       ---------               ------
   Allowance for uncollectible                                                                              
     minimum lease payments                     128          (17)            --             --                    111
                                             ------       ------          ------       ---------               ------
   Reserve for excess and                                                                                   
     obsolete inventory                       2,678          319             --         1,654(2)                1,343
                                             ------       ------          ------       ---------               ------
                                                                                                            
Year ended December 31, 1995:                                                                               
   Allowance for doubtful accounts              862          352           34(1)          317(2)                  931
                                             ------       ------          ------       ---------               ------
   Allowance for uncollectible                                                                              
     minimum lease payments                     111           48             --             --                    159
                                             ------       ------          ------       ---------               ------
   Reserve for excess and                                                                                   
     obsolete inventory                      $1,343       $  394             --        $  296(2)               $1,441
                                             ------       ------          ------       ---------               ------
<FN>                                                                       
- ---------------------------------------
(1)      Recoveries of accounts written off.
(2)      Amounts written off.                                                
(3)      Reserve charged to accrued liabilities.                             
</FN>                                                                    
</TABLE>
     
                                      F-33
                                   
<PAGE>

   
                                                                      APPENDIX A
    

<PAGE>



                              AMENDED AND RESTATED

                              AGREEMENT AND PLAN OF

                            REORGANIZATION AND MERGER

                                  by and among

                            VIDEO SENTRY CORPORATION,

                            KNOGO NORTH AMERICA INC.,

                          SENTRY TECHNOLOGY CORPORATION

                               VIKING MERGER CORP.

                                       and

                               STRIP MERGER CORP.


                          Dated as of November 27, 1996




<PAGE>



                                TABLE OF CONTENTS

                                                                          Page

ARTICLE I             SENTRY...............................................  2
         1.1          Certificate of Incorporation and Bylaws..............  2
         1.2          Directors and Officers...............................  2

ARTICLE II            THE MERGERS..........................................  2
         2.1          The VIDEO Merger.....................................  2
         2.2          VIDEO Effective Time.................................  2
         2.3          The KNOGO Merger.....................................  3
         2.4          KNOGO Effective Time.................................  3
         2.5          Certificates of Incorporation and Bylaws.............  3
         2.6          Directors and Officers...............................  4
         2.7          Effective Time.......................................  4
         2.8          Closing..............................................  4

ARTICLE III           CONVERSION OF SHARES.................................  4
         3.1          VIDEO Stock..........................................  4
         3.2          KNOGO Stock..........................................  5
         3.3          SENTRY Stock.........................................  6
         3.4          VMC Stock............................................  6
         3.5          SMC Stock............................................  6
         3.6          Exchange of Certificates.............................  6
         3.7          Adjustment of Merger Consideration................... 11
         3.8          VIDEO Stock Options.................................. 11
         3.9          KNOGO Stock Options.................................. 12
         3.10         Stockholder Approval................................. 12

ARTICLE IV            REPRESENTATIONS AND WARRANTIES OF KNOGO.............. 13
         4.1          Organization and Qualification....................... 13
         4.2          Capitalization....................................... 13
         4.3          Authorization and Validity of Agreement.............. 14
         4.4          Consents and Approvals............................... 15
         4.5          No Violation......................................... 15
         4.6          SEC Reports; Financial Statements.................... 16
         4.7          Joint Proxy Statement/Prospectus..................... 17
         4.8          Compliance with Law.................................. 17
         4.9          Absence of Certain Changes........................... 18
         4.10         No Undisclosed Liabilities........................... 18
         4.11         Litigation........................................... 18
         4.12         Employee Benefit Matters............................. 18
         4.13         Taxes................................................ 19
         4.14         Intellectual Property................................ 20
         4.15         Labor Matters........................................ 20
         4.16         Brokers and Finders.................................. 20
         4.17         Opinion of Financial Advisor......................... 20
         4.18         Section 351/Reorganization Treatment................. 20
         4.19         VIDEO Shares Ownership............................... 20






                                        i

<PAGE>


                                                                          Page

ARTICLE V             REPRESENTATIONS AND WARRANTIES OF VIDEO,
                      SENTRY, VMC AND SMC.................................. 21
         5.1          Organization and Qualification....................... 21
         5.2          Capitalization....................................... 21
         5.3          Authorization and Validity of Agreement.............. 24
         5.4          Consents and Approvals............................... 24
         5.5          No Violation......................................... 25
         5.6          SEC Reports; Financial Statements.................... 25
         5.7          Joint Proxy Statement/Prospectus..................... 26
         5.8          Compliance with Law.................................. 26
         5.9          Absence of Certain Changes........................... 27
         5.10         No Undisclosed Liabilities........................... 27
         5.11         Litigation........................................... 27
         5.12         Employee Benefit Matters............................. 28
         5.13         Taxes................................................ 28
         5.14         Intellectual Property................................ 29
         5.15         Labor Matters........................................ 29
         5.16         Brokers and Finders.................................. 29
         5.17         Opinion of Financial Advisor......................... 29
         5.18         Section 351/Reorganization Treatment................. 29
         5.19         KNOGO Shares Ownership............................... 30
         5.20         Operations of SENTRY, VMC and SMC.................... 30

ARTICLE VI            COVENANTS............................................ 30
         6.1          Conduct of the Business of KNOGO and VIDEO
                      Pending the Reorganization........................... 30
         6.2          Access; Confidentiality.............................. 32
         6.3          Meetings of Stockholders............................. 32
         6.4          Reasonable Efforts................................... 32
         6.5          Public Announcements................................. 33
         6.6          Acquisition Proposals................................ 33
         6.7          Registration Statement and Joint Proxy
                      Statement/Prospectus................................. 34
         6.8          Listing Application.................................. 35
         6.9          Affiliate Letters.................................... 35
         6.10         D&O Indemnification and Insurance.................... 36
         6.11         Employee Benefits.................................... 37
         6.12         Fees and Expenses.................................... 38
         6.13         Cancellation of SENTRY Common Stock.................. 39

ARTICLE VII           CLOSING CONDITIONS................................... 39
         7.1          Conditions to Obligations of Each Party to
                      Effect the Reorganization............................ 39
         7.2          Conditions Precedent to the Obligations of
                      KNOGO................................................ 40
         7.3          Conditions Precedent to the Obligations of
                      VIDEO, SENTRY, VMC and SMC........................... 41

ARTICLE VIII TERMINATION................................................... 42
         8.1          Termination.......................................... 42





                                       ii

<PAGE>


                                                                          Page
         8.2          Effect of Termination................................ 43

ARTICLE IX            MISCELLANEOUS........................................ 44
         9.1          Nonsurvival of Representations, Warranties and
                      Covenants............................................ 44
         9.2          Notices.............................................. 44
         9.3          Certain Definitions.................................. 45
         9.4          Entire Agreement..................................... 46
         9.5          Assignment; Binding Effect........................... 46
         9.6          Amendments........................................... 47
         9.7          Waiver............................................... 47
         9.8          Validity............................................. 47
         9.9          Captions............................................. 47
         9.10         Counterparts......................................... 47
         9.11         Governing Law........................................ 47








                                       iii

<PAGE>



                              AMENDED AND RESTATED

                 AGREEMENT AND PLAN OF REORGANIZATION AND MERGER


                  THIS AMENDED AND RESTATED AGREEMENT AND PLAN OF REORGANIZATION
AND MERGER,  dated as of November 27, 1996,  (the  "Agreement")  is by and among
VIDEO SENTRY CORPORATION, a Minnesota corporation ("VIDEO"), KNOGO NORTH AMERICA
INC.,  a  Delaware  corporation  ("KNOGO"),  SENTRY  TECHNOLOGY  CORPORATION,  a
Delaware corporation  ("SENTRY"),  VIKING MERGER CORP., a Minnesota  corporation
and a wholly  owned  subsidiary  of  SENTRY  formed  solely  to  effectuate  the
transactions  contemplated  hereby  ("VMC"),  and STRIP MERGER CORP., a Delaware
corporation  and wholly owned  subsidiary  of SENTRY formed solely to effectuate
the transactions contemplated hereby ("SMC").

                                    RECITALS

                  WHEREAS,  the Boards of Directors of VIDEO and KNOGO each have
approved,  and deem it advisable and in the best  interests of their  respective
companies and stockholders to consummate the reorganization and mergers provided
for herein,  pursuant to which  SENTRY will  acquire all of the common  stock of
each of VIDEO and KNOGO through mergers of VMC and SMC,  subsidiaries of SENTRY,
with and into each of VIDEO and KNOGO, respectively, and accordingly have agreed
to effect the  Reorganization  (as  defined in Section 2.3 below) upon the terms
and subject to the conditions set forth herein;

                  WHEREAS, it is intended that, for Federal income tax purposes,
(i) the VIDEO Merger (as hereinafter  defined) qualify as a reorganization under
the provisions of Section 368(a) of the United States  Internal  Revenue Code of
1986,  as amended,  and the  regulations  thereunder  (the "Code")  and/or as an
exchange under the provisions of Section 351 of the Code and (ii) that the KNOGO
Merger (as hereinafter  defined)  qualify as an exchange under the provisions of
Section 351 of the Code;

                  WHEREAS,  KNOGO,  VIDEO,  SENTRY,  VMC and SMC  desire to make
certain representations, warranties, covenants and agreements in connection with
this Agreement; and

                  WHEREAS,  on October 10, 1996, the above-named parties entered
into that certain Agreement and Plan of Reorganization  and Merger (the "Initial
Merger  Agreement"),  and the parties thereto and hereto now desire to amend and
restate the Initial Merger Agreement as provided herein.



<PAGE>



                  NOW,  THEREFORE,  in consideration of the foregoing and of the
respective  representations,  warranties,  covenants and agreements set forth in
this Agreement, the parties hereto hereby agree as follows:


                                    AGREEMENT

                                    ARTICLE I

                                     SENTRY

                  1.1 Certificate of Incorporation  and Bylaws. At the Effective
Time (as defined in Section 2.7),  the  certificate of  incorporation  of SENTRY
(the  "SENTRY  Certificate  of  Incorporation")  shall be in form  substantially
similar to Exhibit A  attached  hereto.  At the  Effective  Time,  the Bylaws of
SENTRY (the "SENTRY  Bylaws") shall be in form as mutually  agreed upon by VIDEO
and KNOGO.

                  1.2 Directors and Officers. At the Effective Time, the initial
directors  of  SENTRY  shall be as set forth in  Exhibit B hereto,  each to hold
office in accordance  with the SENTRY  Certificate of  Incorporation  and SENTRY
Bylaws until such directors'  successors are elected and qualified.  The initial
officers of SENTRY  shall be as set forth in Exhibit B hereto and shall serve at
the discretion of its Board of Directors in accordance with the SENTRY Bylaws.


                                   ARTICLE II

                              THE MERGERS; CLOSING

                  2.1 The  VIDEO  Merger.  Upon the  terms  and  subject  to the
conditions of this Agreement and in accordance with applicable provisions of the
Minnesota Business Corporation Act (the "Minnesota Act"), at the VIDEO Effective
Time (as defined in Section 2.2 below),  VMC shall be merged with and into VIDEO
(the "VIDEO Merger").  As a result of the VIDEO Merger,  the separate  corporate
existence  of VMC  shall  cease  and  VIDEO  shall  continue  as  the  surviving
corporation of the VIDEO Merger (the "VIDEO Surviving Corporation").

                  2.2 VIDEO Effective Time. As promptly as practicable after the
satisfaction  or, if permissible,  waiver of the conditions set forth in Article
VII,  the parties  hereto will cause an  articles  of merger (the  "Articles  of
Merger") to be executed  and filed with the  Secretary  of State of the State of
Minnesota in accordance  with the  Minnesota  Act. The VIDEO Merger shall become
effective at such time as the Articles of Merger are filed with the Secretary of
State of the State of Minnesota in accordance with the Minnesota


                                        2

<PAGE>



Act,  or at such later time as may be  specified  in the  Articles  of Merger in
accordance  with  applicable  law (such time and date herein  referred to as the
"VIDEO  Effective  Time").  At the VIDEO  Effective Time, the VIDEO Merger shall
have the effects set forth in the applicable provisions of the Minnesota Act.

                  2.3 The  KNOGO  Merger.  Upon the  terms  and  subject  to the
conditions of this Agreement and in accordance with applicable provisions of the
Delaware General  Corporation Law (the "DGCL"),  at the KNOGO Effective Time (as
defined  in Section  2.4  below),  SMC shall be merged  with and into KNOGO (the
"KNOGO  Merger")(together  with the VIDEO Merger,  the  "Reorganization").  As a
result of the KNOGO Merger, the separate corporate  existence of SMC shall cease
and KNOGO shall  continue as the surviving  corporation of the KNOGO Merger (the
"KNOGO Surviving Corporation").

                  2.4 KNOGO Effective Time. As promptly as practicable after the
satisfaction  or, if permissible,  waiver of the conditions set forth in Article
VII, the parties hereto will cause a certificate of merger (the  "Certificate of
Merger") to be executed  and filed with the  Secretary  of State of the State of
Delaware in accordance with the DGCL. The KNOGO Merger shall become effective at
such time as the  Certificate  of Merger is filed with the Secretary of State of
the State of Delaware in accordance  with the DGCL, or at such later time as may
be specified in the  Certificate  of Merger in accordance  with  applicable  law
(such time and date herein referred to as the "KNOGO  Effective  Time").  At the
KNOGO  Effective  Time, the KNOGO Merger shall have the effects set forth in the
applicable provisions of the DGCL.

                  2.5  Certificates  of  Incorporation   and  Bylaws.   (a)  The
Certificate of Incorporation of VMC as in effect  immediately prior to the VIDEO
Effective Time (the "VMC Certificate") shall be the Certificate of Incorporation
of the VIDEO Surviving Corporation immediately after the VIDEO Effective Time.

                  (b)  The  Certificate  of  Incorporation  of SMC as in  effect
immediately prior to the KNOGO Effective Time (the "SMC  Certificate")  shall be
the Certificate of Incorporation of the KNOGO Surviving Corporation  immediately
after the KNOGO Effective Time.

                  (c) The  Bylaws of VMC as in effect  immediately  prior to the
VIDEO  Effective  Time  (the  "VMC  Bylaws")  shall be the  Bylaws  of the VIDEO
Surviving Corporation immediately after the VIDEO Effective Time.

                  (d) The  Bylaws of SMC as in effect  immediately  prior to the
KNOGO  Effective  Time  (the  "SMC  Bylaws")  shall be the  Bylaws  of the KNOGO
Surviving Corporation immediately after the KNOGO Effective Time.



                                        3

<PAGE>



                  2.6      Directors and Officers.   (a)  The  directors  of VMC
immediately  prior to the VIDEO  Effective  Time shall be the  directors  of the
VIDEO  Surviving  Corporation  as of the VIDEO  Effective  Time and until  their
successors are duly appointed or elected in accordance with applicable law.

                  (b)  The  directors  of SMC  immediately  prior  to the  KNOGO
Effective Time shall be the directors of the KNOGO  Surviving  Corporation as of
the KNOGO  Effective  Time and until  their  successors  are duly  appointed  or
elected in accordance with applicable law.

                  (c) The  officers  of VIDEO  immediately  prior  to the  VIDEO
Effective  Time shall be the officers of the VIDEO  Surviving  Corporation as of
the VIDEO Effective Time until their successors are duly appointed or elected in
accordance with applicable law.

                  (d) The  officers  of KNOGO  immediately  prior  to the  KNOGO
Effective  Time shall be the officers of the KNOGO  Surviving  Corporation as of
the KNOGO Effective Time until their successors are duly appointed or elected in
accordance with applicable law.

                  2.7 Effective Time. The term  "Effective  Time" shall mean the
time and date  which is (A) the later of (i) the VIDEO  Effective  Time and (ii)
the KNOGO Effective Time, or (B) such other time and date as may be agreed to in
writing by VIDEO and KNOGO. The parties hereto agree that each will use its best
efforts to ensure that the VIDEO  Effective  Time and the KNOGO  Effective  Time
occur upon the same date and at the same time.

                  2.8 Closing.  Unless this Agreement shall have been terminated
pursuant to Article  VIII and subject to the  satisfaction  or, if  permissible,
waiver of the conditions set forth in Article VII, the consummation of the VIDEO
Merger, the KNOGO Merger, and the other  transactions  contemplated  hereby (the
"Closing") shall take place at the offices of Dewey  Ballantine,  1301 Avenue of
the Americas, New York, New York 10019, as promptly as practicable following the
satisfaction  or, if permissible,  waiver of the conditions set forth in Article
VII,  unless  another  place,  date or time is agreed to in writing by VIDEO and
KNOGO.


                                   ARTICLE III

                              CONVERSION OF SHARES

                  3.1 VIDEO Stock. At the VIDEO Effective Time, by virtue of the
VIDEO Merger and without any action on the part of any of the parties  hereto or
the holders of any shares of the capital stock of SENTRY,  VIDEO OR KNOGO,  each
share of VIDEO  common  stock,  par value $0.01 per share (the "VIDEO  Shares"),
which is issued and  outstanding  immediately  prior to the VIDEO Effective Time
shall be





                                        4

<PAGE>



converted into and represent the right to receive one share of common stock, par
value $0.001 per share,  of SENTRY  ("SENTRY  Common  Stock") (the "VIDEO Merger
Consideration").  All such VIDEO Shares shall no longer be outstanding and shall
automatically  be canceled and  extinguished  and shall cease to exist, and each
certificate  which  immediately  prior to the VIDEO Effective Time evidenced any
such VIDEO Shares ("VIDEO Certificates") shall thereafter represent the right to
receive  (without  interest),  upon  surrender  of  such  VIDEO  Certificate  in
accordance  with the  provisions of Section 3.6, the VIDEO Merger  Consideration
multiplied  by the number of VIDEO Shares  evidenced by such VIDEO  Certificate.
The holders of VIDEO Certificates previously evidencing VIDEO Shares outstanding
immediately  prior to the VIDEO  Effective  Time shall  cease to have any rights
with respect thereto (including,  without  limitation,  any rights to vote or to
receive dividends and distributions in respect of such VIDEO Shares),  except as
otherwise  provided  herein or by law. At the VIDEO  Effective  Time, each VIDEO
Share held in VIDEO's treasury immediately prior to the Effective Time shall, by
virtue of the VIDEO Merger, be canceled and retired and cease to exist,  without
any conversion thereof.  All other classes of VIDEO stock held in treasury shall
also be canceled.

                  3.2 KNOGO Stock. At the KNOGO Effective Time, by virtue of the
KNOGO Merger and without any action on the part of any of the parties  hereto or
the holders of any shares of the capital stock of SENTRY,  VIDEO OR KNOGO,  each
1.2022  shares of KNOGO  common  stock,  par value  $0.01 per share (the  "KNOGO
Shares"),  which is  issued  and  outstanding  immediately  prior  to the  KNOGO
Effective  Time shall be converted  into and  represent the right to receive one
share of SENTRY Common Stock (the "KNOGO Common Stock Consideration"),  plus one
share of preferred stock, par value $0.001 per share, of SENTRY ("SENTRY Class A
Preferred Stock"; such SENTRY Class A Preferred Stock having the terms set forth
in  Exhibit  A  attached   hereto)   (together   with  the  KNOGO  Common  Stock
Consideration,  the  "KNOGO  Merger  Consideration"  and with the  VIDEO  Merger
Consideration,  collectively, the "Merger Consideration"). All such KNOGO Shares
shall  no  longer  be  outstanding  and  shall  automatically  be  canceled  and
extinguished and shall cease to exist, and each  certificate  which  immediately
prior to the KNOGO  Effective  Time  evidenced  any such  KNOGO  Shares  ("KNOGO
Certificates")   shall  thereafter  represent  the  right  to  receive  (without
interest),  upon  surrender of such KNOGO  Certificate  in  accordance  with the
provisions  of Section  3.6, the KNOGO Merger  Consideration  multiplied  by the
number of KNOGO Shares evidenced by such KNOGO Certificate. The holders of KNOGO
Certificates previously evidencing KNOGO Shares outstanding immediately prior to
the KNOGO  Effective  Time shall cease to have any rights with  respect  thereto
(including,  without limitation,  any rights to vote or to receive dividends and
distributions  in respect of such KNOGO  Shares),  except as otherwise  provided
herein or by law. At the KNOGO  Effective Time, each KNOGO Share held in KNOGO's
treasury immediately prior to the KNOGO Effective Time shall, by virtue of



                                        5

<PAGE>



the KNOGO  Merger,  be  canceled  and  retired  and cease to exist,  without any
conversion thereof. All other classes of KNOGO stock held in treasury shall also
be canceled.

                  3.3 SENTRY Stock.  At the Effective Time, each share of SENTRY
Common Stock,  which  immediately prior to the Effective Time is owned by VIDEO,
shall be canceled and extinguished and shall cease to exist and no consideration
shall be delivered with respect thereto.

                  3.4 VMC Stock. Each share of common stock, par value $.001 per
share,  of VMC (the "VMC Common  Stock")  outstanding  immediately  prior to the
VIDEO  Effective  Time  shall,  by virtue of the VIDEO  Merger and  without  any
further action by the holder thereof,  be converted into and become one share of
common stock, par value $.001 per share, of the VIDEO Surviving Corporation (the
"VIDEO Surviving  Corporation Common Stock"). Each certificate which immediately
prior to the VIDEO Effective Time represented  outstanding  shares of VMC Common
Stock shall,  on and after the VIDEO  Effective Time, be deemed for all purposes
to represent the number of shares of VIDEO  Surviving  Corporation  Common Stock
into which the shares of VMC Common Stock  represented by such certificate shall
have been converted pursuant to this Section 3.4.

                  3.5 SMC Stock. Each share of common stock, par value $.001 per
share,  of SMC (the "SMC Common  Stock")  outstanding  immediately  prior to the
KNOGO  Effective  Time  shall,  by virtue of the KNOGO  Merger and  without  any
further action by the holder thereof,  be converted into and become one share of
common stock, par value $.001 per share, of the KNOGO Surviving Corporation (the
"KNOGO Surviving  Corporation Common Stock"). Each certificate which immediately
prior to the KNOGO Effective Time represented  outstanding  shares of SMC Common
Stock shall,  on and after the KNOGO  Effective Time, be deemed for all purposes
to represent the number of shares of KNOGO  Surviving  Corporation  Common Stock
into which the shares of SMC Common Stock  represented by such certificate shall
have been converted pursuant to this Section 3.5.

                  3.6 Exchange of  Certificates.  (a) As of the Effective  Time,
SENTRY shall  deposit,  or shall cause to be deposited,  with an exchange  agent
mutually selected by VIDEO and KNOGO (the "Exchange Agent"),  for the benefit of
the holders of VIDEO Shares and KNOGO Shares,  for exchange in  accordance  with
this Article III,  certificates  representing  the shares of SENTRY Common Stock
and SENTRY  Class A  Preferred  Stock  (such  certificates  for shares of SENTRY
Common Stock and SENTRY Class A Preferred Stock,  together with any dividends or
distributions  with respect thereto (relating to record dates for such dividends
or distributions after the Effective Time), being hereinafter referred to as the
"Exchange  Fund") to be issued pursuant to this Article III and paid pursuant to
this Section 3.6 in exchange for outstanding VIDEO Shares and KNOGO Shares.





                                        6

<PAGE>




                  (b) Promptly after the Effective Time,  SENTRY shall cause the
Exchange  Agent to mail to each holder of record of VIDEO Shares (i) a letter of
transmittal  which shall  specify that delivery  shall be effected,  and risk of
loss and title to such VIDEO Shares shall pass,  only upon delivery of the VIDEO
Certificates  representing  such VIDEO  Shares to the  Exchange  Agent and which
shall be in such form and have such other  provisions  as SENTRY may  reasonably
specify and (ii)  instructions  for use in effecting the surrender of such VIDEO
Certificates in exchange for certificates  representing  shares of SENTRY Common
Stock  and  cash  in  lieu  of  fractional  shares.  Upon  surrender  of a VIDEO
Certificate for  cancellation to the Exchange Agent together with such letter of
transmittal,  duly executed and completed in  accordance  with the  instructions
thereto,  the holder of VIDEO Shares represented by such VIDEO Certificate shall
be entitled to receive in exchange therefor (x) a certificate  representing that
number of whole shares of SENTRY Common Stock and (y) a check  representing  the
amount of cash in lieu of fractional  shares (in accordance  with Section 3.6(f)
below),  if any, and unpaid  dividends  and  distributions,  if any,  which such
holder has the right to receive in respect of the VIDEO Certificate  surrendered
pursuant to the  provisions  of this  Article III,  after  giving  effect to any
required  withholding  tax,  and  the  VIDEO  Shares  represented  by the  VIDEO
Certificate so surrendered shall forthwith be canceled. No interest will be paid
or accrued on the cash in lieu of  fractional  shares and unpaid  dividends  and
distributions,  if any,  payable to holders of VIDEO  Shares.  In the event of a
transfer of ownership of VIDEO  Shares which is not  registered  in the transfer
records of VIDEO,  a  certificate  representing  the proper  number of shares of
SENTRY  Common  Stock,  together with a check for the cash to be paid in lieu of
fractional  shares (in accordance  with Section 3.6(f) below),  may be issued to
such a transferee  if the VIDEO  Certificate  representing  such VIDEO Shares is
presented  to the  Exchange  Agent,  accompanied  by all  documents  required to
evidence and effect such  transfer  and to evidence  that any  applicable  stock
transfer taxes have been paid.

                  (c) Promptly after the Effective Time,  SENTRY shall cause the
Exchange  Agent to mail to each holder of record of KNOGO Shares (i) a letter of
transmittal  which shall  specify that delivery  shall be effected,  and risk of
loss and title to such KNOGO Shares shall pass,  only upon delivery of the KNOGO
Certificates  representing  such KNOGO  Shares to the  Exchange  Agent and which
shall be in such form and have such other  provisions  as SENTRY may  reasonably
specify and (ii)  instructions  for use in effecting the surrender of such KNOGO
Certificates in exchange for certificates  representing  shares of SENTRY Common
Stock,  SENTRY Class A Preferred  Stock and cash in lieu of  fractional  shares.
Upon surrender of a KNOGO  Certificate  for  cancellation  to the Exchange Agent
together  with such  letter of  transmittal,  duly  executed  and  completed  in
accordance with the instructions thereto, the holder of KNOGO Shares represented
by such KNOGO Certificate





                                        7

<PAGE>



shall be entitled to receive in exchange therefor (x) a certificate representing
that  number  of  whole  shares  of  SENTRY  Common  Stock,  (y)  a  certificate
representing  that number of whole shares of SENTRY Class A Preferred Stock, and
(z) a check  representing  the amount of cash in lieu of  fractional  shares (in
accordance  with  Section  3.6(f)  below),  if any,  and  unpaid  dividends  and
distributions,  if any, which such holder has the right to receive in respect of
the KNOGO  Certificate  surrendered  pursuant to the  provisions of this Article
III, after giving effect to any required  withholding  tax, and the KNOGO Shares
represented by the KNOGO Certificate so surrendered shall forthwith be canceled.
No interest will be paid or accrued on the cash in lieu of fractional shares and
unpaid dividends and distributions,  if any, payable to holders of KNOGO Shares.
In the event of a transfer of ownership of KNOGO Shares which is not  registered
in the transfer  records of KNOGO, a certificate  representing the proper number
of shares of SENTRY Common Stock and SENTRY Class A Preferred  Stock and a check
for the cash to be paid in lieu of fractional shares (in accordance with Section
3.6(f)  below),  may be issued  to such a  transferee  if the KNOGO  Certificate
representing  such KNOGO Shares is presented to the Exchange Agent,  accompanied
by all  documents  required to evidence and effect such transfer and to evidence
that any applicable stock transfer taxes have been paid.

                  (d) Notwithstanding any other provisions of this Agreement, no
dividends or other  distributions  declared  after the Effective  Time on SENTRY
Common Stock or SENTRY Class A Preferred Stock shall be paid with respect to any
shares  represented by a VIDEO or KNOGO  Certificate,  as the case may be, until
such Certificate is surrendered for exchange as provided herein.  Subject to the
effect  of  applicable  laws,  following  surrender  of any such  VIDEO or KNOGO
Certificate,  there shall be paid to the holder of the certificates representing
whole shares of SENTRY Common Stock or SENTRY Class A Preferred  Stock issued in
exchange  therefor,  without  interest,  (i) at the time of such surrender,  the
amount  of  dividends  or other  distributions  with a  record  date  after  the
Effective Time  theretofore  payable with respect to such whole shares of SENTRY
Common Stock or SENTRY Class A Preferred  Stock and not paid, less the amount of
any withholding taxes which may be required thereon, and (ii) at the appropriate
payment date, the amount of dividends or other  distributions with a record date
after the Effective Time but prior to surrender and a payment date subsequent to
surrender  payable with  respect to such whole shares of SENTRY  Common Stock or
SENTRY Class A Preferred Stock,  less the amount of any withholding  taxes which
may be required thereon.

                  (e) At or after the VIDEO  Effective  Time,  there shall be no
transfers  on the stock  transfer  books of VIDEO of the VIDEO Shares which were
outstanding immediately prior to the VIDEO Effective Time. At or after the KNOGO
Effective Time, there shall be no transfers on the stock transfer books of KNOGO
of the KNOGO Shares which were outstanding immediately prior to the KNOGO





                                        8

<PAGE>



Effective Time. If, after the Effective Time,  VIDEO or KNOGO  Certificates  are
presented to SENTRY,  they shall be canceled and exchanged for  certificates for
shares of SENTRY Common Stock (and SENTRY Class A Preferred Stock in the case of
KNOGO Shares) and cash in lieu of fractional  shares (in accordance with Section
3.6(f) below), if any, deliverable in respect thereof pursuant to this Agreement
in accordance  with the procedures  set forth in this Article III.  Certificates
surrendered  for exchange by any person  constituting an "affiliate" of KNOGO or
VIDEO for purposes of Rule 145(c) under the  Securities  Act of 1933, as amended
(the  "Securities  Act"),  shall not be  exchanged  until  SENTRY has received a
written agreement from such person as provided in Section 6.9.

                  (f) No  fractional  shares  of SENTRY  Common  Stock or SENTRY
Class A Preferred Stock shall be issued pursuant hereto. As promptly as possible
following the Effective  Time, the Exchange Agent shall  determine the excess of
(i)(A)  the  number of full  shares  of SENTRY  Common  Stock  delivered  to the
Exchange Agent by SENTRY  pursuant to Section 3.6(a) over (B) the number of full
shares of SENTRY Common Stock to be  distributed  to the holders of VIDEO Shares
and KNOGO  Shares  pursuant to Sections  3.6(b) and 3.6(c)  (such  excess  being
herein  referred to as the "Excess  Common  Shares"),  and (ii)(A) the number of
full shares of SENTRY Class A Preferred Stock delivered to the Exchange Agent by
SENTRY  pursuant to Section  3.6(a) over (B) the number of full shares of SENTRY
Class A  Preferred  Stock to be  distributed  to the  holders  of  KNOGO  Shares
pursuant to Sections 3.6(c) (such excess being herein referred to as the "Excess
Preferred  Shares").  As soon  after  the  Effective  Date as  practicable,  the
Exchange Agent, as agent for the holders of SENTRY Common Stock and SENTRY Class
A Preferred  Stock,  shall sell the Excess  Common  Shares and Excess  Preferred
Shares at the then  prevailing  prices on the  NASDAQ  Stock  Market's  National
Market ("NASDAQ"),  or such other national securities exchange as is applicable,
through  one or more  member  firms  of  NASDAQ,  or other  national  securities
exchange,  as the case may be, in round lots to the extent  practicable.  SENTRY
shall pay all commissions,  transfer taxes and other out-of-pocket  transactions
costs, including the expenses and compensation of the Exchange Agent incurred in
connection  with such sale of the Excess  Common  Shares  and  Excess  Preferred
Shares.  Until the proceeds of such sale or sales have been  distributed  to the
holders of SENTRY  Common  Stock or SENTRY Class A Preferred  Stock  entitled to
receipt of such  proceeds,  the Exchange Agent shall hold such proceeds in trust
for those holders of SENTRY Common Stock and SENTRY Class A Preferred Stock. The
Exchange Agent shall  determine the portion of the proceeds from the sale of (i)
the Excess  Common Shares (the "Excess  Common  Shares  Proceeds") to which each
holder of SENTRY Common Stock is entitled,  if any, by multiplying the amount of
the Excess Common Shares  Proceeds by a fraction,  the numerator of which is the
amount of the  fractional  share  interest to which such holder of SENTRY Common
Stock is entitled, and the denominator of which is the aggregate





                                        9

<PAGE>



amount of  fractional  share  interests  to which all of the  holders  of SENTRY
Common Stock are  entitled,  and (ii) the Excess  Preferred  Shares (the "Excess
Preferred  Shares  Proceeds")  to which each holder of SENTRY  Class A Preferred
Stock is entitled,  if any, by  multiplying  the amount of the Excess  Preferred
Shares  Proceeds  by a  fraction,  the  numerator  of which is the amount of the
fractional share interest to which such holder of SENTRY Class A Preferred Stock
is entitled,  and the denominator of which is the aggregate amount of fractional
share  interests to which all of the holders of SENTRY  Class A Preferred  Stock
are entitled.  As soon as practicable after the sale of the Excess Common Shares
and the Excess Preferred Shares and the  determination of the amount of cash, if
any,  to be paid to each  holder  of SENTRY  Common  Stock  and  SENTRY  Class A
Preferred Stock in lieu of any fractional  share  interests,  the Exchange Agent
shall  distribute  such amounts to the holders of SENTRY Common Stock and SENTRY
Class A Preferred  Stock  entitled  thereto and who have  theretofore  delivered
VIDEO  Certificates or KNOGO Certificates for SENTRY Company Common Stock and/or
SENTRY  Class A Preferred  Stock,  as the case may be,  pursuant to this Article
III.

                  (g) Any portion of the Exchange Fund  (including  the proceeds
of any  investments  thereof  and any shares of SENTRY  Common  Stock and SENTRY
Class A Preferred  Stock) that remains  unclaimed by the former  stockholders of
KNOGO or VIDEO one year after the  Effective  Time shall be delivered to SENTRY.
Any former  stockholder of KNOGO or VIDEO who has not theretofore  complied with
this  Article  III shall  thereafter  look only to SENTRY  for  payment of their
shares of SENTRY Common Stock,  SENTRY Class A Preferred Stock,  cash in lieu of
fractional  shares and unpaid  dividends and  distributions on the SENTRY Common
Stock and SENTRY Class A Preferred Stock deliverable in respect of each VIDEO or
KNOGO Share such stockholder holds as determined pursuant to this Agreement,  in
each case, without any interest thereon.

                  (h) None of VIDEO, KNOGO, SENTRY, VMC, SMC, the Exchange Agent
or any other  person  shall be liable to any  former  holder of VIDEO  Shares or
KNOGO Shares for any amount properly  delivered to a public official pursuant to
applicable abandoned property, escheat or similar laws.

                  (i) In the  event any VIDEO or KNOGO  Certificate  shall  have
been lost, stolen or destroyed,  upon the making of an affidavit of that fact by
the person  claiming such  Certificate  to be lost,  stolen or destroyed and, if
required  by SENTRY,  the  posting by such  person of a bond in such  reasonable
amount as SENTRY  may  direct as  indemnity  against  any claim that may be made
against it with respect to such  Certificate,  the Exchange  Agent will issue in
exchange  for such lost,  stolen or destroyed  Certificate  the shares of SENTRY
Common  Stock (and SENTRY Class A Preferred  Stock in the case of KNOGO  Shares)
and cash in lieu of fractional shares (in accordance with Section 3.6(f) below),
and





                                       10

<PAGE>



unpaid dividends and  distributions on shares of SENTRY Common Stock (and SENTRY
Class A Preferred Stock in the case of KNOGO Shares) as provided in this Section
3.6, deliverable in respect thereof pursuant to this Agreement.

                  3.7 Adjustment of Merger Consideration. In the event that, (i)
subsequent to the date of this Agreement but prior to the VIDEO  Effective Time,
the outstanding  shares of VIDEO shall have been changed into a different number
of  shares or a  different  claim as a result of a stock  split,  reverse  stock
split,  stock  dividend,  subdivision,   reclassification,  split,  combination,
exchange,  recapitalization or other similar transaction,  or (ii) subsequent to
the  date  of  this  Agreement  but  prior  to the  KNOGO  Effective  Time,  the
outstanding  shares of KNOGO shall have been changed into a different  number of
shares or a different  claim as a result of a stock split,  reverse stock split,
stock dividend,  subdivision,  reclassification,  split, combination,  exchange,
recapitalization  or other similar  transaction,  then the Merger  Consideration
shall be appropriately adjusted.

                  3.8 VIDEO Stock Options.  (a) At the VIDEO Effective Time, all
outstanding  options and other  rights to acquire  shares  granted to  employees
under any stock option or purchase plan,  program or similar  arrangement (each,
as  amended,  an "Option  Plan"  and,  such  options  and other  rights,  "Stock
Options")  of VIDEO  and,  with  respect to  employees  and  non-employees,  all
outstanding  warrants to purchase VIDEO Shares (the "Warrants"),  whether or not
such Stock Options or Warrants are then  exercisable or vested,  will be assumed
by SENTRY and shall be  exercisable  upon the same terms and conditions as under
the applicable  Warrant or Option Plan and option agreement  issued  thereunder,
except that (i) each such Stock Option or Warrant shall be exercisable  for that
whole number of shares of SENTRY Common Stock (to the nearest  share) into which
the number of VIDEO Shares  subject to such Stock Option or Warrant  immediately
prior to the Effective  Time would be converted  under Section 3.1, and (ii) the
option exercise price or Warrant exercise price per share of SENTRY Common Stock
shall be an amount equal to the option exercise price or warrant  exercise price
per VIDEO Share of such Stock Option or Warrant in effect  immediately  prior to
the VIDEO Effective Time divided by the VIDEO Merger  Consideration  (the option
exercise  price or Warrant  exercise  price per VIDEO Share,  as so  determined,
being  rounded  upwards to the nearest full cent).  No payment shall be made for
fractional interests.

                  (b) Except as provided herein or as otherwise agreed to by the
parties and to the extent  permitted  by the Option  Plans,  the Option Plans of
VIDEO shall  terminate as of the VIDEO  Effective  Time and any rights under any
provisions in any other plan, program or arrangement  providing for the issuance
or grant by VIDEO of any interest in respect of the capital stock of VIDEO shall
be canceled as of the VIDEO Effective Time.






                                       11

<PAGE>



                  3.9 KNOGO Stock Options.  (a) At the KNOGO Effective Time, all
outstanding  options and other  rights to acquire  Shares  granted to  employees
under any Option Plan of KNOGO,  whether or not then exercisable or vested, will
be assumed by SENTRY and shall be exercisable upon the same terms and conditions
as under the  applicable  Option Plan and option  agreement  issued  thereunder,
except that (A)(i) each such Stock  Option shall be  exercisable  for that whole
number of shares of SENTRY  Common  Stock (to the nearest  share) into which the
number of KNOGO  Shares  subject to such Stock Option  immediately  prior to the
Effective  Time would be converted  under  Section 3.2, and (ii) each such Stock
Option  shall be  exercisable  for that whole number of shares of SENTRY Class A
Preferred  Stock (to the nearest  share)  into which the number of KNOGO  Shares
subject to such Stock Option  immediately  prior to the Effective  Time would be
converted under Section 3.2,  provided that if all of the issued and outstanding
SENTRY Class A Preferred Stock has been theretofore redeemed or converted in the
manner set forth in the SENTRY Certificate of Incorporation,  attached hereto as
Exhibit A, then in lieu of the SENTRY  Class A Preferred  Stock,  the holders of
such Stock Options shall receive the same  consideration  paid to the holders of
SENTRY Class A Preferred Stock upon such  redemption or conversion,  and (B) the
option exercise price per share of SENTRY Common Stock (including SENTRY Class A
Preferred Stock) shall be an amount equal to the option exercise price per KNOGO
Share of such Stock Option in effect  immediately  prior to the KNOGO  Effective
Time divided by the KNOGO Common Stock  Consideration (the option exercise price
per KNOGO Share,  as so  determined,  being rounded  upwards to the nearest full
cent). No payment shall be made for fractional interests.

                  (b) Except as provided herein or as otherwise agreed to by the
parties and to the extent  permitted  by the Option  Plans,  the Option Plans of
KNOGO shall  terminate as of the KNOGO  Effective  Time and any rights under any
provisions in any other plan, program or arrangement  providing for the issuance
or grant by KNOGO of any interest in respect of the capital stock of KNOGO shall
be canceled as of the KNOGO Effective Time.

                  3.10  Stockholder  Approval.   (a)  This  Agreement  shall  be
submitted  for  consideration  and  approval to the holders of VIDEO Shares at a
special meeting of stockholders  duly held for such purpose by VIDEO (the "VIDEO
Stockholders' Meeting").

                  (b) This Agreement  shall be submitted for  consideration  and
approval to the  holders of KNOGO  Shares at a special  meeting of  stockholders
duly held for such purpose by KNOGO (the "KNOGO Stockholders' Meeting").

                  (c) VIDEO and  KNOGO  shall  coordinate  with  respect  to the
timing of the VIDEO Stockholders'  Meeting and the KNOGO  Stockholders'  Meeting
and shall endeavor to hold such meetings on the same day and time and as soon as
practicable after the date





                                       12

<PAGE>



hereof. Subject to their fiduciary duties, the respective boards of directors of
VIDEO and KNOGO shall recommend that their respective  stockholders approve this
Agreement and the  transactions  contemplated  hereby,  and such  recommendation
shall be  contained  in the Joint  Proxy  Statement/Prospectus  (as  defined  in
Section  6.7) of VIDEO and KNOGO  included  in the  Registration  Statement  (as
defined in Section 6.7) and  distributed to the  stockholders of VIDEO and KNOGO
in connection with the VIDEO  Stockholders'  Meeting and the KNOGO Stockholders'
Meeting.

                  (d) SENTRY  shall take any and all actions  necessary  for the
proper approvals and authorizations to be adopted by the boards of directors and
stockholders  of  SENTRY,   VMC  and  SMC,   respectively,   to  effectuate  the
transactions contemplated hereby.

                                   ARTICLE IV

                         REPRESENTATIONS AND WARRANTIES
                                    OF KNOGO

                  Except as set forth in KNOGO's  disclosure  schedule delivered
to VIDEO in connection with this Agreement (the "KNOGO Disclosure  Schedule") or
the KNOGO SEC  Documents  (as  defined  in  Section  4.6  below),  KNOGO  hereby
represents and warrants to VIDEO as follows:

                  4.1  Organization  and  Qualification.  Each of KNOGO  and its
subsidiaries  (a) is duly  incorporated,  validly  existing and in good standing
under the laws of the jurisdiction of its incorporation or organization, (b) has
requisite corporate power and authority to own, lease and operate its properties
and to carry on its  business  as it is now being  conducted  and (c) is in good
standing  and duly  qualified to do business in each  jurisdiction  in which the
transaction of its business makes such qualification necessary, except where the
failure to be so organized,  existing, qualified and in good standing or to have
such power or authority would not have a Material  Adverse Effect (as defined in
Section 9.3(d) below) on KNOGO.  True and complete  copies of the Certificate of
Incorporation and the By-Laws, as amended to date, of KNOGO and its subsidiaries
have been made available to VIDEO.

                  4.2 Capitalization.  (a) The authorized capital stock of KNOGO
consists of 10,000,000 KNOGO Shares and 3,000,000 shares of preferred stock, par
value  $.01 per share  (the  "KNOGO  Preferred  Stock").  As of the date of this
Agreement,  (i) 5,772,032  KNOGO Shares are issued and  outstanding and no KNOGO
Shares are held in treasury, (ii) 678,700 KNOGO Shares are reserved for issuance
pursuant  to  outstanding  Stock  Options and 575,300  Shares are  reserved  for
issuance  in respect of future  grants of Stock  Options  and (iii) no shares of
KNOGO Preferred Stock are issued and outstanding.  All outstanding  KNOGO Shares
are  validly  issued,  fully  paid  and  nonassessable  and are not  subject  to
preemptive





                                       13

<PAGE>



rights.  Except as disclosed in the KNOGO SEC Documents or in Section  4.2(a) of
the KNOGO Disclosure Schedule, there are no outstanding subscriptions,  options,
warrants, calls, rights, commitments or any other agreements to which KNOGO is a
party or by which KNOGO is bound which obligate  KNOGO to (i) issue,  deliver or
sell or cause to be issued, delivered or sold any additional KNOGO Shares or any
other  capital  stock of KNOGO or any  other  securities  convertible  into,  or
exercisable or  exchangeable  for, or evidencing the right to subscribe for, any
such KNOGO Shares or (ii) purchase, redeem or otherwise acquire any KNOGO Shares
and any other capital stock of KNOGO.

                  (b) All  outstanding  KNOGO Shares are duly listed for trading
on the American Stock Exchange ("AMEX").

                  (c) KNOGO owns, directly or indirectly, all of the outstanding
shares of or other interests in each of its subsidiaries, which subsidiaries are
listed  in  Section  4.2(c)  of  the  KNOGO  Disclosure  Schedule.  Each  of the
outstanding  shares of capital  stock of each of KNOGO's  subsidiaries  has been
duly authorized,  is validly paid and nonassessable,  and is owned,  directly or
indirectly,  by KNOGO, free and clear of all liens, pledges, security interests,
claims  or  other  encumbrances,   except  for  such  liens,  pledges,  security
interests,  claims or encumbrances that would not have a Material Adverse Effect
on KNOGO.  Schedule  4.2(c)  of the KNOGO  Disclosure  Schedule  sets  forth the
following information for each of KNOGO's subsidiaries,  if applicable: (i) name
and jurisdiction of incorporation or organization; (ii) authorized capital stock
or share capital;  and (iii) number of issued and outstanding  shares of capital
stock or share capital.

                  (d)  Except  as set  forth  in  Section  4.2(d)  of the  KNOGO
Disclosure Schedule, KNOGO does not own, directly or indirectly, any interest or
investment  (whether  equity  or debt) in any  corporation,  partnership,  joint
venture,  business,  trust or  entity  (other  than  investments  in  short-term
investment securities).

                  (e)  Except  as  provided  in the KNOGO  SEC  Documents  or in
Section 4.2(e) of the KNOGO Disclosure  Schedule,  there are no voting trusts or
shareholder  agreements  to which KNOGO is a party with respect to the voting of
the capital stock of KNOGO.

                  4.3  Authorization  and Validity of  Agreement.  KNOGO has the
requisite  corporate  power and authority to execute and deliver this  Agreement
and to consummate the  transactions  contemplated  hereby in accordance with the
terms hereof  (subject to the approval  and adoption of this  Agreement  and the
KNOGO Merger by the holders of a majority of the outstanding  KNOGO Shares,  and
the filing and  recordation of appropriate  merger  documents as required by the
DGCL).  KNOGO's Board of Directors (the "KNOGO  Board") has duly  authorized the
execution,  delivery and  performance of this  Agreement by KNOGO,  and no other
corporate proceedings on the part




                                       14

<PAGE>



of  KNOGO  are  necessary  to  authorize  this  Agreement  or  the  transactions
contemplated  hereby (other than the approval and adoption of this Agreement and
the KNOGO Merger by the holders of a majority of the outstanding  KNOGO Shares).
This Agreement has been duly executed and delivered by KNOGO and,  assuming this
Agreement  constitutes the legal, valid and binding obligation of VIDEO, SENTRY,
VMC and SMC,  constitutes  the legal,  valid and  binding  obligation  of KNOGO,
enforceable against KNOGO in accordance with its terms, except as may be limited
by any bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance
or other similar laws affecting the enforcement of creditors'  rights  generally
or by general principles of equity (regardless of whether such enforceability is
considered in a proceeding in equity or at law).

                  4.4  Consents and  Approvals.  (a) Neither the  execution  and
delivery  of this  Agreement  by  KNOGO  nor the  consummation  by  KNOGO of the
transactions  contemplated hereby will require on the part of KNOGO any consent,
approval,  authorization  or permit of, or filing with or  notification  to, any
governmental  or  regulatory  authority,  except  (i)  as  may  be  required  in
connection with the applicable  requirements of the Hart-Scott-Rodino  Antitrust
Improvements  Act of 1976,  as amended  (the "HSR  Act"),  (ii)  pursuant to the
applicable  requirements  of the Securities Act, the Securities and Exchange Act
of 1934, as amended (the "Exchange Act"), the AMEX on which the KNOGO Shares are
listed,  and state  securities or "blue sky" laws and state takeover laws, (iii)
the filing and recordation of the Certificate of Merger pursuant to the DGCL and
appropriate  documents  with the relevant  authorities  of other states in which
KNOGO is  authorized  to do  business,  (iv) as set forth in Section  4.4 of the
KNOGO  Disclosure  Schedule  or (v) where the  failure to obtain  such  consent,
approval, authorization or permit, or to make such filing or notification, would
not have a Material  Adverse Effect on KNOGO or prevent the  consummation of the
transactions  contemplated  hereby.  The  affirmative  vote of the  holders of a
majority  of the  outstanding  KNOGO  Shares is the only vote of the  holders of
capital stock of KNOGO necessary to approve the KNOGO Merger.

                  (b)  The  KNOGO  Board  has  approved  the  execution  of  the
Support/Voting  Agreements  to be entered into between  KNOGO and certain  VIDEO
stockholders.

                  4.5 No  Violation.  Except as set forth in Section  4.5 of the
KNOGO Disclosure  Schedule,  assuming the KNOGO Merger has been duly approved by
the holders of a majority of the outstanding KNOGO Shares, neither the execution
and  delivery of this  Agreement by KNOGO nor the  consummation  by KNOGO of the
transactions  contemplated hereby will (a) conflict with or violate the Articles
of  Incorporation,  as amended,  or By-Laws of KNOGO or any of its subsidiaries,
(b) result in a violation or breach of,  constitute  a default  (with or without
notice or lapse of time, or both) under,





                                       15

<PAGE>



give rise to any  right of  termination,  cancellation  or  acceleration  of, or
result in the imposition of any lien,  charge or other encumbrance on any assets
or property  of KNOGO or any of its  subsidiaries  pursuant  to any note,  bond,
mortgage, indenture,  contract, agreement, lease, license or other instrument or
obligation  to  which  KNOGO or any of its  subsidiaries  is a party or by which
KNOGO, any of its subsidiaries,  or any of their respective assets or properties
are bound,  except for such  violations,  breaches  and  defaults  (or rights of
termination,   cancellation   or   acceleration  or  lien  or  other  charge  or
encumbrance)  as to which  requisite  waivers or consents  have been obtained or
which  would  not  have a  Material  Adverse  Effect  on KNOGO  or  prevent  the
consummation  of  the  transactions  contemplated  hereby  or (c)  assuming  the
consents,  approvals,  authorizations  or permits and  filings or  notifications
referred to in Section 4.4 and this Section 4.5 are duly and timely  obtained or
made and the  approval  of the KNOGO  Merger by the holders of a majority of the
outstanding KNOGO Shares has been obtained, violate any order, writ, injunction,
decree, statute, rule or regulation applicable to KNOGO, any of its subsidiaries
or any of their  respective  assets and  properties,  except for such violations
which  would  not  have a  Material  Adverse  Effect  on KNOGO  or  prevent  the
consummation of the transactions contemplated hereby.

                  4.6 SEC Reports;  Financial  Statements.  (a) Since January 1,
1995,  KNOGO has filed with the Securities and Exchange  Commission  (the "SEC")
all forms,  reports,  schedules,  statements and other documents  required to be
filed by it with the SEC pursuant to the Exchange  Act, the  Securities  Act and
the  SEC's  rules and  regulations  thereunder  (collectively,  the  "KNOGO  SEC
Documents").  The  KNOGO  SEC  Documents,  including,  without  limitation,  any
financial statements or schedules included therein, at the time filed, or in the
case of  registration  statements  on  their  respective  effective  dates,  (i)
complied as to form in all material respects with the applicable requirements of
the Exchange Act and the Securities  Act, as the case may be, and the applicable
rules and  regulations  of the SEC thereunder and (ii) did not at the time filed
(or,  in the case of  registration  statements,  at the time of  effectiveness),
contain any untrue statement of a material fact or omit to state a material fact
required to be stated therein or necessary in order to make the statements  made
therein,  in  light  of the  circumstances  under  which  they  were  made,  not
misleading.

                  (b) Each of the  consolidated  financial  statements  of KNOGO
(including  any  related  notes  thereto)  included  in the KNOGO SEC  Documents
(excluding the KNOGO SEC Documents described in Section 4.7 hereof) comply as to
form in all material respects with applicable  accounting  requirements and with
the published rules and regulations of the SEC with respect  thereto,  have been
prepared in accordance with generally accepted accounting  principles applied on
a  consistent  basis during the period  involved  (except as may be indicated in
such financial statements or in the notes thereto or,





                                       16

<PAGE>



in the case of unaudited financial statements,  as permitted by the requirements
of Form 10-Q) and fairly present in all material respects (subject,  in the case
of the unaudited  statements,  to normal year-end adjustments and the absence of
footnotes)  the  financial  position  of KNOGO as of the dates  thereof  and the
results of KNOGO's operations and cash flows for the periods presented therein.

                  4.7 Joint Proxy Statement/Prospectus.  None of the information
supplied by KNOGO to be included in the Joint Proxy  Statement/Prospectus or the
Registration Statement will, in the case of the Joint Proxy Statement/Prospectus
or any amendments thereof or supplements  thereto, at the time of the mailing of
the Joint Proxy  Statement/Prospectus  or any amendments  thereof or supplements
thereto, and at the time of the KNOGO Stockholders'  Meeting, or, in the case of
the  Registration  Statement,  at  the  time  it  becomes  effective  and at the
Effective Time, contain any untrue statement of a material fact or omit to state
a  material  fact  required  to be  stated  therein  or  necessary  to make  the
statements  therein,  in light of the circumstances  under which they were made,
not misleading.  The Joint Proxy  Statement/Prospectus will comply as to form in
all material respects with the provisions of the Securities Act and the Exchange
Act.  Notwithstanding  the foregoing,  KNOGO makes no representation or warranty
with  respect to the  statements  made in the Joint  Proxy  Statement/Prospectus
based on information  supplied by or on behalf of VIDEO,  SENTRY,  VMC or SMC or
any of their respective affiliates specifically for inclusion therein.

                  4.8 Compliance  with Law. Except as set forth in the KNOGO SEC
Documents or in Section 4.8 of the KNOGO Disclosure Schedule,  neither KNOGO nor
any  of its  subsidiaries  is in  violation  of any  applicable  statute,  rule,
regulation,  decree  or  order  of  any  governmental  or  regulatory  authority
applicable to KNOGO or its  subsidiaries,  except for violations which would not
have a Material Adverse Effect on KNOGO. Without limiting the foregoing,  except
for matters  which would not have a Material  Adverse  Effect on KNOGO and those
matters  disclosed  in the KNOGO SEC  Documents  or in Section  4.8 of the KNOGO
Disclosure Schedule,  to the Knowledge of KNOGO, (a) the businesses of KNOGO and
its subsidiaries are being conducted in compliance with applicable Environmental
Laws (as defined below),  (b) the businesses of KNOGO and its subsidiaries  have
not made,  caused or  contributed  to any material  release of any  hazardous or
toxic waste or substance into the  environment  and (c) neither KNOGO nor any of
its subsidiaries is subject to any compliance  agreement or settlement agreement
from  an  alleged   violation  of  Environmental   Laws.  For  purposes  hereof,
"Environmental  Laws" shall mean all  applicable  laws  relating to pollution or
protection of the environment,  including the Resource Conservation and Recovery
Act, the Federal Water Pollution  Control Act, the Toxic Substances  Control Act
and the Comprehensive  Environmental  Response,  Compensation and Liability Act.
Except as





                                       17

<PAGE>



set forth in the KNOGO SEC  Documents or in Section 4.8 of the KNOGO  Disclosure
Schedule  or as  contemplated  or  permitted  by this  Agreement,  KNOGO and its
subsidiaries  hold all permits,  licenses,  exemptions,  orders and approvals of
governmental  and  regulatory  authorities  necessary  for the  conduct of their
respective businesses, as now being conducted,  except where the failure to hold
permits,  licenses,  exemptions,  orders and approvals would not have a Material
Adverse Effect on KNOGO.

                  4.9 Absence of Certain  Changes.  Except as  disclosed  in the
KNOGO SEC Documents or in Section 4.9 of the KNOGO  Disclosure  Schedule,  since
June 30, 1996  through the date of this  Agreement,  KNOGO and its  subsidiaries
have conducted their respective businesses only in the ordinary course and there
has not been (a) any  changes  which  could  have a Material  Adverse  Effect on
KNOGO; (b) any declaration,  setting aside or payment of any dividend or payment
in cash, stock or property or other distribution with respect to KNOGO's capital
stock; (c) any reclassification,  combination,  split, subdivision,  redemption,
purchase or other acquisition, directly or indirectly, of any of KNOGO's capital
stock; (d) any material change in KNOGO's  accounting  principles,  practices or
methods;  or (e) any material  alteration in the character or conduct of KNOGO's
business from that conducted and contemplated as of June 30, 1996.

                  4.10 No Undisclosed  Liabilities.  Except (a) for  liabilities
incurred  in the  ordinary  course of  business,  (b)  liabilities  incurred  in
connection with the transactions contemplated by this Agreement, (c) liabilities
which would not have a Material  Adverse Effect on KNOGO and (d) as disclosed in
the KNOGO SEC Documents or as set forth in Section 4.10 of the KNOGO  Disclosure
Schedule,  from June 30,  1996 until the date of this  Agreement,  KNOGO and its
subsidiaries had not incurred any material liabilities that would be required to
be  reflected  in or  reserved  against a  consolidated  balance  sheet of KNOGO
prepared in accordance with generally accepted accounting principles.

                  4.11  Litigation.   Except  as  disclosed  in  the  KNOGO  SEC
Documents  or in Section  4.11 of the KNOGO  Disclosure  Schedule,  there are no
claims,  actions,  proceedings or governmental  investigations  pending, nor has
KNOGO or any of its  subsidiaries  received  notice of any  threatened,  claims,
actions,  proceedings or governmental investigations against KNOGO or any of its
subsidiaries by or before any court or other  governmental  or regulatory  body,
which, if adversely  determined,  would have a Material Adverse Effect on KNOGO.
Neither KNOGO or any of its subsidiaries nor their respective  assets is subject
to any outstanding and unsatisfied order, writ,  judgment,  injunction or decree
which would have a Material Adverse Effect on KNOGO.

                  4.12 Employee Benefit Matters.  All employee benefit plans and
other benefit arrangements covering employees of KNOGO





                                       18

<PAGE>



and its  subsidiaries  (the "KNOGO Benefit Plans") are listed in Section 4.12 of
the KNOGO  Disclosure  Schedule,  except such  benefit  plans and other  benefit
arrangements  which  are not  material.  True and  complete  copies of the KNOGO
Benefit Plans have been made available to VIDEO. To the extent  applicable,  the
KNOGO Benefit Plans comply in all material respects with the requirements of the
Employee  Retirement Income Security Act of 1974, as amended ("ERISA"),  and the
Code,  except as disclosed in Section 4.12(a) of the KNOGO Disclosure  Schedule,
and any KNOGO Benefit Plan intended to be qualified  under Section 401(a) of the
Code has been  determined by the Internal  Revenue  Service (the "IRS") to be so
qualified.  No KNOGO Benefit Plan is covered by Title IV of ERISA or Section 412
of the  Code.  Neither  KNOGO  nor  any of its  subsidiaries  has  incurred  any
liability or penalty under  Section 4975 of the Code or Section  502(i) of ERISA
with  respect  to any KNOGO  Benefit  Plan,  except as would not have a Material
Adverse  Effect on KNOGO.  Except as disclosed  in Section  4.12(a) of the KNOGO
Disclosure   Schedule,   each  KNOGO  Benefit  Plan  has  been   maintained  and
administered  in all  material  respects in  compliance  with its terms and with
ERISA and the Code to the extent applicable  thereto. To the Knowledge of KNOGO,
there are no pending,  nor has KNOGO or any of its subsidiaries  received notice
of any  threatened,  claims  against  or  otherwise  involving  any of the KNOGO
Benefit Plans,  except as would not have a Material Adverse Effect on KNOGO. All
material  contributions required to be made as of the date this Agreement to the
KNOGO Benefit Plans have been made or provided for. Neither KNOGO nor any entity
under  "common  control"  with KNOGO within the meaning of Section 4001 of ERISA
has contributed to, or been required to contribute to, any "multi-employer plan"
(as defined in Sections 3(37) and 4001(a)(3) of ERISA).

                  4.13 Taxes.  Except as disclosed in the KNOGO SEC Documents or
in  Section  4.13  of the  KNOGO  Disclosure  Schedule,  KNOGO  and  each of its
subsidiaries (a) have filed all federal,  state and foreign tax returns required
to be filed by KNOGO or any of its subsidiaries for tax years ended prior to the
date of this  Agreement,  except for those tax  returns  the failure of which to
file would not have a Material Adverse Effect on KNOGO or for which requests for
extensions  have been timely  filed,  and all such  returns are  complete in all
material  respects,  (b) have  paid or  accrued  all  taxes  shown to be due and
payable  on such  returns,  (c) have  accrued  all such  taxes for such  periods
subsequent to the periods covered by such returns ending on or prior to the date
hereof and (d) have  "open"  years for federal  income tax  returns  only as set
forth in the KNOGO SEC  Documents  or in  Section  4.13 of the KNOGO  Disclosure
Schedule.  There  are no liens  for  taxes on the  assets of KNOGO or any of its
subsidiaries,  except for liens that would not have a Material Adverse Effect on
KNOGO,  and  there  is no  pending,  nor has  KNOGO  or any of its  subsidiaries
received notice of any threatened, tax audit, examination,  refund litigation or
adjustment in controversy which, if determined adversely,  would have a Material
Adverse Effect on KNOGO. Neither KNOGO nor any of





                                       19

<PAGE>



its  subsidiaries  is a party to any agreement  providing for the  allocation or
sharing of taxes.

                  4.14 Intellectual  Property.  To the Knowledge of KNOGO, KNOGO
and  its  subsidiaries  own  or  possess  rights  in  all  patents,  trademarks,
tradenames,  copyrights  and  other  intellectual  property  rights  used  in or
necessary for the conduct of the businesses of KNOGO and its subsidiaries as now
operated (collectively, "KNOGO Intellectual Property"), except where the failure
to own or possess any such KNOGO Intellectual Property would not have a Material
Adverse Effect on KNOGO.  Neither KNOGO nor any of its subsidiaries has received
any notice that the products of KNOGO and its subsidiaries,  or the use thereof,
violate,  infringe or otherwise conflict with the Intellectual Property of third
parties,  except for such violations,  infringements or conflicts that would not
have a  Material  Adverse  Effect  on KNOGO or as  disclosed  in the  KNOGO  SEC
Documents or in Section 4.14 of the KNOGO Disclosure Schedule.

                  4.15 Labor Matters.  Neither KNOGO nor any of its subsidiaries
is a party to, or bound by, any  collective  bargaining  agreement,  contract or
other agreement or understanding with a labor union or labor union organization.
There is no unfair labor practice or labor arbitration proceeding pending or, to
the  Knowledge of KNOGO,  threatened  against  KNOGO or any of its  subsidiaries
relating to their  respective  businesses,  except for any such  proceeding that
would not have a Material Adverse Effect on KNOGO.

                  4.16 Brokers and Finders. No broker, finder or investment bank
has  acted  directly  or  indirectly  for  KNOGO,  nor has  KNOGO  incurred  any
obligation  to pay  any  brokerage,  finder's  or  other  fee or  commission  in
connection with the transactions  contemplated  hereby,  other than Donald & Co.
Securities, the fees and expenses of which shall be borne by KNOGO.

                  4.17 Opinion of Financial  Advisor.  Donald & Co.  Securities,
KNOGO's  financial  advisor,  has delivered its opinion,  dated the date of this
Agreement,  to the KNOGO Board to the effect  that,  as of such date,  the KNOGO
Merger  Consideration is fair, from a financial point of view, to the holders of
KNOGO Shares.

                  4.18 Section 351/Reorganization  Treatment.  Neither KNOGO nor
any KNOGO  subsidiary has taken or failed to take any action or has knowledge of
any fact or  circumstance  that is  reasonably  likely to, (i) prevent the KNOGO
Merger from  qualifying  as an  exchange  governed by Section 351 of the Code or
(ii)  prevent the VIDEO Merger from  constituting  a  reorganization  within the
meaning of Section 368(a) of the Code or from qualifying as an exchange governed
by Section 351 of the Code.

                  4.19 VIDEO  Shares  Ownership.  Except as disclosed in Section
4.19 of the KNOGO Disclosure Schedule, neither KNOGO nor





                                       20

<PAGE>



any of its  affiliates  owns any  VIDEO  Shares  or other  securities  or rights
convertible, exchangeable or otherwise exercisable into VIDEO Shares.


                                    ARTICLE V

                         REPRESENTATIONS AND WARRANTIES
                          OF VIDEO, SENTRY, VMC AND SMC

                  Except as set forth in VIDEO's  disclosure  schedule delivered
to KNOGO in connection with this Agreement (the "VIDEO Disclosure  Schedule") or
the VIDEO SEC Documents (as defined in Section 3.6 below),  VIDEO,  SENTRY,  VMC
and SMC hereby represent and warrant to KNOGO as follows:

                  5.1 Organization and Qualification. Each of VIDEO, SENTRY, VMC
and SMC (a) is duly  incorporated,  validly  existing and in good standing under
the  laws of the  jurisdiction  of its  incorporation,  (b)  has  the  requisite
corporate  power and authority to own,  lease and operate its  properties and to
carry on its business as it is now being  conducted  and (c) is in good standing
and duly qualified to do business in each  jurisdiction in which the transaction
of its business makes such qualification necessary,  except where the failure to
be so organized,  existing, qualified and in good standing or to have such power
or authority would not have a Material Adverse Effect on VIDEO,  SENTRY,  VMC or
SMC. True and complete  copies of the Articles or Certificate of  Incorporation,
as the case may be,  and the  By-Laws  as  amended  to  date,  of VIDEO  and its
subsidiaries have been made available to KNOGO.

                  5.2 Capitalization.  (a) The authorized capital stock of VIDEO
consists of  10,000,000  VIDEO  Shares.  As of the date of this  Agreement,  (i)
4,841,962  VIDEO Shares are issued and  outstanding and no VIDEO Shares are held
in  treasury,  (ii) 370,000  VIDEO Shares are reserved for issuance  pursuant to
outstanding  stock options and 180,000 VIDEO Shares are reserved for issuance in
respect of future  grants of stock  options and (iii)  454,114  VIDEO Shares are
reserved  for issuance  pursuant to the warrants set forth in Section  5.2(a) of
the VIDEO Disclosure Schedule (the "Warrants"). All outstanding VIDEO Shares are
validly issued,  fully paid and  nonassessable and are not subject to preemptive
rights.  Except as disclosed in the VIDEO SEC  Documents  (as defined in Section
5.6) or in  Section  5.2(a)  of the  VIDEO  Disclosure  Schedule,  there  are no
outstanding subscriptions,  options, warrants, calls, rights, commitments or any
other  agreements  to which  VIDEO is a party or by which  VIDEO is bound  which
obligate VIDEO to (i) issue, deliver or sell or cause to be issued, delivered or
sold any  additional  VIDEO  Shares or any other  capital  stock of VIDEO or any
other  securities  convertible  into, or  exercisable  or  exchangeable  for, or
evidencing the right to subscribe for, any such VIDEO Shares or (ii) purchase,





                                       21

<PAGE>



redeem or  otherwise  acquire any VIDEO  Shares and any other  capital  stock of
VIDEO.

                  (b) All  outstanding  VIDEO Shares are duly listed for trading
on the NASDAQ Stock Market's SmallCap Market (the "NASDAQ SmallCap").

                  (c) VIDEO owns, directly or indirectly, all of the outstanding
shares of or other interests in each of its subsidiaries, which subsidiaries are
listed  in  Section  5.2(c)  of  the  VIDEO  Disclosure  Schedule.  Each  of the
outstanding  shares of capital  stock of each of VIDEO's  subsidiaries  has been
duly authorized,  is validly paid and nonassessable,  and is owned,  directly or
indirectly,  by VIDEO, free and clear of all liens, pledges, security interests,
claims  or  other  encumbrances,   except  for  such  liens,  pledges,  security
interests,  claims or encumbrances that would not have a Material Adverse Effect
on VIDEO.  Schedule  5.2(c)  of the VIDEO  Disclosure  Schedule  sets  forth the
following information for each of VIDEO's subsidiaries,  if applicable: (i) name
and jurisdiction of incorporation or organization; (ii) authorized capital stock
or share capital;  and (iii) number of issued and outstanding  shares of capital
stock or share capital.

                  (d)  Except  as set  forth  in  Section  5.2(d)  of the  VIDEO
Disclosure Schedule, VIDEO does not own, directly or indirectly, any interest or
investment  (whether  equity  or debt) in any  corporation,  partnership,  joint
venture,  business,  trust or  entity  (other  than  investments  in  short-term
investment securities).

                  (e)  Except  as  provided  in the VIDEO  SEC  Documents  or in
Section 5.2(e) of the VIDEO Disclosure  Schedule,  there are no voting trusts or
shareholder  agreements  to which VIDEO is a party with respect to the voting of
the capital stock of VIDEO.

                  (f)  The  authorized  capital  stock  of  SENTRY  consists  of
100,000,000  shares of SENTRY  Common Stock and  25,000,000  shares of preferred
stock, par value $0.001 per share (the "SENTRY Preferred Stock"). As of the date
of this  Agreement,  (i) one (1) share of  SENTRY  Common  Stock is  issued  and
outstanding  and no shares of SENTRY Common Stock are held in treasury,  (ii) no
shares of SENTRY Common Stock are reserved for issuance  pursuant to outstanding
Stock  Options and no shares of SENTRY Common Stock are reserved for issuance in
respect  of  future  grants  of Stock  Options  and  (iii) no  shares  of SENTRY
Preferred Stock are issued and  outstanding.  All  outstanding  shares of SENTRY
Common  Stock are  validly  issued,  fully  paid and  nonassessable  and are not
subject to preemptive rights. There are no outstanding  subscriptions,  options,
warrants,  calls, rights,  commitments or any other agreements,  other than this
Agreement, to which SENTRY is a party or by which SENTRY is bound which obligate
SENTRY to (i) issue,  deliver or sell or cause to be issued,  delivered  or sold
any additional capital stock of SENTRY or





                                       22

<PAGE>



any other securities  convertible  into, or exercisable or exchangeable  for, or
evidencing the right to subscribe for, any such shares of SENTRY Common Stock or
(ii) purchase,  redeem or otherwise acquire any capital stock of SENTRY.  All of
the shares of SENTRY  Common  Stock and  SENTRY  Class A  Preferred  Stock to be
issued to holders of KNOGO Shares and VIDEO Shares have been duly authorized for
issuance  and,  when issued in  accordance  with the VIDEO  Merger and the KNOGO
Merger and this Agreement, will be validly issued, fully paid and nonassessable,
and will not be subject to and will not be issued in violation of any preemptive
rights.

                  (g) The authorized capital stock of VMC consists of 100 shares
of VMC  Common  Stock.  As of the date of this  Agreement,  (i) one share of VMC
Common  Stock is issued and  outstanding  and no shares of VMC Common  Stock are
held in  treasury,  and (ii) no shares of VMC  Common  Stock  are  reserved  for
issuance pursuant to outstanding stock options and no shares of VMC Common Stock
are  reserved  for issuance in respect of future  grants of stock  options.  All
outstanding  shares of VMC  Common  Stock are  validly  issued,  fully  paid and
nonassessable and are not subject to preemptive rights. There are no outstanding
subscriptions,  options,  warrants,  calls,  rights,  commitments  or any  other
agreements  to which VMC is a party or by which VMC is bound which  obligate VMC
to (i)  issue,  deliver  or sell or cause to be  issued,  delivered  or sold any
additional  shares of VMC Common Stock or any other  capital stock of VMC or any
other  securities  convertible  into, or  exercisable  or  exchangeable  for, or
evidencing  the right to  subscribe  for, any such shares of VMC Common Stock or
(ii)  purchase,  redeem or otherwise  acquire any shares of VMC Common Stock and
any other capital stock of VMC.

                  (h) The authorized capital stock of SMC consists of 100 shares
of SMC  Common  Stock.  As of the date of this  Agreement,  (i) one share of SMC
Common  Stock is issued and  outstanding  and no shares of SMC Common  Stock are
held in  treasury,  and (ii) no shares of SMC  Common  Stock  are  reserved  for
issuance pursuant to outstanding stock options and no shares of SMC Common Stock
are  reserved  for issuance in respect of future  grants of stock  options.  All
outstanding  shares of SMC  Common  Stock are  validly  issued,  fully  paid and
nonassessable and are not subject to preemptive rights. There are no outstanding
subscriptions,  options,  warrants,  calls,  rights,  commitments  or any  other
agreements  to which SMC is a party or by which SMC is bound which  obligate SMC
to (i)  issue,  deliver  or sell or cause to be  issued,  delivered  or sold any
additional  shares of SMC Common Stock or any other  capital stock of SMC or any
other  securities  convertible  into, or  exercisable  or  exchangeable  for, or
evidencing  the right to  subscribe  for, any such shares of SMC Common Stock or
(ii)  purchase,  redeem or otherwise  acquire any shares of SMC Common Stock and
any other capital stock of SMC.






                                       23

<PAGE>



                  5.3  Authorization  and Validity of Agreement.  Each of VIDEO,
SENTRY,  VMC and SMC has the requisite  corporate power and authority to execute
and deliver this  Agreement  and to  consummate  the  transactions  contemplated
hereby in accordance with the terms hereof (subject to the approval and adoption
of this  Agreement,  the VIDEO  Merger and the KNOGO  Merger by the holders of a
majority of the outstanding VIDEO Shares,  SENTRY Common Stock, VMC Common Stock
and  SMC  Common  Stock,  as  applicable,  and the  filing  and  recordation  of
appropriate merger documents as required by the DGCL and the Minnesota Act). The
Boards  of  Directors  of  VIDEO  (the  "VIDEO  Board"),  SENTRY,  VMC and  SMC,
respectively,  and VIDEO, as the sole stockholder of SENTRY,  and SENTRY, as the
sole  stockholder of VMC and SMC, have duly  authorized the execution,  delivery
and performance of this Agreement by each of VIDEO,  SENTRY, VMC and SMC, and no
other corporate  proceedings on the part of either VIDEO, SENTRY, VMC or SMC are
necessary to authorize this Agreement or the  transactions  contemplated  hereby
(other than the approval and  adoption of this  Agreement,  the VIDEO Merger and
the KNOGO Merger by the holders of a majority of the outstanding  VIDEO Shares).
This  Agreement has been duly  executed and delivered by each of VIDEO,  SENTRY,
VMC and SMC and,  assuming  this  Agreement  constitutes  the  legal,  valid and
binding obligation of KNOGO, constitutes the legal, valid and binding obligation
of each of  VIDEO,  SENTRY,  VMC and SMC,  enforceable  against  each of  VIDEO,
SENTRY,  VMC and SMC in accordance  with its terms,  except as may be limited by
any bankruptcy, insolvency, reorganization, moratorium, fraudulent conveyance or
other similar laws affecting the enforcement of creditors'  rights  generally or
by general  principles of equity  (regardless of whether such  enforceability is
considered in a proceeding in equity or at law).

                  5.4  Consents and  Approvals.  (a) Neither the  execution  and
delivery of this Agreement by VIDEO, SENTRY, VMC and SMC nor the consummation by
VIDEO, SENTRY, VMC and SMC of the transactions  contemplated hereby will require
on the part of VIDEO, SENTRY, VMC or SMC any consent, approval, authorization or
permit of, or filing with or  notification  to, any  governmental  or regulatory
authority,  except (i) as may be  required  in  connection  with the  applicable
requirements of the HSR Act, (ii) pursuant to the applicable requirements of the
Securities  Act, the Exchange  Act,  and the rules and  regulations  promulgated
thereunder,  the NASDAQ  SmallCap  on which VIDEO  Shares are listed,  and state
securities  or "blue  sky" laws and state  takeover  laws,  (iii) the filing and
recordation  of the  Certificate  of Merger,  the  Articles  of Merger and other
merger  documents  pursuant to the DGCL and the Minnesota Act, (iv) as set forth
in Section  5.4 of the VIDEO  Disclosure  Schedule  or (v) where the  failure to
obtain such consent,  approval,  authorization or permit, or to make such filing
or notification,  would not have a Material Adverse Effect on VIDEO, SENTRY, VMC
or SMC or prevent the consummation of the transactions  contemplated hereby. The
affirmative vote of the holders of a majority of the outstanding





                                       24

<PAGE>



VIDEO Shares is the only vote of the holders of capital stock of VIDEO necessary
to approve the VIDEO Merger.

                  (b)  The  VIDEO  Board  has  approved  the  execution  of  the
Support/Voting  Agreements  to be entered into between  VIDEO and certain  KNOGO
stockholders.

                  5.5 No  Violation.  Except as set forth in Section  5.5 of the
VIDEO Disclosure  Schedule,  assuming the VIDEO Merger has been duly approved by
the holders of a majority of the outstanding VIDEO Shares, neither the execution
and delivery of this Agreement by VIDEO, SENTRY, VMC or SMC nor the consummation
by VIDEO,  SENTRY, VMC and SMC of the transactions  contemplated hereby will (a)
conflict with or violate the Articles of  Incorporation or By-Laws of VIDEO, the
SENTRY  Certificate of Incorporation,  the SENTRY Bylaws, the VMC Certificate of
Incorporation,  the VMC Bylaws, the SMC Certificate of Incorporation, or the SMC
Bylaws,  (b) result in a violation or breach of,  constitute a default  (with or
without  notice  or lapse of time,  or both)  under,  give  rise to any right of
termination, cancellation or acceleration of, or result in the imposition of any
lien,  charge or other encumbrance on any assets or property of either of VIDEO,
SENTRY, VMC or SMC pursuant to, any note, bond, mortgage,  indenture,  contract,
agreement,  lease,  license or other instrument or obligation to which either of
VIDEO, SENTRY, VMC or SMC is a party or by which either of VIDEO, SENTRY, VMC or
SMC or any of their respective  assets or properties are bound,  except for such
violations,  breaches and defaults (or rights of  termination,  cancellation  or
acceleration  or lien or other  charge  or  encumbrance)  as to which  requisite
waivers  or  consents  have been  obtained  or which  would not have a  Material
Adverse  Effect  on  either  of  VIDEO,  SENTRY,  VMC  or  SMC  or  prevent  the
consummation  of  the  transactions  contemplated  hereby  or (c)  assuming  the
consents,  approvals,  authorizations  or permits and  filings or  notifications
referred to in Section 5.4 and this Section 5.5 are duly and timely  obtained or
made,  and the  approval of the VIDEO Merger by the holders of a majority of the
outstanding VIDEO Shares has been obtained, violate any order, writ, injunction,
decree,  statute,  rule or regulation applicable to either of VIDEO, SENTRY, VMC
or  SMC or any of  their  respective  assets  or  properties,  except  for  such
violations  which would not in the aggregate  have a Material  Adverse Effect on
either  of  VIDEO,  SENTRY,  VMC or SMC,  or  prevent  the  consummation  of the
transactions contemplated hereby.

                  5.6 SEC Reports; Financial Statements. (a) Since September 30,
1994, VIDEO has filed with the SEC all forms, reports, schedules, statements and
other documents required to be filed by it with the SEC pursuant to the Exchange
Act,  the  Securities  Act  and  the  SEC's  rules  and  regulations  thereunder
(collectively,  the "VIDEO SEC Documents"). The VIDEO SEC Documents,  including,
without limitation,  any financial  statements or schedules included therein, at
the time filed, or in the case of





                                       25

<PAGE>



registration  statements on their respective effective dates, (i) complied as to
form in all material  respects with the applicable  requirements of the Exchange
Act and the  Securities  Act, as the case may be, and the  applicable  rules and
regulations of the SEC thereunder and (ii) did not at the time filed (or, in the
case of  registration  statements,  at the time of  effectiveness),  contain any
untrue statement of a material fact or omit to state a material fact required to
be stated therein or necessary in order to make the statements made therein,  in
light of the circumstances under which they were made, not misleading.

                  (b) Each of the  consolidated  financial  statements  of VIDEO
(including  any  related  notes  thereto)  included  in the VIDEO SEC  Documents
(excluding the VIDEO SEC Documents described in Section 5.7 hereof) comply as to
form in all material respects with applicable  accounting  requirements and with
the published rules and regulations of the SEC with respect  thereto,  have been
prepared in accordance with generally accepted accounting  principles applied on
a  consistent  basis during the period  involved  (except as may be indicated in
such  financial  statements or in the notes thereto or, in the case of unaudited
financial statements,  as permitted by the requirements of Form 10-Q) and fairly
present  in all  material  respects  (subject,  in  the  case  of the  unaudited
statements,  to normal  year-end  adjustments  and the absence of footnotes) the
financial  position  of VIDEO as of the dates  thereof  and the  results  of the
VIDEO's operations and cash flows for the periods presented therein.

                  5.7 Joint Proxy Statement/Prospectus.  None of the information
supplied  by  VIDEO,  SENTRY,  VMC or  SMC to be  included  in the  Joint  Proxy
Statement/Prospectus  or the  Registration  Statement  will,  in the case of the
Joint  Proxy  Statement/Prospectus  or any  amendments  thereof  or  supplements
thereto, at the time of the mailing of the Joint Proxy  Statement/Prospectus  or
any  amendments  thereof or  supplements  thereto,  and at the time of the VIDEO
Stockholders'  Meeting,  or, in the case of the Registration  Statement,  at the
time  it  becomes  effective  and at the  Effective  Time,  contain  any  untrue
statement  of a material  fact or omit to state a material  fact  required to be
stated therein or necessary in order to make the statements therein, in light of
the  circumstances  under which they were made, not misleading.  The Joint Proxy
Statement/Prospectus  will comply as to form in all material  respects  with the
provisions  of the  Securities  Act and the Exchange  Act.  Notwithstanding  the
foregoing,  neither  VIDEO,  SENTRY,  VMC nor SMC  makes any  representation  or
warranty   with   respect   to  the   statements   made  in  the   Joint   Proxy
Statement/Prospectus  based on information  supplied by or on behalf of KNOGO or
any of its affiliates specifically for inclusion therein.

                  5.8 Compliance  with Law. Except as set forth in the VIDEO SEC
Documents or in Section 5.8 of the VIDEO  Disclosure  Schedule,  VIDEO is not in
violation of any applicable statute,





                                       26

<PAGE>



rule,  regulation,  decree or order of any governmental or regulatory  authority
applicable  to VIDEO,  except  for  violations  which  would not have a Material
Adverse  Effect on VIDEO.  Without  limiting the  foregoing,  except for matters
which  would not have a  Material  Adverse  Effect  on VIDEO  and those  matters
disclosed in the VIDEO SEC  Documents or in Section 5.8 of the VIDEO  Disclosure
Schedule,  to the  Knowledge  of  VIDEO,  (a) the  business  of  VIDEO  is being
conducted in compliance with applicable  Environmental Laws, (b) the business of
VIDEO has not  made,  caused  or  contributed  to any  material  release  of any
hazardous or toxic waste or substance into the  environment and (c) VIDEO is not
subject to any  compliance  agreement or  settlement  agreement  from an alleged
violation of Environmental  Laws. Except as set forth in the VIDEO SEC Documents
or in  Section  5.8 of the  VIDEO  Disclosure  Schedule  or as  contemplated  or
permitted  by this  Agreement,  VIDEO holds all permits,  licenses,  exemptions,
orders and approvals of governmental  and regulatory  authorities  necessary for
the conduct of its businesses, as now being conducted,  except where the failure
to hold permits,  licenses,  exemptions,  orders and approvals  would not have a
Material Adverse Effect on VIDEO.

                  5.9 Absence of Certain  Changes.  Except as  disclosed  in the
VIDEO SEC Documents or in Section 5.9 of the VIDEO  Disclosure  Schedule,  since
June 30,  1996  through  the date of this  Agreement,  VIDEO has  conducted  its
business  only in the  ordinary  course  and there has not been (a) any  changes
which  could  have a  Material  Adverse  Effect on VIDEO;  (b) any  declaration,
setting  aside or payment of any dividend or payment in cash,  stock or property
or  other   distribution   with  respect  to  VIDEO's  capital  stock;  (c)  any
reclassification, combination, split, subdivision, redemption, purchase or other
acquisition,  directly or indirectly,  of any of VIDEO's capital stock;  (d) any
material change in VIDEO's accounting  principles,  practices or methods; or (e)
any material  alteration  in the  character or conduct of VIDEO's  business from
that conducted and contemplated as of June 30, 1996.

                  5.10 No Undisclosed  Liabilities.  Except (a) for  liabilities
incurred  in the  ordinary  course of  business,  (b)  liabilities  incurred  in
connection with the transactions contemplated by this Agreement, (c) liabilities
which would not have a Material Adverse Effect on VIDEO,  SENTRY, VMC or SMC and
(d) as disclosed  in the VIDEO SEC  Documents or as set forth in Section 5.10 of
the  VIDEO  Disclosure  Schedule,  from  June 30,  1996  until  the date of this
Agreement,  VIDEO, SENTRY, VMC and SMC had not incurred any material liabilities
that would be required to be  reflected  in or reserved  against a  consolidated
balance sheet of VIDEO prepared in accordance with generally accepted accounting
principles.

                  5.11  Litigation.   Except  as  disclosed  in  the  VIDEO  SEC
Documents  or in Section  5.11 of the VIDEO  Disclosure  Schedule,  there are no
claims,  actions,  proceedings or governmental  investigations  pending, nor has
VIDEO, SENTRY, VMC or SMC received





                                       27

<PAGE>



notice  of  any  threatened,   claims,  actions,   proceedings  or  governmental
investigations against VIDEO, SENTRY, VMC or SMC by or before any court or other
governmental or regulatory body,  which, if adversely  determined,  would have a
Material Adverse Effect on VIDEO, SENTRY, VMC or SMC. Neither VIDEO, SENTRY, VMC
or SMC nor their respective assets is subject to any outstanding and unsatisfied
order, writ, judgment,  injunction or decree which would have a Material Adverse
Effect on VIDEO, SENTRY, VMC or SMC.

                  5.12 Employee Benefit Matters.  All employee benefit plans and
other  benefit  arrangements  covering  employees  of VIDEO (the "VIDEO  Benefit
Plans") are listed in Section 5.12 of the VIDEO Disclosure Schedule, except such
benefit plans and other benefit  arrangements  which are not material.  True and
complete copies of the VIDEO Benefit Plans have been made available to KNOGO. To
the extent  applicable,  the VIDEO Benefit Plans comply in all material respects
with the requirements of ERISA, the Code, and any VIDEO Benefit Plan intended to
be qualified  under Section 401(a) of the Code has been determined by the IRS to
be so  qualified.  No  VIDEO  Benefit  Plan is  covered  by Title IV of ERISA or
Section 412 of the Code.  VIDEO has not incurred any  liability or penalty under
Section  4975 of the Code or Section  502(i) of ERISA with  respect to any VIDEO
Benefit Plan,  except as would not have a Material Adverse Effect on VIDEO. Each
VIDEO Benefit Plan has been maintained and administered in all material respects
in  compliance  with  its  terms  and  with  ERISA  and the  Code to the  extent
applicable  thereto.  To the Knowledge of VIDEO,  there are no pending,  nor has
VIDEO received notice of any threatened,  claims against or otherwise  involving
any of the VIDEO  Benefit  Plans,  except as would not have a  Material  Adverse
Effect on VIDEO. All material  contributions  required to be made as of the date
this  Agreement  to the VIDEO  Benefit  Plans  have been made or  provided  for.
Neither  VIDEO nor any entity  under  "common  control"  with  VIDEO  within the
meaning  of  Section  4001 of ERISA  has  contributed  to, or been  required  to
contribute  to, any  "multi-employer  plan" (as  defined in  Sections  3(37) and
4001(a)(3) of ERISA).

                  5.13 Taxes.  Except as disclosed in the VIDEO SEC Documents or
in  Section  5.13  of the  VIDEO  Disclosure  Schedule,  VIDEO  and  each of its
subsidiaries (a) have filed all federal,  state and foreign tax returns required
to be filed by VIDEO or any of its subsidiaries for tax years ended prior to the
date of this  Agreement,  except for those tax  returns  the failure of which to
file would not have a Material Adverse Effect on VIDEO or for which requests for
extensions  have been timely  filed,  and all such  returns are  complete in all
material  respects,  (b) have  paid or  accrued  all  taxes  shown to be due and
payable  on such  returns,  (c) have  accrued  all such  taxes for such  periods
subsequent to the periods covered by such returns ending on or prior to the date
hereof and (d) have  "open"  years for federal  income tax  returns  only as set
forth in the VIDEO SEC  Documents  or in  Section  5.13 of the VIDEO  Disclosure
Schedule. There are no liens for taxes on the





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<PAGE>



assets of VIDEO or any of its subsidiaries, except for liens that would not have
a Material  Adverse Effect on VIDEO,  and there is no pending,  nor has VIDEO or
any  of  its  subsidiaries  received  notice  of  any  threatened,   tax  audit,
examination, refund litigation or adjustment in controversy which, if determined
adversely,  would have a Material Adverse Effect on VIDEO. Neither VIDEO nor any
of its subsidiaries is a party to any agreement  providing for the allocation or
sharing of taxes.

                  5.14 Intellectual  Property.  To the Knowledge of VIDEO, VIDEO
owns or possesses rights in all patents, trademarks,  tradenames, copyrights and
other  intellectual  property  rights  used in or  necessary  for the conduct of
VIDEO's business as now operated (collectively,  "VIDEO Intellectual Property"),
except where the failure to own or possess any such VIDEO Intellectual  Property
would not have a Material  Adverse  Effect on VIDEO.  VIDEO has not received any
notice that VIDEO's products or its use thereof  violate,  infringe or otherwise
conflict  with the  intellectual  property  of third  parties,  except  for such
violations,  infringements  or conflicts that would not have a Material  Adverse
Effect on VIDEO or as disclosed in the VIDEO SEC Documents or in Section 5.14 of
the VIDEO Disclosure Schedule.

                  5.15 Labor Matters.  VIDEO is not a party to, or bound by, any
collective  bargaining  agreement,  contract or other agreement or understanding
with a labor  union or  labor  union  organization.  There  is no  unfair  labor
practice or labor arbitration  proceeding pending or, to the Knowledge of VIDEO,
threatened  against  VIDEO  relating  to  its  business,  except  for  any  such
proceeding that would not have a Material Adverse Effect on VIDEO.

                  5.16 Brokers and Finders. No broker, finder or investment bank
has acted  directly or indirectly for either of VIDEO,  SENTRY,  VMC or SMC, nor
has either of VIDEO,  SENTRY,  VMC or SMC  incurred  any  obligation  to pay any
brokerage,   finder's  or  other  fee  or  commission  in  connection  with  the
transactions  contemplated  hereby,  other than Alex. Brown & Sons  Incorporated
("Alex Brown"), the fees and expenses of which shall be borne by VIDEO.

                  5.17  Opinion  of  Financial  Advisor.   Alex  Brown,  VIDEO's
financial advisor, has delivered its opinion,  dated the date of this Agreement,
to the VIDEO  Board to the  effect  that,  as of such  date,  the  VIDEO  Merger
Consideration  is fair,  from a financial point of view, to the holders of VIDEO
Shares.

                  5.18 Section 351/Reorganization  Treatment.  Neither VIDEO nor
any VIDEO subsidiary has taken or failed to take any action or has any knowledge
of any fact or circumstance  that is reasonably  likely to (i) prevent the VIDEO
Merger from  qualifying  as at least one of (A) a  reorganization  described  in
Section  368(a) of the Code or (B) an  exchange  governed  by Section 351 of the
Code, or (ii)





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<PAGE>



prevent the KNOGO Merger from qualifying as an exchange  governed by Section 351
of the Code.

                  5.19 KNOGO  Shares  Ownership.  Except as disclosed in Section
5.19 of the VIDEO Disclosure  Schedule,  neither VIDEO nor any of its affiliates
or subsidiaries owns any KNOGO Shares or other securities or rights convertible,
exchangeable or otherwise exercisable into KNOGO Shares.

                  5.20 Operations of SENTRY,  VMC and SMC.  SENTRY,  VMC and SMC
have  been  formed  solely  for the  purpose  of  engaging  in the  transactions
contemplated  hereby  and prior to the  Effective  Time will have  engaged in no
other business activities.


                                   ARTICLE VI

                                    COVENANTS

                  6.1  Conduct of the  Business  of KNOGO and VIDEO  Pending the
Reorganization. From the date hereof until the Effective Time, each of KNOGO and
VIDEO shall use commercially  reasonable  efforts to conduct its business in all
material respects only in the ordinary course consistent with past practice, and
to preserve intact its business  organization and keep available the services of
its present key officers and employees (provided,  that to satisfy the foregoing
obligation,  KNOGO and VIDEO shall not be required to make any payments or enter
into or amend any  contractual  arrangements  or  understandings,  except in the
ordinary  course of  business  consistent  with past  practice)  and,  except as
otherwise required by applicable law or as set forth in Section 6.1 of the KNOGO
Disclosure  Schedule  or the  VIDEO  Disclosure  Schedule,  as the  case may be,
neither KNOGO nor VIDEO shall,  without the prior  written  consent of the other
party (which consent shall not be unreasonably withheld):

                  (a) amend its Articles or  Certificate  of  Incorporation,  as
         amended, as the case may be, or By-Laws;

                  (b)   declare,   set  aside  or  pay  any  dividend  or  other
         distribution  or payment in cash,  stock or  property in respect of its
         capital stock,  or  reclassify,  combine,  split,  subdivide or redeem,
         purchase  or  otherwise  acquire,  directly or  indirectly,  any of its
         capital stock;

                  (c) issue,  grant, sell or pledge or agree to or authorize the
         issuance, grant, sale or pledge of any shares of, or rights of any kind
         to acquire any shares of, its capital  stock other than KNOGO Shares or
         VIDEO Shares issuable upon the exercise of Stock Options and Warrants;






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<PAGE>



                  (d) in the case of VIDEO,  sell, assign or otherwise  transfer
         the shares of SENTRY Common Stock held by VIDEO;

                  (e) acquire,  sell,  transfer,  lease or encumber any material
         assets except in the ordinary course of business;

                  (f) adopt a plan of complete or partial  liquidation  or adopt
         resolutions   providing  for  the  complete  or  partial   liquidation,
         dissolution, consolidation, merger, restructuring or recapitalization;

                  (g) grant any severance or  termination  pay to, or enter into
         any  employment  agreement  with,  any of  its  executive  officers  or
         directors, other than in the ordinary course of business;

                  (h) except in the ordinary  course of  business,  increase the
         compensation  payable or to become payable to its executive officers or
         employees,  enter into any  contract  or other  binding  commitment  in
         respect of any such  increase  (other than  pursuant to a KNOGO Benefit
         Plan or VIDEO  Benefit Plan, as the case may be, or policy or agreement
         existing  as of the  date  hereof)  to,  or enter  into  any  severance
         agreement  with  any of its  directors,  executive  officers  or  other
         employees,  or  establish,  adopt,  enter into,  make any new grants or
         awards under or amend, any KNOGO Benefit Plan or VIDEO Benefit Plan, as
         the case may be,  except as required by applicable  law,  including any
         obligation to engage in good faith collective  bargaining,  to maintain
         tax-qualified status or as may be required by any KNOGO Benefit Plan or
         VIDEO Benefit Plan as of the date hereof;

                  (i) settle or compromise any material claims or litigation or,
         except in the ordinary course of business,  modify,  amend or terminate
         any of its material contracts or waive,  release or assign any material
         rights or  claims,  or make any  payment,  direct or  indirect,  of any
         material   liability  before  the  same  becomes  due  and  payable  in
         accordance with its terms;

                  (j) take any  action,  other  than in the  ordinary  course of
         business,  with respect to accounting policies or procedures (including
         tax accounting  policies and procedures),  except as may be required by
         law or generally accepted accounting principles;

                  (k) make any  material  tax  election  or permit any  material
         insurance  policy naming it as a beneficiary or a loss payable payee to
         be canceled or terminated,  except in the ordinary  course of business;
         and






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<PAGE>



                      (l)      authorize or enter into an agreement to do any of
         the foregoing.

                  6.2  Access;  Confidentiality.  (a)  From  the  date  of  this
Agreement until the Effective  Time,  upon  reasonable  prior notice to VIDEO or
KNOGO,  as the case may be,  VIDEO and KNOGO  shall give one  another  and their
respective authorized  representatives  reasonable access during normal business
hours to their respective executive officers, properties, books and records, and
shall furnish one another and their respective  authorized  representatives with
such  financial  and  operating  data  and  other  information   concerning  the
businesses and properties of VIDEO and KNOGO as VIDEO and KNOGO may from time to
time reasonably request.

                  (b) Each of VIDEO,  SENTRY,  VMC,  SMC and KNOGO will hold and
treat,   and  will  cause  their   respective   affiliates,   agents  and  other
representatives  to hold and treat,  all  documents and  information  concerning
VIDEO,  SENTRY,  VMC, SMC or KNOGO, as the case may be, furnished to one another
or  their  respective   representatives  in  connection  with  the  transactions
contemplated   by  this   Agreement   confidential   in   accordance   with  the
Confidentiality  Agreements  dated July 11, 1996 and September 6, 1996,  between
KNOGO and VIDEO, which Confidentiality Agreements shall remain in full force and
effect until termination in accordance with their terms.

                  6.3  Meetings  of  Stockholders.  Each of VIDEO and KNOGO will
take all action necessary in accordance with applicable law and the Certificates
or Articles of Incorporation, as the case may be, and By-Laws of VIDEO and KNOGO
to convene a meeting of its  stockholders as promptly as practicable to consider
and vote upon the approval of this Agreement and the  transactions  contemplated
hereby.  The Board of Directors of each of VIDEO and KNOGO shall  recommend such
approval  and VIDEO and KNOGO shall each take all lawful  action to solicit such
approval,  including,  without  limitation,  timely  mailing of the Joint  Proxy
Statement/Prospectus;  provided,  that such  recommendation  or  solicitation is
subject to any action (including any withdrawal or change of its recommendation)
taken by,  or upon  authority  of,  the  KNOGO  Board or the VIDEO  Board in the
exercise  of  its  good  faith  judgment  as to  its  fiduciary  duties  to  its
stockholders  imposed by law. VIDEO, as sole stockholder of SENTRY,  and SENTRY,
as sole  stockholder  of VMC and SMC,  shall as  promptly  as  practicable  duly
approve this Agreement and the transactions contemplated hereby.

                  6.4 Reasonable Efforts. Subject to the terms and conditions of
this Agreement and  applicable  law, each of the parties shall act in good faith
and use  commercially  reasonable  efforts  to take,  or cause to be taken,  all
actions,  and to do,  or cause to be  done,  all  things  necessary,  proper  or
advisable to consummate and make effective the transactions contemplated by this
Agreement as soon as practicable,  including such actions or things as any other
party may reasonably request in order to cause any of





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<PAGE>



the conditions to such other party's  obligation to consummate the  transactions
contemplated  by this  Agreement  to be fully  satisfied.  Without  limiting the
foregoing, the parties shall (and shall cause their respective subsidiaries, and
use  commercially  reasonable  efforts  to cause  their  respective  affiliates,
directors,    officers,   employees,   agents,   attorneys,    accountants   and
representatives,  to) consult and fully cooperate with and provide assistance to
each other in (a) the  preparation  and filing  with the SEC of the Joint  Proxy
Statement/Prospectus,  and any necessary  amendments or supplements thereto; (b)
seeking to have the Joint Proxy Statement/Prospectus  cleared by the SEC as soon
as reasonably  practicable after filing;  (c) obtaining all necessary  consents,
approvals,   waivers,   licenses,   permits,   authorizations,    registrations,
qualifications,  or other  permission  or action by,  and  giving all  necessary
notices  to  and  making  all  necessary   filings  with  and  applications  and
submissions  to,  any  court,  administrative  agency  or  commission  or  other
governmental  authority or instrumentality,  domestic or foreign  (collectively,
"Governmental  Entity"),  or  other  person  or  entity  as soon  as  reasonably
practicable  after filing;  (d) seeking early  termination of any waiting period
under the HSR Act; (e) providing all such information concerning such party, its
subsidiaries and its officers, directors, partners and affiliates and making all
applications  and  filings  as may  be  necessary  or  reasonably  requested  in
connection with any of the foregoing;  (f) in general,  consummating  and making
effective the transactions  contemplated hereby; and (g) in the event and to the
extent  required,  amending  this  Agreement so that this  Agreement,  the KNOGO
Merger and the VIDEO Merger comply with the DGCL and the Minnesota Act. Prior to
making any application to or filing with any Governmental Entity or other person
or entity in  connection  with this  Agreement  (other than filing under the HSR
Act),  each party shall  provide the other party with drafts  thereof and afford
the other party a reasonable opportunity to comment on such drafts.

                  6.5 Public  Announcements.  KNOGO, VIDEO,  SENTRY, VMC and SMC
will consult with one another  prior to issuing any release or otherwise  making
any public statements with respect to the transactions  contemplated  hereby and
shall not issue any such press  release or make any  public  statement  prior to
such  consultation,  except as may be required by applicable  law or any listing
agreement with a national securities exchange by which such party is bound.

                  6.6 Acquisition Proposals. Except as contemplated hereby, each
of KNOGO and VIDEO agree not to (and shall use  reasonable  efforts to cause its
officers,   directors  and  employees  and  any  investment  banker,   attorney,
accountant,  or  other  agent  retained  by it  not  to)  solicit,  directly  or
indirectly,  any proposal or offer to acquire all or any significant part of its
business and  properties or its capital  stock,  whether by merger,  purchase of
assets, tender offer or otherwise (an "Acquisition





                                       33

<PAGE>



Proposal" and, any such  transaction,  an "Acquisition  Transaction") or provide
any non-public  information concerning the respective company to any third party
in connection with an Acquisition Proposal. Notwithstanding the foregoing, KNOGO
and VIDEO may furnish  information or cause  information to be furnished to, and
may  participate  in  discussions  and  negotiations  directly or through  their
respective   representatives   and  enter  into  an  agreement  relating  to  an
Acquisition  Proposal with, any third party  (including  parties with whom KNOGO
and VIDEO or their respective  representatives have had discussions on any basis
on or prior to the date  hereof) who makes an  unsolicited  proposal or offer to
it, if the KNOGO Board or VIDEO Board,  as the case may be,  determines  in good
faith,  after  consultation  with outside counsel,  that the failure to consider
such  proposal or offer could  reasonably  be deemed to cause its  directors  to
breach  their  fiduciary  duties  under  applicable  law. In  addition,  nothing
contained in this Agreement  shall prohibit KNOGO or VIDEO and their  respective
directors from (a) issuing a press release or otherwise publicly  disclosing the
terms of any Acquisition Proposal, (b) taking and disclosing to its stockholders
any  position,  and making  related  filings  with the SEC, as required by Rules
14e-2 and 14d-9 under the  Exchange  Act with respect to any tender offer or (c)
taking any action and making any disclosure to its stockholders  which the KNOGO
Board  or VIDEO  Board,  as the case may be,  determines  in good  faith,  after
consultation with outside counsel,  would likely be required to be taken or made
under  applicable  law  (including,  without  limitation,  laws  relating to the
fiduciary  duties  of  directors).  In the  event  KNOGO  or VIDEO  receives  an
Acquisition Proposal, it shall promptly inform the other party as to the receipt
of such Acquisition Proposal, unless the KNOGO Board or VIDEO Board, as the case
may be, determines,  after  consultation with outside counsel,  that giving such
notice  could  reasonably  be  deemed  to cause its  directors  to breach  their
fiduciary duties under applicable law.

                  6.7     Registration     Statement     and     Joint     Proxy
Statement/Prospectus.  KNOGO and VIDEO shall promptly furnish all information as
may be required for  inclusion in the  Registration  Statement on Form S-4 to be
filed with the SEC in  connection  with the issuance of shares of SENTRY  Common
Stock in the Reorganization  (the "Registration  Statement") and the joint proxy
statement/prospectus   which  will  form  a  part   thereof  (the  "Joint  Proxy
Statement/Prospectus"). VIDEO and KNOGO shall cooperate and promptly prepare and
VIDEO shall file with the SEC as soon as practicable the Registration  Statement
under the Securities  Act. VIDEO shall use  reasonable  efforts,  and KNOGO will
cooperate with VIDEO, to have the Registration  Statement  declared effective by
the SEC as  promptly  as  practicable.  VIDEO  shall use  reasonable  efforts to
obtain, prior to the effective date of the Registration Statement, all necessary
state  securities law or "blue sky" permits or approvals  required to consummate
the  transactions  contemplated by this  Agreement.  If at any time prior to the
Effective Time, any





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<PAGE>



information  pertaining  to KNOGO  or VIDEO  contained  in or  omitted  from the
Registration  Statement makes such  information  false or misleading,  KNOGO and
VIDEO shall  promptly  inform the other party and provide  such other party with
information  necessary to make the statements  contained therein not misleading.
No amendment or supplement to the Joint Proxy  Statement/Prospectus will be made
by VIDEO or KNOGO without the approval of the other party.

                  6.8  Listing  Application.  VIDEO shall  promptly  prepare and
submit  to  NASDAQ,  or  another  nationally   recognized  exchange,  a  listing
application  covering  the  shares  of  SENTRY  Common  Stock  issuable  in  the
Reorganization, and shall use its best efforts to obtain, prior to the Effective
Time, approval for the listing of such SENTRY Common Stock,  subject to official
notice of issuance.

                  6.9  Affiliate  Letters.  (a) At  least  30 days  prior to the
Closing  Date,  KNOGO shall  deliver to VIDEO a list of names and  addresses  of
those persons who were, in KNOGO's reasonable  judgment,  at the record date for
the KNOGO  Stockholders'  Meeting,  "affiliates"  of KNOGO (each such person,  a
"KNOGO  Affiliate")  within the meaning of Rule 145 of the rules and regulations
promulgated  under the  Securities  Act.  KNOGO  shall  provide  VIDEO with such
information  and  documents  as VIDEO shall  reasonably  request for purposes of
reviewing such list.  KNOGO shall use reasonable  efforts to deliver or cause to
be  delivered  to  VIDEO,  prior to the  Closing  Date,  from  each of the KNOGO
Affiliates  identified  in the foregoing  list, an Affiliate  Letter in the form
attached  hereto as Exhibit C.  SENTRY  shall be  entitled  to place  legends as
specified in such Affiliate  Letters on the  certificates  evidencing any SENTRY
Common  Stock to be received by such KNOGO  Affiliates  pursuant to the terms of
this  Agreement,  and to issue  appropriate  stop transfer  instructions  to the
transfer  agent for the SENTRY Common Stock,  consistent  with the terms of such
Affiliate Letters.

                  (b) At least 30 days prior to the  Closing  Date,  VIDEO shall
deliver to KNOGO a list of names and  addresses  of those  persons who were,  in
VIDEO's reasonable judgment, at the record date for VIDEO Stockholders' Meeting,
"affiliates" of VIDEO (each such person, a "VIDEO Affiliate") within the meaning
of Rule 145 of the rules and regulations  promulgated  under the Securities Act.
VIDEO shall  provide  KNOGO with such  information  and documents as KNOGO shall
reasonably  request  for  purposes  of  reviewing  such  list.  VIDEO  shall use
reasonable  efforts to deliver or cause to be delivered  to KNOGO,  prior to the
Closing  Date,  from each of the VIDEO  Affiliates  identified  in the foregoing
list, an Affiliate Letter in the form attached hereto as Exhibit C. SENTRY shall
be entitled  to place  legends as  specified  in such  Affiliate  Letters on the
certificates  evidencing  any SENTRY  Common  Stock to be received by such VIDEO
Affiliates  pursuant to the terms of this  Agreement,  and to issue  appropriate
stop transfer instructions to the transfer





                                       35

<PAGE>



agent for the SENTRY Common Stock,  consistent  with the terms of such Affiliate
Letters.

                  6.10 D&O Indemnification and Insurance. (a) From the Effective
Time  through  the later of (i) the sixth  anniversary  of the date on which the
Effective  Time occurs and (ii) the  expiration  of any  statute of  limitations
applicable to any claim, action, suit,  proceeding or investigation  referred to
below,  SENTRY shall, or shall cause the VIDEO  Surviving  Corporation and KNOGO
Surviving  Corporation  to,  indemnify and hold harmless each present and former
officer,  director,  employee  or agent of KNOGO and VIDEO,  including,  without
limitation,   each  person   controlling  any  of  the  foregoing  persons  (the
"Indemnified  Parties"),  against  all  claims,  losses,  liabilities,  damages,
judgments,  fines,  fees,  costs or  expenses,  including,  without  limitation,
attorneys'  fees  and  disbursements   (collectively,   "Costs"),   incurred  in
connection with any claim,  action, suit,  proceeding or investigation,  whether
civil, criminal,  administrative or investigative,  arising out of or pertaining
to matters  existing or occurring at or prior to the Effective Time  (including,
without limitation, this Agreement and the transactions and actions contemplated
hereby),  whether  asserted or claimed prior to, at or after the Effective Time,
to the fullest extent  permitted  under  applicable  law and the  Certificate of
Incorporation,  as amended, or By-Laws of KNOGO or indemnification agreements in
effect on the date  hereof,  including  provisions  relating to  advancement  of
expenses  incurred  in the defense of any claim,  action,  suit,  proceeding  or
investigation.  Without  limiting  the  foregoing,  in the event that any claim,
action,  suit,  proceeding or  investigation  is brought  against an Indemnified
Party (whether  arising  before or after the Effective  Time),  the  Indemnified
Party may retain counsel  satisfactory  to such  Indemnified  Party,  and SENTRY
shall,  or shall  cause  the VIDEO  Surviving  Corporation  and KNOGO  Surviving
Corporation  to,  advance  the  fees  and  expenses  of  such  counsel  for  the
Indemnified  Party in  accordance  with the  Certificate  of  Incorporation,  as
amended, or By-Laws of KNOGO in effect on the date of this Agreement.

                  (b)  SENTRY  shall,   or  shall  cause  the  VIDEO   Surviving
Corporation  and  KNOGO  Surviving  Corporation,   to  keep  in  effect  in  its
Certificate  of  Incorporation  and Bylaws,  provisions  of KNOGO  providing for
exculpation  of director and officer  liability and its  indemnification  of the
Indemnified  Parties  to the  fullest  extent  permitted  under the DGCL,  which
provisions  shall not be amended  except as required by applicable law or except
to make changes  permitted by law that would  enlarge the  Indemnified  Parties'
right to indemnification.

                  (c) SENTRY shall maintain,  or shall cause the VIDEO Surviving
Corporation and KNOGO Surviving Corporation to maintain, with respect to matters
occurring at, prior to or subsequent to the Effective Time, at no expense to the
beneficiaries,  directors' and officers',  liability insurance ("D&O Insurance")
for the





                                       36

<PAGE>



Indemnified  Parties,  issued by a carrier or carriers  assigned a claims-paying
ability  rating by A.M. Best & Co. of "A  (Excellent)"  or higher,  providing at
least the same coverage as the D&O Insurance  currently  maintained by KNOGO and
containing   terms  and   conditions   which  are  no  less   favorable  to  the
beneficiaries,  for a period of at least six years from the  Effective  Time. In
the event any claim is made  against  present or former  directors,  officers or
employees of KNOGO or VIDEO that is covered or potentially covered by insurance,
neither  SENTRY,  the  VIDEO  Surviving  Corporation  nor  the  KNOGO  Surviving
Corporation shall do anything that would forfeit, jeopardize,  restrict or limit
the  insurance  coverage  available  for that claim until the final  disposition
thereof.

                  (d)  Notwithstanding  anything herein to the contrary,  if any
claim, action, suit, proceeding or investigation  (whether arising before, at or
after the Effective Time) is made against any Indemnified  Party, on or prior to
the sixth anniversary of the Effective Time, the provisions of this Section 6.10
shall  continue in effect  until the final  disposition  of such claim,  action,
suit, proceeding or investigation.

                  (e) This  covenant  is  intended to be for the benefit of, and
shall be enforceable  by, each of the Indemnified  Parties and their  respective
heirs and legal representatives.  The indemnification  provided for herein shall
not be deemed  exclusive  of any other rights to which an  Indemnified  Party is
entitled,  whether pursuant to law, contract or otherwise.  SENTRY shall pay all
expenses,  including  attorneys'  fees,  that may be incurred by any Indemnified
Party in enforcing  the  indemnity  and other  obligations  provided for in this
Section 6.10.

                  (f)  In  the  event  that   SENTRY  or  the  VIDEO   Surviving
Corporation  or the  KNOGO  Surviving  Corporation  or any of  their  respective
successor or assigns (i)  consolidates  with or merges into any other Person and
shall  not  be the  continuing  or  surviving  corporation  or  entity  of  such
consolidation or merger or (ii) transfers or conveys all or substantially all of
its  properties  and assets to any Person,  then,  and in each such case, to the
extent  necessary  to  effectuate  the  purposes of this  Section  6.10,  proper
provision  shall be made so that the  successors  and  assigns  of SENTRY or the
VIDEO Surviving  Corporation or the KNOGO Surviving Corporation shall succeed to
the obligations set forth in this Section 6.10 and none of the actions described
in clauses (i) or (ii) shall be taken until such provision is made.

                  6.11 Employee Benefits. (a) From and after the Effective Time,
SENTRY, the VIDEO Surviving  Corporation and the KNOGO Surviving Corporation and
their  respective  affiliates  will honor in  accordance  with  their  terms all
existing employment,  severance,  consulting and salary continuation  agreements
(i)  between  KNOGO  and  any of its  current  or  former  officers,  directors,
employees or consultants, and (ii) between VIDEO and any





                                       37

<PAGE>



of its current or former officers, directors, employees or consultants.

                  (b) SENTRY agrees that,  for a three (3) year period after the
Effective  Time,  SENTRY  shall  provide,  or shall  cause the  VIDEO  Surviving
Corporation and the KNOGO Surviving  Corporation to provide,  those persons who,
prior to the Effective  Time,  were  employees of KNOGO ("KNOGO  Employees")  or
VIDEO  ("VIDEO  Employees")  with  employee  plans and  programs  which  provide
benefits that are no less  favorable in the aggregate to those provided to other
employees of SENTRY of  comparable  status and  seniority.  With respect to such
benefits, past service, compensation and expense credits of such KNOGO Employees
and VIDEO  Employees  shall be  recognized  for all  purposes  under  such plans
(including,   but  not  limited  to,  participation,   eligibility  vesting  and
calculation  benefits),  and each  employee  or fringe  benefit  plan or program
available to KNOGO Employees or VIDEO Employees as contemplated  hereby shall be
applied to such KNOGO Employees and VIDEO Employees, respectively.

                  (c)  In  the  event  that   SENTRY  or  the  VIDEO   Surviving
Corporation  or the  KNOGO  Surviving  Corporation  or any of  their  respective
successors or assigns (i) consolidates  with or merges into any other Person and
shall  not  be the  continuing  or  surviving  corporation  or  entity  of  such
consolidation or merger or (ii) transfers or conveys all or substantially all of
its  properties  and assets to any Person,  then,  and in each such case, to the
extent  necessary  to  effectuate  the  purposes of this  Section  6.11,  proper
provision  shall be made so that the  successors  and  assigns  of SENTRY or the
VIDEO Surviving  Corporation or the KNOGO Surviving Corporation shall succeed to
the obligations set forth in this Section 6.11 and none of the actions described
in clauses (i) or (ii) shall be taken until such provision is made.

                  6.12 Fees and Expenses. (a) Whether or not the VIDEO Merger or
the KNOGO Merger is consummated,  all costs and expenses  incurred in connection
with this Agreement and the transactions contemplated hereby (including, without
limitation,   fees  and  disbursements  of  counsel,   financial   advisors  and
accountants)  shall be borne by the party  which  incurs  such cost or  expense;
provided,  that if this  Agreement  is  terminated  pursuant to Section 8.1 as a
result of the willful and material  misrepresentation  by a party or the willful
and material breach by a party of any of its covenants or arrangements set forth
herein,  such party shall pay the costs and expenses incurred by the other party
in connection with this  Agreement;  and provided,  further,  that all costs and
expenses  related  to  the  preparation,   printing,   filing  and  mailing  (as
applicable)  of the Joint  Proxy  Statement/Prospectus  and all SEC filing  fees
incurred in connection with the Joint Proxy  Statement/Prospectus shall be borne
equally by KNOGO, on the one hand, and VIDEO, on the other hand.






                                       38

<PAGE>



                  (b)(i) Notwithstanding the  foregoing,  provided  that neither
VIDEO,  SENTRY,  VMC nor SMC shall be in breach of their respective  obligations
under this  Agreement,  if (A) the KNOGO  Board  shall  withdraw  or modify in a
manner  adverse to VIDEO its approval or  recommendation  of the KNOGO Merger or
shall have resolved to do any of the  foregoing  pursuant to Section 6.6 and (B)
VIDEO or KNOGO shall have terminated  this Agreement  pursuant to Section 8.1(g)
and (C) within six months of any such termination,  KNOGO shall have consummated
an  Acquisition  Transaction,  then KNOGO  agrees that it will pay, or reimburse
VIDEO for, all reasonable fees and expenses incurred by VIDEO and its affiliates
in connection with the  Reorganization  and the consummation of the transactions
contemplated  by this  Agreement,  in an amount  not to exceed  $750,000  in the
aggregate,  in addition to the amount  otherwise  payable pursuant to the second
proviso contained in Section 6.12(a) above.

                  (ii) Notwithstanding the foregoing,  provided that KNOGO shall
not be in breach of its obligations under this Agreement, if (A) the VIDEO Board
shall  withdraw  or  modify  in a  manner  adverse  to  KNOGO  its  approval  or
recommendation  of the VIDEO  Merger  or shall  have  resolved  to do any of the
foregoing  pursuant to Section 6.6 and (B) KNOGO or VIDEO shall have  terminated
this Agreement  pursuant to Section 8.1(h) and (C) within six months of any such
termination, VIDEO shall have consummated an Acquisition Transaction, then VIDEO
agrees  that it will pay,  or  reimburse  KNOGO  for,  all  reasonable  fees and
expenses   incurred  by  KNOGO  and  its  affiliates  in  connection   with  the
Reorganization  and the  consummation of the  transactions  contemplated by this
Agreement,  in an amount not to exceed $750,000 in the aggregate, in addition to
the amount otherwise payable pursuant to the second proviso contained in Section
6.12(a) above.

                  6.13  Cancellation of SENTRY Common Stock. As of the Effective
Time,  all  authorized  SENTRY Common Stock issued and  outstanding  immediately
prior to the Effective Time shall automatically be canceled and extinguished and
shall cease to exist.


                                   ARTICLE VII

                               CLOSING CONDITIONS

                  7.1  Conditions  to  Obligations  of Each  Party to Effect the
Reorganization.  The  respective  obligations of each party hereto to effect the
VIDEO  Merger  or the  KNOGO  Merger,  respectively,  shall  be  subject  to the
satisfaction at or prior to the Effective Time of the following conditions,  any
or all of which may be waived in accordance with Section 9.7 hereof, in whole or
in part, to the extent permitted by applicable law:






                                       39

<PAGE>



                  (a)  Stockholder  Approval.  This  Agreement  shall  have been
         adopted, and the VIDEO Merger and KNOGO Merger shall have been approved
         in  the  manner  required  by  applicable  law  or  by  the  applicable
         regulations of any stock exchange or other regulatory body, as the case
         may be, by a  majority  vote of the  holders of the  outstanding  VIDEO
         Shares and KNOGO Shares, respectively.

                  (b)  No  Injunction.  No  federal  or  state  governmental  or
         regulatory body or court of competent  jurisdiction shall have enacted,
         issued,   promulgated  or  enforced  any  statute,   rule,  regulation,
         executive order, decree, judgment,  preliminary or permanent injunction
         or other  order  which is in effect  and which  prohibits,  enjoins  or
         otherwise  restrains the  consummation of the VIDEO Merger or the KNOGO
         Merger;  provided,  that the parties shall use commercially  reasonable
         efforts to cause any such decree,  judgment,  injunction or order to be
         vacated or lifted.

                  (c) HSR Act. Any waiting  period under the HSR Act  applicable
         to the Reorganization shall have terminated or otherwise expired.

                  (d) Registration  Statement.  The Registration Statement shall
         have become effective and shall be effective at the Effective Time, and
         no stop order suspending  effectiveness  of the Registration  Statement
         shall have been issued, no action, suit, proceeding or investigation by
         the SEC to suspend the effectiveness  thereof shall have been initiated
         and be continuing,  and all necessary  approvals under state securities
         laws  relating to the issuance or trading of the SENTRY Common Stock to
         be  issued  to VIDEO  and KNOGO  stockholders  in  connection  with the
         Reorganization shall have been received.

                  (e) Listing of SENTRY  Common  Stock.  The SENTRY Common Stock
         and the Sentry Class A Preferred  Stock to be issued to VIDEO and KNOGO
         stockholders, as the case may be, in connection with the Reorganization
         shall have been approved for listing on NASDAQ,  or another  nationally
         recognized exchange, subject only to official notice of issuance.

                  7.2  Conditions  Precedent to the  Obligations  of KNOGO.  The
obligation  of  KNOGO  to  effect  the  KNOGO  Merger  is  also  subject  to the
satisfaction  at or  prior  to the  Effective  Time  of  each  of the  following
additional conditions, unless waived by KNOGO:

                  (a)   Accuracy  of   Representations   and   Warranties.   All
         representations  and  warranties  made by  VIDEO,  SENTRY,  VMC and SMC
         herein shall be true and correct in all material  respects on and as of
         the  Effective  Time,  with the same  force and  effect as though  such
         representations and warranties had been made on and as of the Effective
         Time, except for changes





                                       40

<PAGE>



         permitted   or   contemplated   by  this   Agreement   and  except  for
         representations  and warranties  that are made as of a specific date or
         time, which shall be true and correct in all material  respects only as
         of such specific date or time.

                  (b) Compliance with Covenants.  Each of VIDEO, SENTRY, VMC and
         SMC shall have performed in all material  respects all  obligations and
         agreements,  and complied in all material  respects with all covenants,
         contained in this  Agreement  to be  performed  or complied  with by it
         prior to or on the Effective Time.

                  (c)  Officer's  Certificates.  KNOGO shall have  received such
         certificates  of VIDEO,  SENTRY,  VMC and SMC,  dated the Closing Date,
         signed  by an  executive  officer  of  VIDEO,  SENTRY,  VMC  and SMC to
         evidence  satisfaction  of the  conditions  set forth in this Article V
         (insofar  as  each  relates  to  VIDEO,  SENTRY,  VMC or SMC) as may be
         reasonably requested by KNOGO.

                  (d) Legal  Opinion.  KNOGO shall have  received the opinion of
         Stroock  & Stroock  & Lavan,  special  counsel  to  KNOGO,  based  upon
         reasonably requested representation letters and dated the Closing Date,
         to the effect that the KNOGO Merger will be treated for federal  income
         tax  purposes  as a transfer  of property to SENTRY by holders of KNOGO
         Shares governed by Section 351 of the Code.

                  7.3 Conditions  Precedent to the Obligations of VIDEO, SENTRY,
VMC and  SMC.  The  obligation  of  VIDEO,  SENTRY,  VMC and SMC to  effect  the
Reorganization  is also subject to the satisfaction at or prior to the Effective
Time of each of the following additional conditions, unless waived by VIDEO:

                  (a)   Accuracy  of   Representations   and   Warranties.   All
         representations  and warranties  made by KNOGO herein shall be true and
         correct in all material  respects on and as of the Effective Time, with
         the same force and effect as though such representations and warranties
         had been  made on and as of the  Effective  Time,  except  for  changes
         permitted   or   contemplated   by  this   Agreement   and  except  for
         representations  and warranties  that are made as of a specific date or
         time, which shall be true and correct in all material  respects only as
         of such specific date or time.

                  (b) Compliance with  Covenants.  KNOGO shall have performed in
         all material  respects all obligations and agreements,  and complied in
         all material  respects with all covenants,  contained in this Agreement
         to be  performed  or complied  with by it prior to or on the  Effective
         Time.

                  (c)  Officer's  Certificates.  VIDEO shall have  received such
         certificate of KNOGO, dated the Closing Date, signed by





                                       41

<PAGE>



         an  executive  officer  of  KNOGO  to  evidence   satisfaction  of  the
         conditions  set forth in this  Article V  (insofar  as each  relates to
         KNOGO) as may be reasonably requested by VIDEO.

                  (d) Legal  Opinion.  VIDEO shall have  received the opinion of
         Dewey  Ballantine,  special  counsel to VIDEO,  based  upon  reasonably
         requested  representation  letters and dated the Closing  Date,  to the
         effect that the VIDEO  Merger  will be treated  for federal  income tax
         purposes as a  reorganization  described in Section  368(a) of the Code
         and/or as a transfer of  property to SENTRY by holders of VIDEO  Shares
         governed by Section 351 of the Code.


                                  ARTICLE VIII

                                   TERMINATION

                  8.1  Termination.  This  Agreement may be  terminated  and the
Reorganization  may be  abandoned at any time  (notwithstanding  approval of the
KNOGO  Merger  by  the  stockholders  of  KNOGO  and  the  VIDEO  Merger  by the
stockholders of VIDEO, if required by applicable  provisions of the DGCL and the
Minnesota Act), prior to the Effective Time:

                  (a)  by mutual written consent of KNOGO and VIDEO;

                  (b) by either KNOGO or VIDEO,  if the Effective Time shall not
         have  occurred  on or before 180 days from the date  hereof;  provided,
         that the right to terminate this Agreement  under this clause (b) shall
         not be available to any party whose misrepresentation in this Agreement
         or whose failure to perform any of its  covenants and  agreements or to
         satisfy any  obligation  under this  Agreement has been the cause of or
         resulted  in the  failure of the  Reorganization  to occur on or before
         such date;

                  (c) by either  KNOGO or  VIDEO,  if (i) any  federal  or state
         court of competent  jurisdiction or other federal or state governmental
         or regulatory body shall have issued any judgment, injunction, order or
         decree prohibiting, enjoining or otherwise restraining the transactions
         contemplated by this Agreement and such judgment,  injunction, order or
         decree shall have become final and  nonappealable  (provided,  that the
         party seeking to terminate this  Agreement  pursuant to this clause (c)
         shall  have  used  commercially   reasonable  efforts  to  remove  such
         judgment,  injunction,  order or  decree)  or (ii) any  statute,  rule,
         regulation or executive order  promulgated or enacted by any federal or
         state  governmental  authority  after the date of this Agreement  which
         prohibits the consummation of the Reorganization shall be in effect;






                                       42

<PAGE>



                  (d) by either KNOGO or VIDEO, if this Agreement is not adopted
         or the  VIDEO  Merger  or the  KNOGO  Merger  is  not  approved  by the
         stockholders of VIDEO or KNOGO as required by Section 7.1;

                  (e) by VIDEO,  if there  shall have been a material  breach of
         any  representation,  warranty or material covenant or agreement on the
         part of KNOGO,  which is not cured  after  thirty  (30)  days'  written
         notice by VIDEO to KNOGO; or

                  (f) by KNOGO,  if there  shall have been a material  breach of
         any  representation,  warranty or material covenant or agreement on the
         part of VIDEO,  which is not cured  after  thirty  (30)  days'  written
         notice by KNOGO to VIDEO.

                  (g) by either  VIDEO or KNOGO,  if (i) the KNOGO  Board  shall
         withdraw  or  modify  in a manner  adverse  to VIDEO  its  approval  or
         recommendation  of the KNOGO Merger or shall have resolved to do any of
         the  foregoing  pursuant  to Section 6.6 or (ii) any Person or group of
         Persons  shall have made an  Acquisition  Proposal that the KNOGO Board
         determines in good faith, after consultation with outside counsel, that
         the failure to accept such  Acquisition  Proposal  could  reasonably be
         deemed  to  cause  the  members  of the  KNOGO  Board to  breach  their
         fiduciary duties under applicable law.

                  (h) by either  KNOGO or VIDEO,  if (i) the VIDEO  Board  shall
         withdraw  or  modify  in a manner  adverse  to KNOGO  its  approval  or
         recommendation  of the VIDEO Merger or shall have resolved to do any of
         the  foregoing  pursuant  to Section 6.6 or (ii) any Person or group of
         Persons  shall have made an  Acquisition  Proposal that the VIDEO Board
         determines in good faith, after consultation with outside counsel, that
         the failure to accept such  Acquisition  Proposal  could  reasonably be
         deemed  to  cause  the  members  of the  VIDEO  Board to  breach  their
         fiduciary duties under applicable law.

                  8.2 Effect of Termination.  In the event of any termination of
this Agreement  pursuant to Section 8.1, this Agreement  forthwith  shall become
void and of no  further  force or  effect,  and no party  hereto  (or any of its
affiliates,  directors,  officers,  agents or  representatives)  shall  have any
liability or  obligation  hereunder,  except in any such case (a) as provided in
Sections 6.2(b) (Confidentiality), 6.5 (Public Announcements) and 6.12 (Fees and
Expenses),  which shall survive any such  termination and (b) to the extent such
termination results from the breach by such party of any of its representations,
warranties, covenants or agreements contained in this Agreement.





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<PAGE>





                                   ARTICLE IX

                                  MISCELLANEOUS

                  9.1 Nonsurvival of Representations,  Warranties and Covenants.
None of the  representations,  warranties,  covenants or agreements contained in
this Agreement or in any certificate or other instrument  delivered  pursuant to
this Agreement  shall survive the Effective  Time,  except for the covenants and
agreements   contained  in  Sections  6.2(b)   (Confidentiality),   6.5  (Public
Announcements),   6.10  (D&O  Indemnification  and  Insurance),  6.11  (Employee
Benefits) and 6.12 (Fees and Expenses).

                  9.2  Notices.  All notices and other  communications  given or
made  pursuant  hereto shall be in writing and shall be deemed to have been duly
given or made as of the date  delivered,  mailed  or  transmitted,  and shall be
effective  upon  receipt,  if  delivered  personally,  mailed by  registered  or
certified mail (postage prepaid,  return receipt requested) or sent by fax (with
immediate  confirmation) or nationally  recognized overnight courier service, as
follows:

                  (a)      if to VIDEO, to:

                           Video Sentry Corporation
                           6365 Carlson Drive
                           Eden Prairie, Minnesota 55346

                           Attn: Andrew L. Benson, President
                           Fax:  (612) 965-6472

                           with a copy to:

                           Dewey Ballantine
                           333 South Hope Street, 30th Floor
                           Los Angeles, California 90071
                           Attn: Robert M. Smith
                           Fax: (213) 625-0562

                  (b)      if to KNOGO, to:

                           Knogo North America Inc.
                           350 Wireless Boulevard
                           Hauppauge, Long Island, New York 11788-3907

                           Attn: Thomas A. Nicolette, President
                           Fax:  (516) 232-4750






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<PAGE>



                           with a copy to:

                           Stroock & Stroock & Lavan
                           7 Hanover Square
                           New York, New York 10004
                           Attn: David H. Kaufman
                           Fax: (212) 806-6006

                  (c)      if to SENTRY prior to the Effective Time, to:

                           Sentry Technology Corporation
                           c/o Video Sentry Corporation
                           6365 Carlson Drive
                           Eden Prairie, Minnesota 55346

                           Attn: President
                           Fax:  (612) 975-6472

                           with a copy to:

                           Dewey Ballantine
                           333 South Hope Street, 30th Floor
                           Los Angeles, California 90071
                           Attn: Robert M. Smith
                           Fax: (213) 625-0562

                  (d)      if to SENTRY subsequent to the Effective Time, to:

                           Sentry Technology Corporation
                           c/o Knogo North America Inc.
                           350 Wireless Boulevard
                           Hauppauge, New York 11788-3907

                           Attn: President
                           Fax:  (516) 232-4750

                           with a copy to:

                           Stroock & Stroock & Lavan
                           7 Hanover Square
                           New York, New York 10004
                           Attn: David H. Kaufman
                           Fax: (212) 806-6006

or to such  other  Person or  address  or  facsimile  number as any party  shall
specify by like written notice to the other parties hereto (any such notice of a
change of address to be effective only upon actual receipt thereof).

                  9.3      Certain Definitions.  The following terms, when used
in this Agreement, shall have the following respective meanings:






                                       45

<PAGE>



                  (a) "affiliate"  shall have the meaning  assigned to such term
         in Section 12(b)-2 of the Exchange Act.

                  (b)  "business  day" shall have the  meaning set forth in Rule
         14d-1(c)(6) under the Exchange Act.

                  (c)  "Knowledge"  means the actual  knowledge of the executive
         officers of KNOGO or VIDEO, as the case may be.

                  (d)  "Material  Adverse  Effect"  means,  with  respect to any
         Person,  any  change  or  effect  which is  materially  adverse  to the
         financial  condition  or results of  operations  of such Person and its
         subsidiaries,  taken as a whole,  excluding in all cases: (i) events or
         conditions  generally  affecting  the industry in which such Person and
         its subsidiaries operate or arising from changes in general business or
         economic  conditions;  (ii) any effect resulting from any change in law
         or generally  accepted  accounting  principles,  which affect generally
         entities  such as such  Person;  (iii)  events  resulting  directly  or
         indirectly  from the execution  and/or  announcement of this Agreement,
         including,  without  limitation,  the  cancellation  or postponement of
         customer  orders  or the  absence  of new  customer  sales  during  the
         pendency  of  the  Agreement;   and  (iv)  any  effect  resulting  from
         compliance by such Person with the terms of this Agreement.

                  (e) "Person" means any natural  person,  corporation,  limited
         liability company,  partnership,  unincorporated  organization or other
         entity.

                  (f) "subsidiary" of any Person means any other  corporation or
         entity of which such  Person  owns,  directly or  indirectly,  stock or
         other equity  interests  having a majority of the votes  entitled to be
         cast in the election of directors of such  corporation  or entity under
         ordinary  circumstances  or  of  which  such  Person  owns  a  majority
         beneficial interest.

                  9.4 Entire Agreement. This Agreement (including the schedules,
exhibits  and  other   documents   referred  to  herein),   together   with  the
Confidentiality Agreements referred to in Section 4.2(b), constitutes the entire
agreement  between  and  among  the  parties  hereto  and  supersedes  all prior
agreements  and  understandings,  oral and written,  between or among any of the
parties with respect to the subject matter hereof.

                  9.5 Assignment; Binding Effect. Neither this Agreement nor any
of the rights, benefits or obligations hereunder may be assigned, in whole or in
part, by any party (whether by operation of law or otherwise)  without the prior
written consent of the other parties hereto.  Subject to the preceding sentence,
this Agreement shall be binding upon, inure to the benefit of and be enforceable
by the parties and their respective successors and assigns.





                                       46

<PAGE>



Nothing in this  Agreement,  expressed or implied,  is intended to confer on any
person other than the parties or their  respective  successors and assigns,  any
rights,  remedies,  obligations  or  liabilities  under  or by  reason  of  this
Agreement,  other than rights  conferred  upon third parties under Sections 6.10
and 6.11.

                  9.6  Amendments.  This Agreement may be amended by the parties
at any time prior to the Effective Time; provided,  that, after approval of this
Agreement and either the KNOGO Merger or the VIDEO Merger by the stockholders of
VIDEO or KNOGO if required  under  applicable  law, no  amendment  shall be made
which by law requires  further  approval by the stockholders of VIDEO and KNOGO,
without such approval.  This Agreement may not be amended or modified  except by
an instrument in writing signed on behalf of each of the parties hereto.

                  9.7 Waivers.  At any time prior to the Effective Time,  VIDEO,
on the one hand,  or KNOGO,  on the  other  hand,  may,  to the  extent  legally
allowed,  (a) extend the time specified herein for the performance of any of the
obligations  or other  acts of the  other,  (b)  waive any  inaccuracies  in the
representations  and warranties of the other contained herein or in any document
delivered  pursuant hereto, or (c) waive compliance by the other with any of the
agreements  or  covenants  of such other  party or parties  (as the case may be)
contained herein.  Any such extension or waiver shall be valid only if set forth
in a written  instrument  signed on behalf of the party or  parties  to be bound
thereby.  No such extension or waiver shall  constitute a waiver of, or estoppel
with respect to, any  subsequent  or other breach or failure to strictly  comply
with the  provisions  of this  Agreement.  The failure of any party to insist on
strict compliance with this Agreement or to assert any of its rights or remedies
hereunder or with respect hereto shall not constitute a waiver of such rights or
remedies.

                  9.8  Validity.  The  invalidity  or  unenforceability  of  any
provisions of this Agreement shall not affect the validity or  enforceability of
any other  provisions  of this  Agreement,  which shall remain in full force and
effect.

                  9.9 Captions.  The table of contents and headings contained in
this  Agreement are for reference  purposes only and shall not affect in any way
the meaning or interpretation of this Agreement.

                  9.10   Counterparts.   This   Agreement  may  be  executed  in
counterparts,  each of which shall be deemed to be an original, and all of which
together shall be deemed to be one and the same instrument.

                  9.11      Governing Law.  This Agreement shall be governed by
and construed in accordance with the internal laws of the State of





                                       47

<PAGE>



Delaware, without regard to any applicable principles of conflicts of law.

                                      * * *





                                       48

<PAGE>



                  IN WITNESS WHEREOF, the parties have executed this Amended and
Restated  Agreement and Plan of  Reorganization  and Merger as of the date first
above written.

                                           VIDEO SENTRY CORPORATION


                                           By:    /s/  Robert D. Furst, Jr.
                                           Name:  Robert D. Furst, Jr.
                                           Title: Chairman/CEO



                                           KNOGO NORTH AMERICA INC.


   
                                           By:    /s/  Thomas A. Nicolette
                                           Name:  Thomas A. Nicolette
                                           Title: President & CEO
    



                                           SENTRY TECHNOLOGY CORPORATION


                                           By:    /s/  Robert D. Furst, Jr.
                                           Name:  Robert D. Furst, Jr.
                                           Title: Chairman/CEO



                                           VIKING MERGER CORP.


                                           By:    /s/  Robert D. Furst, Jr.
                                           Name:  Robert D. Furst, Jr.
                                           Title: Chairman/CEO



                                           STRIP MERGER CORP.


                                           By:    /s/  Robert D. Furst, Jr.
                                           Name:  Robert D. Furst, Jr.
                                           Title: Chairman/CEO












<PAGE>



                                    EXHIBIT A

                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                          SENTRY TECHNOLOGY CORPORATION

                            (a Delaware corporation)



         FIRST.  The name of the  corporation is SENTRY  TECHNOLOGY  CORPORATION
(the "Corporation")

         SECOND. The address of the Corporation's registered office in the State
of  Delaware is  Corporation  Trust  Center,  1209  Orange  Street,  Wilmington,
Delaware 19801. The name of the  Corporation's  registered agent at such address
is Corporation Trust Company.

         THIRD. The purpose of the Corporation is to engage in any lawful act or
activity  for which  corporations  may be organized  under the Delaware  General
Corporation Law ("DGCL").

         FOURTH. The total number of shares of stock which the Corporation shall
have the  authority  to issue is one  hundred  million  (100,000,000)  shares of
common stock, par value $0.001 per share (the "Common  Stock"),  and twenty-five
million  (25,000,000) shares of preferred stock, par value $0.001 per share (the
"Preferred  Stock"), of which six million (6,000,000) shares shall be designated
Class A Preferred Stock (the "Class A Preferred  Stock").  Each share of Class A
Preferred Stock shall have a face value of $5.00 (the "Face Value").

I.       Common Stock.

         A  statement  of  the  designations,   powers,   preferences,   rights,
qualifications,  limitations and  restrictions in respect of the Common Stock is
as follows:

         A.  Dividends.  Subject to the provisions of this Article  FOURTH,  the
Board of Directors (the "Board") of the  Corporation  may cause  dividends to be
paid to the holders of shares of Common Stock out of funds legally available for
the payment of dividends by declaring an amount per share as a dividend.

         B.  Liquidation.  Subject to the provisions of this Article FOURTH,  in
the event of any voluntary or involuntary liquidation, dissolution or winding up
of the Corporation, the holders of shares





                                       A-1

<PAGE>



of  Common  Stock  shall be  entitled  to share in all  remaining  assets of the
Corporation available for distribution to its stockholders.

         C. Voting Rights. Subject to the provisions of this Article FOURTH, and
except as  otherwise  required by law,  each  outstanding  share of Common Stock
shall be  entitled  to vote on each  matter  on which  the  stockholders  of the
Corporation  shall be entitled to vote, and each holder of Common Stock shall be
entitled to one vote for each share of such stock held by such holder.

II.      Preferred Stock.

         Shares of the Preferred Stock may be issued from time to time in one or
more  classes  or  series,  each of  which  class  or  series  shall  have  such
distinctive  designation  or title as shall be set  forth  below or fixed by the
Board prior to the issuance of any shares thereof.  Each such class or series of
the Preferred Stock shall be issued for such  consideration  and shall have such
voting powers,  full or limited,  or no voting powers,  and such preferences and
relative   participating   optional   and   other   special   rights   and  such
qualifications,  limitations or restrictions thereof, as shall be stated in such
resolution  providing  for the issue of such  class or  series of the  Preferred
Stock as may be adopted  from time to time by the Board prior to the issuance of
any shares thereof  pursuant to the authority hereby expressly vested in it, all
in  accordance  with the laws of the State of  Delaware.  All  shares of any one
class or series of the Preferred Stock shall be alike in every  particular.  The
Board is further authorized to increase or decrease (but not below the number of
such  shares of series  then  outstanding)  the  number of shares of any  series
subsequent to the issuance of shares of that series.

         Statements   of  the   designations,   powers,   preferences,   rights,
qualifications, limitations and restrictions in respect of the Class A Preferred
Stock are as follows:

         A.       Class A Preferred Stock.

                  1. Rank.  The Class A Preferred  Stock shall,  with respect to
dividend rights and rights on liquidation,  winding up or dissolution,  rank (i)
on parity  with,  or junior to, as the case may be, any other class or series of
Preferred Stock established by the Board, the terms of which shall  specifically
provide that such class or series  shall rank on parity with,  or senior to, the
Class  A  Preferred  Stock  with  respect  to  dividend  rights  and  rights  on
liquidation,  winding up or  dissolution,  and (ii)  except as set forth  below,
prior to any other equity securities of the Corporation with respect to dividend
rights and rights on liquidation,  winding up or dissolution (all of such equity
securities of the  Corporation to which the Class A Preferred Stock ranks prior,
including the Common Stock, are at times collectively  referred to herein as the
"Junior Stock").





                                       A-2

<PAGE>




                  2.       Dividend.

                           (a)     The annual dividend rate on each share of the
Class A Preferred  Stock shall be fixed at five  percent (5%) of the Face Value,
payable in accordance  with this  paragraph 2 (the  "Dividend").  The holders of
shares of the Class A Preferred Stock shall be entitled to receive  Dividends on
the following dates (each, a "dividend payment date"): , 1997/8,
               , 1998/9,                , 1998/9,
                 , 1999/2000,                , 1999/2000 and
               , 2000/2001;  the 12 month period ending on each of the first two
dividend  payment  dates is an "annual  dividend  period,"  the six month period
ending  on each of the  next  four  dividend  payment  dates  is a  "semi-annual
dividend  period" and each such annual dividend  period or semi-annual  dividend
period is a "dividend  period."  Dividends  (whether or not  declared)  shall be
payable  in  additional  shares of the Class A  Preferred  Stock  during the two
annual  dividend  periods  ending  on  the  first  two  dividend  payment  dates
subsequent to issuance of the Class A Preferred  Stock,  such that holders shall
receive a  Dividend  of 1/20th  of a share of Class A  Preferred  Stock for each
share of Class A Preferred Stock held. Thereafter,  the holders of shares of the
Class A Preferred Stock shall be entitled to receive, in preference to dividends
on the Junior  Stock,  and whether or not declared the Dividend  (including  any
Dividend accrued and unpaid) payable in cash, out of funds legally available for
the payment of  dividends,  such that holders  shall receive a Dividend of $0.25
for each share of Class A Preferred  Stock held,  which  Dividend  shall  accrue
semi-annually and be due in equal installments on each of the last four dividend
payment dates.  Dividends shall be paid on the applicable  dividend payment date
to the  holders  of  record at the close of  business  on the date (the  "record
date")  specified by the Board at the time such Dividend is declared;  provided,
however,  that such  record date shall not be more than 60 days nor less than 10
days prior to the  applicable  dividend  payment date.  For the purposes of this
paragraph,  each  additional  share of the Class A Preferred  Stock  issued as a
Dividend shall be valued at the Face Value.  Dividends  (whether payable in cash
or in  stock)  shall be fully  cumulative  and  shall  accrue,  with  additional
payments  thereon,  from the first  day of the  dividend  period  in which  such
Dividend  may be  payable  as  herein  provided  on all  shares  of the  Class A
Preferred Stock issued and outstanding on the first day of such dividend period,
except that with respect to the initial  dividend  period,  such Dividend  shall
accrue from the date of issue.  If the  dividend  payment date is not a business
day, the dividend payment date shall be the next succeeding business day.

                           (b)      All Dividends paid with respect to shares of
the Class A Preferred Stock pursuant to paragraph 2(a) shall be paid pro rata to
the holders entitled thereto.






                                       A-3

<PAGE>



                           (c) If at any time the Corporation  shall have failed
to pay all dividends which have accrued on any  outstanding  shares of any other
class or series of the Preferred Stock having cumulative dividend rights ranking
on  parity  with the  shares of the Class A  Preferred  Stock at the times  such
dividends are payable or the Corporation  shall fail to redeem any of such stock
on the date set for the redemption  thereof,  no cash Dividend shall be declared
by the Board or paid or set apart for  payment by the  Corporation  on shares of
the  Class  A  Preferred  Stock  unless  prior  to  or  concurrently  with  such
declaration,  payment or  setting  apart for  payment,  all  accrued  and unpaid
dividends on all outstanding  shares of such other series of the Preferred Stock
shall have been or be declared,  paid or set apart for payment,  with additional
payments thereon, if any; provided,  however,  that in the event such failure to
pay accrued  dividends  is with respect  only to the  outstanding  shares of the
Class A Preferred Stock and any outstanding  shares of any other class or series
of the  Preferred  Stock having  cumulative  dividend  rights on parity with the
shares of the Class A Preferred Stock,  cash dividends may be declared,  paid or
set apart for payment,  with additional  payment thereon,  pro rata on shares of
the Class A  Preferred  Stock and  shares of such  other  class or series of the
Preferred Stock so that the amounts of any cash dividends declared,  paid or set
apart for  payment on shares of the Class A  Preferred  Stock and shares of such
other  series of the  Preferred  Stock shall in all cases bear to each other the
same ratio that, at the time of such  declaration,  payment or setting apart for
payment,  all  accrued  but  unpaid  cash  dividends  on  shares  of the Class A
Preferred  Stock and shares of such other series of the Preferred  Stock bear to
each other.  Any  Dividend not paid  pursuant to  paragraph  2(a) hereof or this
paragraph  2(c)  shall be fully  cumulative  and shall  accrue  with  additional
payments thereon, as set forth in paragraph 2(a) hereof.

                           (d) (i)  Holders  of shares of the Class A  Preferred
Stock shall be entitled to receive the Dividends  provided for in paragraph 2(a)
hereof in preference to and in priority over any dividends  other than dividends
paid in Junior Stock upon any of the Junior Stock.

                           (ii) So long as any  shares of the Class A  Preferred
         Stock are outstanding,  the Corporation  shall not declare,  pay or set
         apart for payment any  dividend on any of the Junior  Stock (other than
         dividends paid in such Junior Stock) or make any payment on account of,
         or set apart for payment money for a sinking or other similar fund for,
         the  purchase,  redemption  or other  retirement  of, any of the Junior
         Stock or any warrants,  rights, calls or options exercisable for any of
         the Junior Stock, or make any distribution in respect  thereof,  either
         directly or indirectly,  and whether in cash,  obligations or shares of
         the capital  stock of the  Corporation  or other  property  (other than
         distributions or dividends in stock to the holders of such stock),  and
         shall not permit any





                                       A-4

<PAGE>



         corporation  or other entity  directly or indirectly  controlled by the
         Corporation  to  purchase  or  redeem  any of the  Junior  Stock or any
         warrants,  rights,  calls or options  exercisable for any of the Junior
         Stock, unless prior to or concurrently with such declaration,  payment,
         setting apart for payment,  purchase or  distribution,  as the case may
         be,  all  accrued  and  unpaid  cash  Dividends,  including  additional
         payments thereon,  on shares of the Class A Preferred Stock not paid in
         accordance with the provisions of paragraph 2(a) hereof shall have been
         or be paid and the Corporation  shall have redeemed those shares of the
         Class A Preferred  Stock  required to be  redeemed  theretofore  by the
         terms hereof.

                           (e)  Subject  to the  foregoing  provisions  of  this
paragraph 2, the Board may declare and the  Corporation may pay or set apart for
payment  dividends and other  distributions  on any of the Junior Stock, and may
purchase or otherwise redeem any of the Junior Stock or any warrants,  rights or
options  exercisable  for any of the Junior  Stock;  provided,  however,  that a
decision  by the Board to declare a dividend  on any of the Junior  Stock  shall
require approval by that number of directors representing at least 662/3% of the
Board,  less any vacancies on the Board. In such event, the holders of the Class
A  Preferred  Stock and the holders of such  Junior  Stock shall share  equally,
share and share alike, in the distribution of any and all dividends  declared on
such  Junior  Stock,  provided  that  for  this  purpose  each  share of Class A
Preferred Stock shall be treated as one share of such Junior Stock.

                           (f) The  Corporation  shall not be  required to issue
fractional  shares  of Class A  Preferred  Stock as a result of the  payment  of
Dividends.  If any  fraction  of a share of  Class A  Preferred  Stock  would be
issuable upon the payment of a Dividend, the Corporation may, in lieu of issuing
such  fractional  share,  pay to such holder for any such fraction of a share an
amount in cash equal to the product obtained by multiplying (i) such fraction by
(ii) the Face Value.

                           (g)  Whenever,  at any time or  times,  any  Dividend
payable shall be in arrears,  the holders of the  outstanding  shares of Class A
Preferred Stock shall have the right, voting separately as a class, to elect one
director  of the  Corporation.  Upon the vesting of such right of the holders of
Class A Preferred Stock, the maximum  authorized  number of members of the Board
shall  automatically be increased by one and the one vacancy so created shall be
filled by vote of the  holders of the  outstanding  shares of Class A  Preferred
Stock.  The right of the holders of Class A Preferred Stock to elect a member of
the Board as  aforesaid  shall  continue  until  such time as all  Dividends  in
arrears shall have been paid in full, at which time such right shall  terminate,
except as herein or by law expressly provided, subject to revesting in the event
of each and every  subsequent  default of the character  above  described.  Upon
termination of such special voting rights





                                       A-5

<PAGE>



attributable  to  holders  of the  Class  A  Preferred  Stock  pursuant  to this
paragraph,  the term of office of any director  elected by the holders of shares
of Class A  Preferred  Stock  (any such  director,  a "Class A  Preferred  Stock
Director")  pursuant to such special voting rights shall  immediately  terminate
and the number of  directors  constituting  the entire Board shall be reduced by
one.  Any Class A Preferred  Stock  Director may be removed by, and shall not be
removed otherwise than by, a majority vote of the outstanding  shares of Class A
Preferred  Stock. If the office of any Class A Preferred Stock Director  becomes
vacant by reason of death, resignation,  retirement,  disqualification,  removal
from office,  or otherwise,  a successor who shall hold office for the unexpired
term in respect of which such vacancy  occurred  shall be elected by the holders
of the outstanding  shares of Class A preferred  Stock,  voting  separately as a
class.

                  3.       Adjustment of Hurdle Price.

                           (a) To  preserve  the  actual or  potential  economic
value of the  Class A  Preferred  Stock,  if at any time  after the date of this
Amended and Restated  Certificate of Incorporation  (the  "Certificate"),  there
shall be any change in the Common Stock,  whether by reason of stock  dividends,
stock  splits,  recapitalizations,   mergers,  consolidations,  combinations  or
exchanges of securities, split-ups, split-offs,  spin-offs,  liquidations, other
similar changes in capitalization, any distribution or issuance of cash, assets,
evidences of indebtedness or subscription rights, options or warrants to holders
of Common Stock (other than regular cash dividends) or otherwise,  then, in each
such event the Board shall make such appropriate adjustments in the Hurdle Price
(as defined below) such that following  such  adjustments,  such event shall not
have had the effect of increasing, reducing or limiting the benefits the holders
of shares of Class A Preferred Stock would have had absent such event.

                           (b) The "Deemed Value" as used herein shall equal the
Face Value plus the amount by which the Closing  Price  exceeds the Hurdle Price
on the date of the relevant event.  The "Hurdle Price" as used herein shall mean
the  amount  that is the  average  of the  closing  prices for a share of Sentry
Common Stock on the 20 consecutive  trading days ending on the trading date last
preceding the first  anniversary  of the filing of this  Certificate;  provided,
however, that in no event shall the Hurdle Price be less than $5.00 or more than
$6.50,  such that (x) if such average amount is less than $5.00 the Hurdle Price
shall equal $5.00,  and (y) if such average amount is more than $6.50 the Hurdle
Price shall equal $6.50,  subject to  adjustment  pursuant to paragraph 3 above.
The "Closing  Price" as used herein shall mean the average of the closing prices
for a share of Common Stock on the twenty (20)  consecutive  trading days ending
on the trading date last  preceding an optional  redemption  date, the Mandatory
Redemption Date (as defined below),  the date of an event described in paragraph
4(a)





                                       A-6

<PAGE>



above or the closing date of an Acquisition (as defined below),  as the case may
be, as  reported on the  National  Association  of  Securities  Dealers,  Inc.'s
Automated  Quotations  System  ("Nasdaq") or if such closing prices shall not be
reported on Nasdaq, the average of the closing prices,  regular way, for a share
of such security on the  principal  national  securities  exchange on which such
security is listed on such  twenty (20)  consecutive  trading  days,  or if such
security is not listed on any national securities  exchange,  the average of the
mean  between the closing  bid and asked  prices of a share of such  security on
such twenty (20) consecutive  trading days as reported,  or if such prices shall
not be so  reported,  as the same shall be  reported by the  National  Quotation
Bureau,  Incorporated or, in all other cases, the value set in good faith by the
Board.

                  4.       Liquidation Preference.

                           (a) In the  event  of any  voluntary  or  involuntary
liquidation,  dissolution or winding up of the affairs of the  Corporation,  the
holders  of shares of the Class A  Preferred  Stock  then  outstanding  shall be
entitled  to be  paid  out  of  the  assets  of the  Corporation  available  for
distribution to its  stockholders  an amount in cash for each share  outstanding
equal to (i) the  Deemed  Value on the date of such an event plus (ii) an amount
in cash equal to all  accrued  but unpaid  Dividends  thereon,  plus  additional
dividends  on  unpaid  Dividends  accrued  prior  to  the  commencement  of  the
then-current  dividend  period,  to the date fixed for  liquidation,  before any
payment  shall be made or any assets  distributed  to the  holders of any of the
Junior Stock. If the assets of the Corporation are not sufficient to pay in full
the  liquidation  payments  payable to the holders of outstanding  shares of the
Class A  Preferred  Stock and any other class or series of the  Preferred  Stock
having  liquidation  rights on parity  with the shares of the Class A  Preferred
Stock,  then  the  holders  of all  such  shares  shall  share  ratably  in such
distribution  of assets in accordance  with the amount which would be payable on
such  distribution if the amounts to which the holders of outstanding  shares of
the Class A Preferred Stock and the holders of outstanding  shares of such other
series of the Preferred Stock are entitled were paid in full.

                           (b) The  liquidation  payment  with  respect  to each
fractional  share of the Class A Preferred Stock  outstanding,  if any, shall be
equal to a ratably  proportionate amount of the liquidation payment with respect
to each outstanding share of the Class A Preferred Stock.

                           (c) For  purposes of this  paragraph  4,  neither the
voluntary  sale,  conveyance,  exchange or transfer (for cash,  shares of stock,
securities or other  consideration)  of all or substantially all the property or
assets of the  Corporation  nor the  consolidation  or merger of the Corporation
with  one or more  other  corporations  shall  be  deemed  to be a  liquidation,
dissolution or





                                       A-7

<PAGE>



winding up,  voluntary or involuntary,  unless such voluntary sale,  conveyance,
exchange or transfer shall be in connection  with a dissolution or winding up of
the business of the Corporation.

                           (d)  Any  sale,   lease  or   conveyance  of  all  or
substantially all of the Corporation's  assets or merger or consolidation of the
Corporation  which  results  in the  holders of the Common  Stock  receiving  in
exchange  for such  Common  Stock  either  cash or  notes,  debentures  or other
evidences of  indebtedness  or obligations to pay cash or preferred stock of the
surviving  entity  which  ranks on parity  with the Class A  Preferred  Stock in
liquidation  or dividends  shall be deemed to be a  liquidation,  dissolution or
winding  up of the  affairs  of the  Corporation  within  the  meaning  of  this
paragraph 4. In the cases of merger or  consolidation  of the Corporation  where
holders of the Common Stock receive,  in exchange for such Common Stock,  common
stock or preferred  stock which is junior in  liquidation  and  dividends to the
Class A Preferred  Stock in the surviving  entity (whether or not such surviving
entity is the Corporation) of such merger or consolidation or preferred stock of
another  entity,  the Class A Preferred  Stock  shall be deemed to be  preferred
stock of such  surviving  entity or other  entity,  as the case may be, with the
same annual  dividend rate and equivalent  rights to the rights set forth herein
and the merger or  consolidation  agreement shall  expressly so provide.  In the
event of a merger or  consolidation of the Corporation  where the  consideration
received by the holders of the Common Stock consists of two or more of the types
of  consideration  set forth above,  the holders of the Class A Preferred  Stock
shall be entitled to receive either cash or securities  based upon the foregoing
in the same proportion as the holders of the Common Stock of the Corporation are
receiving cash or debt securities,  or equity securities in the surviving entity
or another entity.

                           (e)  Notwithstanding  paragraph 4(a), in the event of
any  voluntary  or  involuntary  liquidation,  dissolution  or winding up of the
affairs of the Corporation, the holders of Class A Preferred Stock shall receive
the greater of (i) the amount  payable  under  paragraph  4(a) above or (ii) the
amount which would be the  liquidation  payment per share of Common Stock if the
Class A Preferred Stock were effectively redeemed for Common Stock prior to such
liquidation,  for which purpose the Class A Preferred  Stock shall be treated as
representing an equal number of shares of Common Stock.

                  5.       Redemption.

                           (a)   Optional   Redemption.   Prior  to  the   first
anniversary  of the  date of  issuance  of the  Class  A  Preferred  Stock,  the
Corporation  shall  not  redeem  the Class A  Preferred  Stock.  Subject  to the
preceding   sentence  and  the  requirements  of  paragraph  5(b)  hereof,   the
Corporation may, at its option,  redeem the Class A Preferred Stock for cash, at
any time in whole at the





                                       A-8

<PAGE>



Deemed Value,  together with accrued and unpaid Dividends,  if any, thereon.  If
the  Corporation  has  completed  a Public  Offering  (as  defined  below) or an
Acquisition  more than 35 days prior to the Mandatory  Redemption Date, then the
Corporation  may, at its option,  redeem the Class A Preferred  Stock for Sentry
Common  Stock,  in whole at the Deemed  Value,  together with accrued and unpaid
Dividends,  if  any,  thereon,  subject  to the  following  conditions:  (i) the
redemption  shall be  declared on the  closing  date of such Public  Offering or
Acquisition, (ii) the redemption date shall be fixed no later than 35 days after
such closing  date,  (iii) for purposes of  determining  the Deemed Value in the
case of a Public Offering,  the Closing Price shall equal the price per share at
which  Common  Stock is issued in such Public  Offering and (iv) for purposes of
determining  the Deemed Value in the case of an  Acquisition,  the Closing Price
shall  be  determined  as of the  closing  date  of  such  Acquisition.  "Public
Offering" as used herein shall mean an  underwritten  public  offering of Common
Stock  with  net  proceeds   resulting   therefrom  in  excess  of  $12,000,000.
"Acquisition"  as used herein shall mean an  acquisition  by the  Corporation of
property of or  securities  issued by a third  party in which the  consideration
paid by the Corporation  (i) consists,  in whole or in part, of shares of Common
Stock  and (ii) the  aggregate  value of such  shares of  Common  Stock  exceeds
$12,000,000;  provided that such aggregate  value shall equal the number of such
shares of Common Stock multiplied by the Closing Price as of the closing date of
such Acquisition.

                           (b) Mandatory  Redemption.  On the fourth anniversary
of the  date  of  issuance  of the  Class  A  Preferred  Stock  (the  "Mandatory
Redemption Date"), so long as any shares of the Class A Preferred Stock shall be
outstanding,  the Corporation  shall redeem any issued and  outstanding  Class A
Preferred Stock at the Deemed Value, together with accrued and unpaid Dividends,
if any,  thereon,  for cash (to the  extent  the  Corporation  shall  have funds
legally  available for such payment) or Common Stock,  at Sentry's  option.  The
price of such Common Stock shall be its Closing Price.  To the extent that funds
are not legally  available on the Mandatory  Redemption  Date for the payment in
cash  for the  mandatory  redemption  of the  Class A  Preferred  Stock  and the
Corporation   does  not  issue  Common  Stock  as  payment  for  such  mandatory
redemption, the provisions of paragraph 7 shall apply.

                           (c) Acquired Shares.  Shares of the Class A Preferred
Stock which have been issued and  reacquired  in any  manner,  including  shares
purchased or redeemed,  shall (upon compliance with any applicable provisions of
the laws of the State of Delaware)  have the status of  authorized  and unissued
shares  of  Preferred  Stock  undesignated  as to  class  or  series  and may be
redesignated and reissued as part of any class or series of the Preferred Stock;
provided,  however,  that no such  issued and  reacquired  shares of the Class A
Preferred Stock shall be reissued or sold as Class A Preferred Stock.





                                       A-9

<PAGE>




                  6.       Procedure for Redemption.

                           (a)  Manner of Notice.  In the event the  Corporation
shall redeem shares of the Class A Preferred  Stock,  notice of such  redemption
shall be given by first class  mail,  postage  prepaid,  mailed not less than 30
days nor more  than 60 days  prior to the  redemption  date,  to each  holder of
record of the shares to be redeemed at such holder's address as the same appears
on the stock register of the  Corporation.  Each such notice shall state (i) the
redemption  date;  (ii) the aggregate  number of shares of the Class A Preferred
Stock to be  redeemed;  (iii) the  redemption  payment  and to what  extent such
redemption  payment will be paid in cash and/or Common Stock;  (iv) the place or
places  where  certificates  for  such  shares  are to be  surrendered  for  the
redemption  payment;  and (v) that  Dividends on the shares to be redeemed  will
cease to accrue on such redemption date.

                           (b) Effect of Notice; Redemption.  Notice having been
mailed as aforesaid, from and after the redemption date (unless default shall be
made by the  Corporation in providing money for the payment of the redemption of
the shares so called  for  redemption),  Dividends  on the shares of the Class A
Preferred Stock so called for redemption shall cease to accrue,  and said shares
shall no  longer  be deemed to be  outstanding,  and all  rights of the  holders
thereof as stockholders of the Corporation (except the right to receive from the
Corporation  the redemption  payment) shall cease.  Upon surrender in accordance
with said  notice of the  certificates  for any  shares  so  redeemed  (properly
endorsed or assigned for transfer,  if the Board shall so require and the notice
shall so state),  such shares shall be redeemed by the Corporation at the Deemed
Value plus accrued and unpaid Dividends.

                  7.       Conversion to Notes.

                           (a)  To  the  extent   that  funds  are  not  legally
available  on the  Mandatory  Redemption  Date for the  payment  in cash for the
mandatory  redemption of the Class A Preferred  Stock,  and the Corporation does
not issue Common  Stock as payment for such  mandatory  redemption,  as required
herein,  each outstanding  share of Class A Preferred Stock shall  automatically
convert (the "Conversion")  into a subordinated note (the  "Subordinated  Note")
given  by  the  Corporation  for  the  benefit  of  the  holder  thereof.   Each
Subordinated  Note shall be in a principal amount equal to the Deemed Value plus
accrued and unpaid Dividends.  The Subordinated Notes (i) shall bear interest at
a rate of six percent  (6%) per annum,  (ii) shall mature at the end of one year
from the date of  Conversion,  and (iii)  upon  maturity,  shall  become due and
payable as to any outstanding principal and interest.

                           (b) At the time of the Conversion, the holders of the
Subordinated Notes shall have the right,  voting separately as a class, to elect
one director of the Corporation. Upon the





                                      A-10

<PAGE>



vesting of such right of the  holders of the  Subordinated  Notes,  the  maximum
authorized  number of members of the Board shall  automatically  be increased by
one and the one vacancy so created shall be filled by vote of the holders of the
Subordinated  Notes. The right of the holders of the Subordinated Notes to elect
a member  of the  Board as  aforesaid  shall  continue  until  such  time as the
Subordinated  Notes  have been paid in full,  at which  time  such  right  shall
terminate,  except as herein or by law expressly  provided.  Upon termination of
such special voting rights  attributable  to holders of the  Subordinated  Notes
pursuant to this  paragraph,  the term of office of any director  elected by the
holders  of  Subordinated  Notes  (any  such  director,  a  "Subordinated  Notes
Director")  pursuant to such special voting rights shall  immediately  terminate
and the number of  directors  constituting  the entire Board shall be reduced by
one. Any Subordinated Notes Director may be removed by, and shall not be removed
otherwise than by, a majority vote of the outstanding Subordinated Notes. If the
office of any  Subordinated  Notes  Director  becomes vacant by reason of death,
resignation, retirement, disqualification,  removal from office, or otherwise, a
successor who shall hold office for the unexpired  term in respect of which such
vacancy occurred shall be elected by a majority of the outstanding  Subordinated
Notes, voting separately as a class.

                           (b) The indebtedness  represented by the Subordinated
Notes and the payment of the  principal  of and any  interest on each and all of
the  Subordinated  Notes shall be subordinate and subject in right of payment to
the prior payment in full of all Senior Indebtedness (as defined below). "Senior
Indebtedness"  as used herein shall mean the  principal of and premium,  if any,
and interest on (a) all  indebtedness  of the  Corporation  for money  borrowed,
other  than  Preferred  Stock,  whether  outstanding  as of the date  hereof  or
thereafter created,  incurred or assumed,  except indebtedness that by the terms
of the  instrument  or  instruments  by which such  indebtedness  was created or
incurred  expressly  provides  that it (i) is junior in right of  payment to the
Subordinated  Notes or (ii) ranks pari passu with the  Subordinated  Notes,  (b)
amendments, renewals, extensions, modifications,  refinancings and refundings of
any such  indebtedness  and (c) all of the  Corporation's  trade  payables.  For
purposes of the preceding sentence,  "indebtedness for money borrowed" when used
with respect to the Corporation  means:  (a) all indebtedness of the Corporation
for  money  borrowed   (including  any  indebtedness   secured  by  a  mortgage,
conditional  sales  contract  or other  lien which is (i) given to secure all or
part of the purchase  price of property  subject  thereto,  whether given to the
vendor of such  property or to another or (ii)  existing on property at the time
of acquisition  thereof);  (b) all indebtedness of the Corporation  evidenced by
notes, debentures,  bonds or other securities;  (c) all lease obligations of the
Corporation  which are capitalized on the books of the Corporation in accordance
with generally accepted accounting principles; (d) all indebtedness of others of
the kinds described





                                      A-11

<PAGE>



in the  preceding  clause  (c)  assumed  by or  guaranteed  in any manner by the
Corporation or in effect  guaranteed by the Corporation  through an agreement to
purchase,   contingent  or  otherwise;  and  (e)  all  renewals,  extensions  or
refundings  of  indebtedness  of the  kinds  described  in any of the  preceding
clauses (a), (b) or (d) and all renewals or extensions of lease  obligations  of
the kinds described in either of the preceding clauses (c) or (d).

                  8. Voting Rights. The holders of record of shares of the Class
A Preferred  Stock shall not be entitled to any voting rights except as provided
by law or otherwise specifically provided herein.

                  9.  Consent.  No consent  of holders of the Class A  Preferred
Stock shall be required for (a) the creation of any  indebtedness of any kind of
the  Corporation,  (b) the  creation  of any  class of stock of the  Corporation
ranking  junior as to dividends  and upon  liquidation  to the Class A Preferred
Stock, or (c) any increase or decrease in the amount of authorized Common Stock.

                  10.  Amendments.  The Board  reserves the right by  subsequent
amendment of this Certificate from time to time to decrease the number of shares
which constitute the Class A Preferred Stock (but not below the number of shares
thereof then  outstanding and required for the payment of Dividends  pursuant to
paragraph 2).

         FIFTH. To the full extent permitted by the DGCL or any other applicable
laws presently or hereafter in effect,  no director of the Corporation  shall be
personally  liable to the Corporation or its stockholders for or with respect to
any acts or omissions in the  performance  of his or her duties as a director of
the  Corporation.  Any repeal or  modification  of this Article  FIFTH shall not
adversely  affect  any right or  protection  of a  director  of the  Corporation
existing immediately prior to such repeal or modification.

         SIXTH.  Each person who is or was or had agreed to become a director or
officer of the Corporation, or each such person who is or was serving or who had
agreed to serve at the request of the Board or an officer of the  Corporation as
an employee or agent of the Corporation or as a director,  officer,  employee or
agent of another corporation,  partnership, joint venture, trust or other entity
(including the heirs, executors, administrators or estate of such person), shall
be  indemnified by the  Corporation to the full extent  permitted by the DGCL or
any other applicable laws as presently or hereafter in effect.  Without limiting
the generality or the effect of the foregoing,  the Corporation may adopt bylaws
or  enter  into  one or more  agreements  with  any  person  which  provide  for
indemnification  greater or different  than that provided in this Article or the
DGCL. Any repeal or modification of this Article





                                      A-12

<PAGE>



SIXTH shall not  adversely  affect any right or  protection  existing  hereunder
immediately prior to such repeal or modification.

         SEVENTH.  The number of directors of the Corporation  shall be five (5)
until changed by amendment to this Certificate.

         EIGHTH.  In  furtherance  and not in limitation of the rights,  powers,
privileges,  and  discretionary  authority  granted or  conferred by the DGCL or
other  statutes  or laws of the  State  of  Delaware,  the  Board  is  expressly
authorized  to make,  alter,  amend or repeal  the  bylaws  of the  Corporation,
without any action on the part of the  stockholders,  but the  stockholders  may
make additional bylaws and may alter,  amend or repeal any bylaw whether adopted
by them or otherwise.  The  Corporation may in its bylaws confer powers upon its
Board in addition to the foregoing and in addition to the powers and authorities
expressly conferred upon the Board by applicable law.

         NINTH. The Corporation  reserves the right at any time and from time to
time  to  amend,  alter,  change  or  repeal  any  provision  contained  in this
Certificate and other provisions authorized by the laws of the State of Delaware
at the time in force may be added or  inserted,  in the manner now or  hereafter
prescribed  herein  or by  applicable  law;  and  all  rights,  preferences  and
privileges of whatsoever  nature conferred upon  stockholders,  directors or any
other persons whomsoever by and pursuant to this Certificate in its present form
or as hereafter amended are granted subject to this reservation.







                                      A-13

<PAGE>



                                    EXHIBIT B

                             DIRECTORS AND OFFICERS
                                       OF
                          SENTRY TECHNOLOGY CORPORATION

Sentry directors shall be:

                  Thomas A. Nicolette
                  William A. Perlmuth
                  Andrew L. Benson
                  Robert D. Furst, Jr.
                  Robert L. Barbanell


Sentry's officers shall be:

                  C.E.O. Thomas A. Nicolette
                  V.P. Andrew L. Benson
                  C.F.O. Peter J. Mundy














                                       B-1

<PAGE>



                                    EXHIBIT C

                            FORM OF AFFILIATE LETTER




October   , 1996


Sentry Technology Corporation
[Address]
[Address]

Ladies and Gentlemen:

         I have been  advised that as of the date of this letter I may be deemed
to be an "affiliate" of                                                      , a
                 corporation  (the  "Company"),  as the term  "affiliate" is (i)
defined  for  purposes  of  paragraphs  (c) and (d) of Rule 145 of the rules and
regulations  (the  "Rules  and  Regulations")  of the  Securities  and  Exchange
Commission (the "Commission")  under the Securities Act of 1933, as amended (the
"Securities  Act"),  or (ii)  used in and for  purposes  of  Accounting  Series,
Releases 130 and 135, as amended,  of the  Commission.  Pursuant to the terms of
the Agreement and Plan of Reorganization and Merger dated as of October 10, 1996
(the "Merger  Agreement"),  by and among Video Sentry  Corporation,  a Minnesota
corporation  ("Video"),   Knogo  North  America  Inc.,  a  Delaware  corporation
("Knogo"),  Sentry Technology  Corporation,  a Delaware corporation  ("Sentry"),
Viking  Merger Corp.,  a Minnesota  corporation  and wholly owned  subsidiary of
Sentry  ("Viking"),  and Strip Merger Corp., a Delaware  corporation  and wholly
owned subsidiary of Sentry ("Strip"),  Viking will be merged with and into Video
and Strip will be merged with and into Knogo (the "Merger").

         As a result of the Merger,  I may receive  shares of the common  stock,
par value $0.001 per share, of Sentry (the "Sentry  Securities") in exchange for
shares owned by me of the common stock, par value $0.01 per share, of .

         I  represent,  warrant  and  covenant  to  Sentry  that in the  event I
received any Sentry Securities as a result of the Merger:

         A. I shall  not make any sale,  transfer  or other  disposition  of the
Sentry  Securities  in  violation  of  the  Securities  Act  or  the  Rules  and
Regulations.

         B. I have  carefully  read this  letter and the Merger  Agreement,  and
discussed the  requirements of such documents and other  applicable  limitations
upon my ability to sell, transfer or





                                       C-1

<PAGE>



otherwise dispose of the Sentry Securities to the extent I deemed necessary with
my counsel or counsel for the Company.

         C. I have been  advised that the  issuance of Sentry  Securities  to me
pursuant  to the  Merger  has been  registered  with the  Commission  under  the
Securities Act on a  Registration  Statement on Form S-4.  However,  I have also
been advised that,  since at the time the Merger was submitted for a vote of the
stockholders  of the  Company,  I may be deemed to have been an affiliate of the
Company  and the  distribution  by me of the  Sentry  Securities  has  not  been
registered  under the  Securities  Act, I may not sell,  transfer  or  otherwise
dispose of the  Sentry  Securities  issued to me in the  Merger  unless (i) such
sale,  transfer or other  disposition has been  registered  under the Securities
Act, (ii) such sale,  transfer or other  disposition is made in conformity  with
Rule 145 promulgated by the Commission under the Securities Act, or (iii) in the
opinion of counsel reasonably acceptable to Sentry, or pursuant to a "no action"
letter obtained by the undersigned from the staff of the Commission,  such sale,
transfer or other  disposition is otherwise exempt from  registration  under the
Securities Act.

         D. I  understand  that Sentry is under no  obligation  to register  the
sale,  transfer or other  disposition  of the Sentry  Securities  by me or on my
behalf under the Securities  Act or to take any other action  necessary in order
to make compliance with an exemption from such registration available.

         E. I also understand that stop transfer  instructions  will be given to
Sentry's  transfer  agents with respect to the Sentry  Securities and that there
will be placed on the  certificates for the Sentry  Securities  issued to me, or
any substitutions therefor, a legend stating in substance:

         "THE  SHARES   REPRESENTED  BY  THIS   CERTIFICATE  WERE  ISSUED  IN  A
         TRANSACTION TO WHICH RULE 145  PROMULGATED  UNDER THE SECURITIES ACT OF
         1933 APPLIES.  THE SHARES  REPRESENTED BY THIS  CERTIFICATE MAY ONLY BE
         TRANSFERRED  IN  ACCORDANCE  WITH  THE  TERMS  OF  AN  AGREEMENT  DATED
         __________________,  1996  BETWEEN  THE  REGISTERED  HOLDER  HEREOF AND
         SENTRY TECHNOLOGY CORPORATION,  A COPY OF WHICH AGREEMENT IS ON FILE AT
         THE PRINCIPAL OFFICES OF SENTRY TECHNOLOGY CORPORATION."

         F. I also  understand  that  unless  the  transfer  by me of my  Sentry
Securities  has been  registered  under the  Securities Act or is a sale made in
conformity  with the provisions of Rule 145,  Sentry reserves the right to place
the following legend on the certificates issued to my transferee:

         "THE SHARES  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN REGISTERED
         UNDER THE  SECURITIES  ACT OF 1933 AND WERE  ACQUIRED FROM A PERSON WHO
         RECEIVED  SUCH SHARES IN A  TRANSACTION  TO WHICH RULE 145  PROMULGATED
         UNDER THE SECURITIES ACT OF 1933





                                       C-2

<PAGE>



         APPLIES.  THE SHARES  HAVE BEEN  ACQUIRED BY THE HOLDER NOT WITH A VIEW
         TO, OR FOR RESALE IN CONNECTION WITH, ANY  DISTRIBUTION  THEREOF WITHIN
         THE MEANING OF THE SECURITIES ACT OF 1933 AND MAY NOT BE SOLD,  PLEDGED
         OR OTHERWISE  TRANSFERRED  EXCEPT IN ACCORDANCE  WITH AN EXEMPTION FROM
         THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT OF 1933."

         It is understood  and agreed that the legends set forth in paragraphs E
and F above shall be removed by delivery of substitute certificates without such
legend if such legend is not required for purposes of the Securities Act or this
Agreement.  It is  understood  and agreed that such  legends and the stop orders
referred to above will be removed if (i) two years shall have  elapsed  from the
date the undersigned  acquired the Sentry Securities  received in the Merger and
the  provisions of Rule 145(d)(2) are then  available to the  undersigned,  (ii)
three years shall have elapsed from the date the undersigned acquired the Sentry
Securities  received in the Merger and the provisions of Rule 145(d)(3) are then
available to the undersigned,  or (iii) Sentry has received either an opinion of
counsel,  which opinion and counsel shall be reasonably  satisfactory to Sentry,
or a "no  action"  letter  obtained  by the  undersigned  from the  staff of the
Commission,  to the effect that the  restrictions  imposed by Rule 145 under the
Securities act no longer apply to the undersigned.

         Execution of this letter  should not be  considered  an admission on my
part that I am an "affiliate" of the Company as described in the first paragraph
of this  letter or as a waiver  of any  rights I may have to object to any claim
that I am such an affiliate on or after the date of this letter.

                                                     Very truly yours,



                                      ------------------------------------------
                                      Name:


Accepted this      day of
October, 1996

SENTRY TECHNOLOGY CORPORATION


By:
Name:
Title:








                                       C-3

<PAGE>


                    AMENDMENT NO. 1 TO AMENDED AND RESTATED
                AGREEMENT AND PLAN OF REORGANIZATION AND MERGER

   
          AMENDMENT  NO.  1 TO  AMENDED  AND  RESTATED  AGREEMENT  AND  PLAN  OF
REORGANIZATION AND MERGER (the "Amendment") dated as of January 10, 1997, by and
among VIDEO SENTRY CORPORATION,  a Minnesota corporation ("VIDEO"),  KNOGO NORTH
AMERICA INC., a Delaware corporation ("KNOGO"), SENTRY TECHNOLOGY CORPORATION, a
Delaware corporation  ("SENTRY"),  VIKING MERGER CORP., a Minnesota  corporation
("VMC"), and STRIP MERGER CORP., a Delaware corporation ("SMC").
    

                                    RECITALS

          WHEREAS,  VIDEO, KNOGO,  SENTRY, VMC and SMC have each entered into an
Amended and  Restated  Agreement  and Plan of  Reorganization  and Merger  dated
November 27, 1996 (the "Merger  Agreement")  with respect to the merger of Video
and Knogo; and

         WHEREAS,  VIDEO,  KNOGO,  SENTRY, VMC and SMC wish to modify certain of
the provisions of the Merger Agreement.

         NOW, THEREFORE,  in consideration of the  representations,  warranties,
covenants,  agreements,  and undertakings  contained herein,  the parties hereby
agree as follows:

1. Definition.  Capitalized terms used in this Amendment that are defined in the
Merger Agreement shall have the meanings  attributed to such terms in the Merger
Agreement,  and capitalized terms used in this Amendment that are defined herein
shall have the meanings attributed to such terms herein.

2.  Amendments.  The  provisions  of the Amended  and  Restated  Certificate  of
Incorporation of Sentry at Exhibit A to the Merger Agreement shall be amended as
follows:
     
         a. Article II,  Section A is hereby  amended by deleting the first four
sentences  of  paragraph  2(g),  then adding in their place the  following  four
sentences:

          "Whenever at any time or times,  any Dividend  payable shall
          be, and continue, in arrears, the holders of the outstanding
          shares of Class A  Preferred  Stock  shall  have the  right,
          voting  separately as a class, to elect two directors of the
          Corporation,  no later  than two years  after  the  incurred
          default in the payment of the Dividend.  Upon the vesting of
          such right of the  holders




<PAGE>

          of Class A Preferred Stock, the maximum authorized number of
          members of the Board shall automatically be increased by two
          and the two  vacancies so created shall be filled by vote of
          the holders of the  outstanding  shares of Class A Preferred
          Stock.  The right of the holders of Class A Preferred  Stock
          to elect  members of the Board as aforesaid  shall  continue
          until such time as all  Dividends in arrears shall have been
          paid in full,  at which  time such  right  shall  terminate,
          except as herein or by law  expressly  provided,  subject to
          revesting in the event of each and every subsequent  default
          of the character above  described.  Upon termination of such
          special voting rights attributable to holders of the Class A
          Preferred  Stock  pursuant  to this  paragraph,  the term of
          office of any directors  elected by the holders of shares of
          Class A  Preferred  Stock  (any such  directors,  a "Class A
          Preferred Stock  Director")  pursuant to such special voting
          rights  shall  immediately   terminate  and  the  number  of
          directors  constituting the entire Board shall be reduced by
          two.

          b.  Article  II,  Section A is hereby  amended by adding to the end of
paragraph 9 the following sentence:

          "The  holders  of record of shares of the Class A  Preferred
          Stock  shall have the right,  voting as a class,  to vote on
          (i) any change in the rights,  privileges or  preferences of
          the Class A Preferred Stock,  provided that a favorable vote
          of at least  two-thirds of the number of outstanding  shares
          of the Class A Preferred Stock is required to authorize such
          change,  (ii)  the  creation  of  any  additional  class  of
          preferred  stock  senior  to the  Class A  Preferred  Stock,
          provided that an affirmative  vote of at least two-thirds of
          the  outstanding  shares of the Class A  Preferred  Stock is
          required  for the creation of such senior  class,  and (iii)
          the  creation of any  additional  class of  preferred  stock
          equal in preference to the Class A Preferred Stock, provided
          that an  affirmative  vote of at  least  a  majority  of the
          outstanding  shares  of  the  Class  A  Preferred  Stock  is
          required for the creation of such equal class."

3. Continued  Effectiveness of Merger Agreement.  Except as amended hereby,  the
Merger  Agreement shall continue in full force and effect in accordance with the
terms thereof.

4.   Waivers; Amendments.

          (a) No  failure  or delay on the part of any party in  exercising  any
right, power or privilege hereunder shall operate as a waiver thereof, nor shall
any single or partial  exercise  thereof  preclude any other or further exercise
thereof or the exercise of any other right,  power or privilege.  The rights and
remedies  herein provided shall be cumulative and not exclusive of any rights or
remedies provided by law.

                                       2
<PAGE>

          (b) Any  provision  of this Amendment may be amended or waived if, but
only if,  such  amendment  or waiver is in writing  and is signed by the parties
hereto.

5.  Severability.  Any  provision  of this  Amendment  which  is  prohibited  or
unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective
to the extent of such prohibition or unenforceability  without  invalidating the
remaining   provisions   of  this   Amendment  or  affecting   the  validity  or
unenforceability of such provision in any other jurisdiction.

6. Choice of Law.  This  Amendment  shall be  construed in  accordance  with and
governed by the laws of the State of Delaware.

7. Counterparts;  Effectiveness. This Amendment may be executed in any number of
counterparts  each of which shall be an original  with the same effect as if the
signatures thereto and hereto were upon the same instrument.


                                * * *





                                       3

<PAGE>

          IN  WITNESS  WHEREOF,  this  Amendment  No.  1 has been  executed  and
delivered as of the date first above written.
   
                                        VIDEO SENTRY CORPORATION 

                                        By:  /s/ Robert D. Furst, Jr.
                                            ------------------------------------
                                        Name:   Robert D. Furst, Jr.
                                        Title:  Chairman and CEO


                                        KNOGO NORTH AMERICA INC.

                                        By:  /s/ Thomas A. Nicolette
                                            ------------------------------------
                                        Name:   Thomas A. Nicolette
                                        Title:  President and CEO


                                        SENTRY TECHNOLOGY CORPORATION

                                        By:  /s/ Robert D. Furst, Jr.
                                            ------------------------------------
                                        Name:   Robert D. Furst, Jr.
                                        Title:  President


                                        VIKING MERGER CORP.

                                        By:  /s/ Robert D. Furst, Jr.
                                            ------------------------------------
                                        Name:   Robert D. Furst, Jr.
                                        Title:  President


                                        STRIP MERGER CORP.

                                        By:  /s/ Robert D. Furst, Jr.
                                            ------------------------------------
                                        Name:   Robert D. Furst, Jr.
                                        Title:  President
    
                                       4






<PAGE>

                                                                      APPENDIX B
<PAGE>

                                   ALEX. BROWN
                    AMERICA'S OLDEST INVESTMENT BANKING FIRM
                                ESTABLISHED 1800


                                                                October 10, 1996

Video Sentry Corporation 
6365 Carlson Drive 
Eden Prairie, Minnesota 55346 


Dear Sirs: 

         Video  Sentry  Corporation  ("Video"  or the  "Company"),  Knogo  North
America Inc. ("Knogo"), Sentry Technology Corporation ("Sentry"),  Viking Merger
Corp., a Minnesota  corporation and a wholly-owned  subsidiary of Sentry ("Video
Merger  Corp."),   and  Strip  Merger  Corp.,  a  Delaware   corporation  and  a
wholly-owned  subsidiary of Sentry ("Knogo Merger Corp."),  have entered into an
Agreement  and Plan of  Reorganization  and Merger  dated as of October 10, 1996
(the "Agreement"). Pursuant to the Agreement, Video Merger Corp. shall be merged
with and into Video which shall  continue as the  surviving  corporation  of the
merger (the "Video  Merger"),  and Knogo Merger  Corp.  shall be merged with and
into Knogo which shall continue as the surviving  corporation of the merger (the
"Knogo Merger")  (collectively,  the "Merger"),  and each share of common stock,
par  value  $0.01  per  share,  of  Video  ("Video  Common  Stock")  issued  and
outstanding  immediately prior to the effective time of the Video Merger will be
converted into one share of common stock,  par value $0.001 per share, of Sentry
("Sentry Common Stock") (the "Exchange Ratio"), and each 1.2022 shares of common
stock,  par value $0.01 per share,  of Knogo ("Knogo  Common  Stock") issued and
outstanding  immediately prior to the effective time of the Knogo Merger will be
converted  into one  share  of  Sentry  Common  stock  and one  share of Class A
Preferred Stock, par value $0.001 per share of Sentry ("Sentry Class A Preferred
Stock"). We have assumed,  with your consent,  that the Merger will qualify as a
tax free  transaction  for federal  income tax purposes.  You have requested our
opinion as to whether the  Exchange  Ratio is fair,  from a  financial  point of
view, to Video's stockholders.

         Alex. Brown & Sons Incorporated ("Alex. Brown"), as a customary part of
its investment  banking business,  is engaged in the valuation of businesses and
their  securities  in  connection  with  mergers  and  acquisitions,  negotiated
underwritings, private placements and valuations for estate, corporate and other
purposes.  We have acted as financial advisor to the Board of Directors of Video
in connection  with the  transaction  described above and will receive a fee for
our services, a significant portion of which is contingent upon the consummation
of the Merger and a portion of which  becomes  payable upon the delivery of this
opinion. In the ordinary course of business,  Alex. Brown may actively trade the
securities  of both the Company and Knogo for our own account and the account of
our customers and, accordingly, may at any time hold a long or short position in
securities of the Company and Knogo.  



                         ALEX. BROWN & SONS INCORPORATED
                  ONE SOUTH STREET o BALTIMORE, MARYLAND 21202
                  o TELEPHONE: (410) 727-1700 o TELEX: 198186

<PAGE>

Video Sentry Corporation 
October 10, 1996 
Page 2 

         In connection  with this opinion,  we have  reviewed  certain  publicly
available financial information and other information concerning Video and Knogo
and certain internal analyses and other information furnished to us by Video and
Knogo. We have also held discussions with the members of the senior  managements
of Video and Knogo  regarding the businesses  and prospects of their  respective
companies and the joint prospects of a combined  company.  In addition,  we have
(i) reviewed the reported prices and trading activity for the Video Common Stock
and Knogo  Common  Stock,  (ii)  compared  certain  financial  and stock  market
information  for Video and Knogo with  similar  information  for  certain  other
companies  whose  securities are publicly  traded,  (iii) reviewed the financial
terms of certain  recent  business  combinations  which we deemed  comparable in
whole or in part,  (iv) reviewed the terms of the Agreement and certain  related
documents, and (v) performed such other studies and analyses and considered such
other factors as we deemed appropriate.

         We have not independently  verified the information described above and
for  purposes of this  opinion  have  assumed  the  accuracy,  completeness  and
fairness thereof.  With respect to the information  relating to the prospects of
Video and  Knogo,  we have  assumed  that  such  information  reflects  the best
currently  available  judgments  and estimates of the  managements  of Video and
Knogo as the likely future financial  performances of their respective companies
and of the combined entity. In addition, we have not made nor been provided with
an independent evaluation or appraisal of the assets or liabilities of Video and
Knogo, nor have we been furnished with any such evaluations or appraisals.

         We are not  expressing  our opinion as to the value of Sentry's  common
stock when issued  pursuant to the Merger or the prices at which Sentry's common
stock will trade  subsequent to such  issuance.  Our opinion is based on market,
economic and other  conditions as they exist and can be evaluated as of the date
of this  letter.  Our opinion  expressed  herein was prepared for the use of the
Board of Directors  of Video and does not  constitute  a  recommendation  to any
stockholders as to how such stockholder should vote.

         Based upon and subject to the foregoing,  it is our opinion that, as of
the date of this letter,  the Exchange Ratio is fair,  from a financial point of
view, to Video's stockholders.

                                         Very truly yours, 


                                         ALEX. BROWN & SONS INCORPORATED 


                                         By: /s/ Alex. Brown & Sons Incorporated
                                             -----------------------------------
                                             
<PAGE>
   
                                   ALEX. BROWN
                    AMERICA'S OLDEST INVESTMENT BANKING FIRM
                                ESTABLISHED 1800


                                                              January 21, 1997 


Video Sentry Corporation 
6365 Carlson Drive 
Eden Prairie, Minnesota 55346 


Dear Sirs: 

   This letter will serve to confirm that nothing has come to our attention 
as of the date hereof which would cause us to change the form or content of 
our opinion in the aforementioned letter. The nature and scope of our 
investigation, subsequent to October 10, has been more limited than that 
conducted in support of the October 10 opinion. 


                                        Very truly yours, 


                                        ALEX. BROWN & SONS INCORPORATED 


                                        By: /s/ Alex. Brown & Sons Incorporated
                                            ------------------------------------



                         ALEX. BROWN & SONS INCORPORATED
                  ONE SOUTH STREET o BALTIMORE, MARYLAND 21202
                  o TELEPHONE: (410) 727-1700 o TELEX: 198186

    

<PAGE>

                                                                      APPENDIX C
<PAGE>


                          DONALD & CO. SECURITIES INC.

                              PARK AVENUE TOWER
                  65 EAST 55TH STREET, NEW YORK, N.Y. 10022

                                                                October 10, 1996
Board of Directors
Knogo North America Inc.
350 Wireless Boulevard
Hauppauge, New York 11788

Members of the Board:

   You have requested our opinion as investment bankers as to the fairness, from
a financial  point of view,  to the  stockholders  of Knogo North  America  Inc.
("Knogo" or the "Company") in connection  with the proposed  reorganization  and
merger (the "Merger")  pursuant to an Agreement and Plan of  Reorganization  and
Merger (the  "Merger  Agreement")  among the Company,  Video Sentry  Corporation
("VSC"),   Sentry  Technology   Corporation   ("Sentry")  and  two  wholly-owned
subsidiaries  of Sentry,  Strip  Merger  Corp.  ("SMC") and Viking  Merger Corp.
("VMC").  Pursuant to the Merger Agreement, the issued and outstanding shares of
common stock of the Company are to be  exchanged at a rate of 1.2022  shares for
(i) one share of Sentry  common stock,  $.001 par value per share,  and (ii) one
share of Sentry  Class A  preferred  stock,  $.001  par  value  per  share  (the
"Exchange  Rate"). We understand that the Merger is intended to qualify as a tax
free reorganization for federal income tax purposes.

   In  connection  with  rendering  our opinion,  we have reviewed and analyzed,
among other things,  the  following  (i) a draft,  dated October 9, 1996, of the
Merger Agreement;  (ii) certain publicly  available  information  concerning the
Company,  including its annual  report on Form 10-K for the year ended  December
31, 1995 and its quarterly reports on Form 10-Q for the quarters ended March 31,
1996 and June 30, 1996; (iii) certain publicly available information  concerning
VSC,  including its annual  report on Form 10-K for the year ended  December 31,
1995 and its  quarterly  reports on Form 10-Q for the  quarters  ended March 31,
1996 and June 30, 1996; (iv) certain financial forecasts concerning the business
and  organization of the Company,  VSC and the post-Merger  entity;  (v) certain
publicly  available  information with respect to certain other companies that we
believe to be comparable in certain respects to the Company, VSC and the trading
markets  for  such  other  companies'  securities;   (vi)  certain  nontechnical
information  concerning U.S. patent no.  5,241,380  issued to VSC; (vii) certain
publicly available information concerning the nature and terms and certain other
transactions that we consider relevant to our inquiry; and (viii) the Term Sheet
respecting  the  Merger.  We have  discussed  the  foregoing  items and  issues,
including business operations,  financial conditions and prospects of Knogo, VSC
and  the post-Merger entity,  with certain officers and employees of the Company
and VSC, as well as other  matters we believe  relevant to our inquiry.  We have
conducted  such other  studies,  analysis,  inquiries  and  investigations,  and
considered such other matters, as we deemed relevant and appropriate.

   In our review and in rendering  our opinion,  we have assumed and relied upon
the  accuracy and  completeness  of all  information  provided to us or publicly
available.  We have neither independently verified or assumed responsibility for
verifying  any  of  such  information.   We  have  assumed  that  the  financial
projections we have received have been reasonably prepared on a basis reflecting
the best

[SIPC LOGO]

    Members SIPC, NASD o (212) 872-2000 o 1 (800) 962-WILL o FAX: (212) 832-6384

                                       C-1


<PAGE>

currently available estimates and judgments of management as to future financial
performance.  We have not made,  obtained,  or assumed  any  responsibility  for
making or obtaining, any  independent  evaluations  or  appraisals of any of the
assets or liabilities of the Company, VSC or the post-Merger entity.

   Our opinion is  necessarily  based on financial,  economic,  market and other
conditions as they exist on, and information made available to us as of the date
hereof.  It should be understood  that,  although  subsequent  developments  may
affect this opinion, we do not have any obligation to update, revise or reaffirm
this opinion. Furthermore, our opinion does not address the Company's underlying
business  decision to effect the Merger,  and should not be read as implying any
conclusion  as to the price or  trading  range of the  stock of the  post-Merger
entity.  Our opinion is based on the assumption that the Agreement to be entered
into will conform in all material respects to the draft dated October 9, 1996.

   
   The  opinion  expressed  herein  was  prepared  for the use of the  Board  of
Directors and does not constitute a recommendation  to any stockholder as to how
such stockholder  should vote. This letter and our opinion  expressed herein are
not be quoted, summarized or referred to, in whole or in part, without our prior
written consent.
    

   Based upon and subject to the  foregoing,  it is our  opinion  that as of the
date hereof,  the Exchange Rate is fair,  from a financial point of view, to the
stockholders of Knogo.

                                               Very truly yours,
                                               DONALD & CO. SECURITIES INC.


                                               By: /s/ STEPHEN A. BLUM
                                                   -----------------------------
                                                   Stephen A. Blum, President

                                       C-2


<PAGE>

   
                          DONALD & CO. SECURITIES INC.
                               Park Avenue Tower
                    65 East 55th Street, New York, N.Y 10022



                                January 21, 1997


Board of Directors
Knogo North America, Inc.
350 Wireless Boulevard
Hauppauge, NY 11788

Members of the Board:

   You have  requested  us to update  our  letter to you of  October  10,  1996.
Defined terms therein shall have the same meaning herein.

   In connection  with our update,  we have reviewed (i) the  preliminary  joint
proxy  statements  of the Company and VCS submitted to the  Securities  Exchange
Commission  on January 7, 1997 (ii) the executed  Agreement,  together  with any
amendments  thereto  and/or  restatements  thereof that were  included  with the
filing referred to in clause (i) hereof,  and (iii) the Quarterly Report on Form
10-Q of the  Company  for the quarter  ended  September  30, 1996 filed with the
Securities  &  Exchange   Commission.   We  have  also  had  conversations  with
representatives of the Company to, among other things, confirm that there are no
matters which may have caused the Company to change its  forecasts  with respect
to the merged  entity.  We have  specifically  considered  the decline in market
price of the publicly traded securities of the Company and VSC.

   Except as set  forth in this  letter,  we have not  taken any other  steps or
analysis with respect to this update.

   This letter will serve to confirm that  nothing has come to our  attention as
of the date  hereof  which  would  cause us to change the form or content of our
opinion contained in the aforesaid letter.

   The  assumptions,  limitations  and  conditions set forth in the letter shall
continue to apply.


                                        Very truly yours,


                                        DONALD & CO. SECURITIES INC.

                                              /s/ Stephen A. Blum
                                        ------------------------------
                                        By: Stephen A. Blum, President


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     Members SIPC, NASD . (212) 872-2000 . 1(800) 962-WILL . FAX: (212) 832-6554
    
                                       C-3



<PAGE>

                                                                      APPENDIX D
<PAGE>

                       MINNESOTA Business Corporation Act


         302A.473   PROCEDURES FOR ASSERTING DISSENTERS' RIGHTS.--

         Subdivision 1. Definitions. (a) For purposes of this section, the terms
defined in this subdivision have the meanings given them.

         (b) "Corporation" means the issuer of the shares held by a dissenter
before the corporate action referred to in section 302A.471, subdivision 1 or
the successor by merger of that issuer.

         (c) "Fair value of the shares" means the value of the shares of
corporation immediately before the effective date of the corporate action
referred to in section 302A.471, subdivision 1.

         (d) "Interest" means interest commencing five days after the effective
date of the corporate action referred to in section 302A.471, subdivision 1 up
to and including the date of payment, calculated at the rate provided in section
549.09 for interest on verdicts and judgments.

         Subd. 2. Notice of action. If a corporation calls a shareholder meeting
at which any action described in section 302A.471, subdivision 1 is to be voted
upon, the notice of the meeting shall inform each shareholder of the right to
dissent and shall include a copy of section 302A.471 and this section and a
brief description of the procedure to be followed under these sections.

         Subd. 3. Notice of dissent. If a proposed action must be approved by
the shareholders, a shareholder who wishes to exercise dissenters' rights must
file with the corporation before the vote on the proposed action a written
notice of intent to demand the fair value of the shares owned by the shareholder
and must not vote the shares in favor of the proposed action.

         Subd. 4. Notice of procedure; deposit of shares. (a) After the proposed
action has been approved by the board and, if necessary, the shareholders, the
corporation shall send to all shareholders who have complied with subdivision 3
and to all shareholders entitled to dissent if no shareholder vote was required,
a notice that contains:

         (1) The address to which a demand for payment and certificates of
certificated shares must be sent in order to obtain payment and the date by
which they must be received;

         (2) Any restrictions on transfer or uncertificated shares that will
apply after the demand for payment is received;

         (3) A form to be used to certify the date on which the shareholder, or
the beneficial owner on whose behalf the shareholder dissents, acquired the
shares or an interest in them and to demand payment; and

         (4) A copy of section 302A.471 and this section and a brief description
of the procedures to be followed under these sections.





                                        1

<PAGE>


                       MINNESOTA Business Corporation Act

         (b) In order to receive the fair value of the shares, a dissenting
shareholder must demand payment and deposit certificated shares or comply with
any restrictions on transfer of uncertificated shares within 30 days after the
notice was given, but the dissenter retains all other rights of a shareholder
until the proposed action takes effect.

         Subd. 5. Payment; return of shares. (a) After the corporate action
takes effect, or after the corporation receives a valid demand for payment,
whichever is later, the corporation shall remit to each dissenting shareholder
who has complied with subdivisions 3 and 4 the amount the corporation estimates
to be the fair value of the shares, plus interest, accompanied by:

         (1) the corporation's closing balance sheet and statement of income for
a fiscal year ending not more than 16 months before the effective date of the
corporate action, together with the latest available interim financial
statements;

         (2) an estimate by the corporation of the fair value of the shares and
a brief description of the method used to reach the estimate; and

         (3) a copy of section 302A.471 and this section, and a brief
description of the procedure to be followed in demanding supplemental payment.

         (b) The corporation may withhold the remittance described in paragraph
(a) from a person who was not a shareholder on the date the action dissented
from was first announced to the public or who is dissenting on behalf of a
person who was not a beneficial owner on that date. If the dissenter has
complied with subdivisions 3 and 4, the corporation shall forward to the
dissenter the materials described in paragraph (a), a statement of the reason
for withholding the remittance, and an offer to pay to the dissenter the amount
listed in the materials if the dissenter agrees to accept that amount in full
satisfaction.

         The dissenter may decline the offer and demand payment under
subdivision 6. Failure to do so entitles the dissenter only to the amount
offered. If the dissenter makes demand, subdivisions 7 and 8 apply.

         (c) If the corporation fails to remit payment within 60 days of the
deposit of certificates or the imposition of transfer restrictions on
uncertificated shares, it shall return all deposited certificates and cancel all
transfer restrictions. However, the corporation may again give notice under
subdivision 4 and require deposit or restrict transfer at a later time.

         Subd.6. Supplemental payment; demand. If a dissenter believes that the
amount remitted under subdivision 5 is less than the fair value of the shares
plus interest, the dissenter may give written notice to the corporation of the
dissenter's own estimate of the fair value of the shares, plus interest, within
30 days after the corporation mails the remittance under subdivision 5, and
demand payment of the difference. Otherwise,





                                        2

<PAGE>


                       MINNESOTA Business Corporation Act

a dissenter is entitled only to the amount remitted by the corporation.

         Subd. 7. Petition; determination. If the corporation receives a demand
under subdivision 6, it shall, within 60 days after receiving the demand, either
pay to the dissenter the amount demanded or agreed to by the dissenter after
discussion with the corporation or file in court a petition requesting that the
court determine the fair value of the shares, plus interest. The petition shall
be filed in the county in which the registered office of the corporation is
located, except that a surviving foreign corporation that receives a demand
relating to the shares of a constituent domestic corporation shall file the
petition in the county in this state in which the last registered office of the
constituent corporation was located. The petition shall name as parties all
dissenters who have demanded payment under subdivision 6 and who have not
reached agreement with the corporation. The corporation shall, after filing the
petition, serve all parties with a summons and copy of the petition under the
rules of civil procedure. Non residents of this state may be served by
registered or certified mail or by publication as provided by law. Except as
otherwise provided, the rules of civil procedure apply to this proceeding. The
jurisdiction of the court is plenary and exclusive. The court may appoint
appraisers, with powers and authorities the court deems proper, to receive
evidence on and recommend the amount of the fair value of the shares. The court
shall determine whether the shareholder or shareholders in question have fully
complied with the requirements of this section, and shall determine the fair
value of the shares, taking into account any and all factors the court finds
relevant, computed by any method or combination of methods that the court, in
its discretion, sees fit to use, whether or not used by the corporation or by a
dissenter. The fair value of the shares as determined by the court is binding on
all shareholders, wherever located. A dissenter is entitled to judgment in cash
for the amount by which the fair value of the shares as determined by the court,
plus interest, exceeds the amount, if any, remitted under subdivision 5, but
shall not be liable to the corporation for the amount, if any, by which the
amount, if any, remitted to the dissenter under subdivision 5 exceeds the fair
value of the shares as determined by the court, plus interest.

         Subd. 8. Costs; fees; expenses. (a) The court shall determine the costs
and expenses of a proceeding under subdivision 7, including the reasonable
expenses and compensation of any appraisers appointed by the court, and shall
assess those costs and expenses against the corporation, except that the court
may assess part or all of those costs and expenses against a dissenter whose
action in demanding payment under subdivision 6 is found to be arbitrary,
vexatious, or not in good faith.





                                        3

<PAGE>


                       MINNESOTA Business Corporation Act

         (b) If the court finds that the corporation has failed to comply
substantially with this section, the court may assess all fees and expenses of
any experts or attorneys as the court deems equitable. These fees and expenses
may also be assessed against a person who has acted arbitrarily, vexatiously, or
not in good faith in bringing the proceeding, and may be awarded to a party
injured by those actions.

         (c) The court may award, in its discretion, fees and expenses to an
attorney for the dissenters out of the amount awarded to the dissenters, if any.
(Last amended by Ch. 17, L. '93, eff. 8-1-93.)






                                        4


<PAGE>

                                                                      APPENDIX E

<PAGE>
               GENERAL CORPORATION LAW OF THE STATE OF DELAWARE


   262 APPRAISAL RIGHTS.  (a) Any stockholder of a corporation of this State who
holds  shares  of stock  on the  date of the  making  of a  demand  pursuant  to
subsection  (d) of this section with  respect to such shares,  who  continuously
holds such shares through the effective date of the merger or consolidation, who
has otherwise  complied with  subsection (d) of this section and who has neither
voted in favor of the merger or consolidation  nor consented  thereto in writing
pursuant to Section 228 of this title shall be entitled to an  appraisal  by the
Court  of  Chancery  of the  fair  value  of  his  shares  of  stock  under  the
circumstances  described in subsections (b) and (c) of this section.  As used in
this  section,  the word  "stockholder"  means a holder  of record of stock in a
stock  corporation  and also a member of record of a nonstock  corporation;  the
words  "stock" and "share"  mean and include what is  ordinarily  meant by those
words and also  membership  or  membership  interest  of a member of a  nonstock
corporation;  and  the  words  "depository  receipt"  mean a  receipt  or  other
instrument  issued  by a  depository  representing  an  interest  in one or more
shares, or fractions thereof,  solely of stock of a corporation,  which stock is
deposited with the depository.



   (b) Appraisal rights shall be available for the shares of any class or series
of  stock  of a  constituent  corporation  in a merger  or  consolidation  to be
effected  pursuant  to Section  251 (other  than a merger  effected  pursuant to
subsection (g) of Section 251), 252, 254, 257, 258, 263 or 264 of this title:

         (1)  Provided,  however,  that no  appraisal  rights under this section
    shall be  available  for the  shares of any class or series of stock,  which
    stock, or depository  receipts in respect thereof,  at the record date fixed
    to determine the  stockholders  entitled to receive notice of and to vote at
    the  meeting  of  stockholders  to act  upon  the  agreement  of  merger  or
    consolidation,  were either (i) listed on a national  securities exchange or
    designated as a national market system security on an interdealer  quotation
    system by the National Association of Securities Dealers,  Inc. or (ii) held
    of record by more than 2,000 holders; and further provided that no appraisal
    rights  shall be  available  for any  shares  of  stock  of the  constituent
    corporation  surviving  a  merger  if the  merger  did not  require  for its
    approval the vote of the holders of the surviving corporation as provided in
    subsection (f) of 251 of this title.

         (2) Notwithstanding paragraph (1) of this subsection,  appraisal rights
    under this section  shall be available for the shares of any class or series
    of stock of a constituent corporation if the holders thereof are required by
    the terms of an  agreement of merger or  consolidation  pursuant to Sections
    251,  252, 254, 257, 268, 263 and 264 of this title to accept for such stock
    anything except:


             a. Shares of stock of the  corporation  surviving or resulting from
        such merger or consolidation, or depository receipts in respect thereof;


             b. Shares of stock of any other corporation, or depository receipts
        in respect thereof,  which shares of stock or depository receipts at the
        effective date of the merger or consolidation will be either listed on a
        national  securities  exchange or designated as a national market system
        security on an interdealer  quotation system by the National Association
        of  Securities  Dealers,  Inc.  or held of  record  by more  than  2,000
        holders;


             c.  Cash in lieu of  fractional  shares  or  fractional  depository
        receipts  described  in the  foregoing  subparagraphs  a. and b. of this
        paragraph; or


             d. Any combination of the shares of stock,  depository receipts and
        cash in lieu of  fractional  shares or  fractional  depository  receipts
        described  in  the  foregoing  subparagraphs  a.,  b.  and  c.  of  this
        paragraph.


         (3) In the event all of the stock of a subsidiary Delaware  corporation
    party to a merger  effected  under Section 253 of this title is not owned by
    the parent  corporation  immediately  prior to the merger,  appraisal rights
    shall be available for the shares of the subsidiary Delaware corporation.


             (c) Any corporation may provide in its certificate of incorporation
        that  appraisal  rights  under this section  shall be available  for the
        shares of any  class or series of its stock as a result of an  amendment
        to its  certificate of  incorporation,  any merger or  consolidation  in
        which the corporation is a constituent corporation or the sale of all or
        substantially all of the assets of the


                                       E-1
<PAGE>
        corporation.  If  the  certificate  of  incorporation  contains  such  a
        provision, the procedures of this section,  including those set forth in
        subsections  (d) and (e) of this  section,  shall  apply as nearly as is
        practicable.

             (d) Appraisal rights shall be perfected as follows:

                  (1) If a proposed merger or consolidation  for which appraisal
             rights are  provided  under this  section  is to be  submitted  for
             approval at a meeting of stockholders,  the  corporation,  not less
             than  20  days  prior  to the  meeting,  shall  notify  each of its
             stockholders  who was such on the record date for such meeting with
             respect to shares for which appraisal rights are available pursuant
             to  subsections  (b)  or  (c)  hereof  that  appraisal  rights  are
             available  for  any  or  all  of  the  shares  of  the  constituent
             corporations,  and  shall  include  in such  notice  a copy of this
             section.  Each stockholder  electing to demand the appraisal of his
             shares shall deliver to the  corporation,  before the taking of the
             vote on the merger or consolidation, a written demand for appraisal
             of his  shares.  Such demand will be  sufficient  if it  reasonably
             informs the corporation of the identity of the stockholder and that
             the  stockholder  intends  thereby to demand the  appraisal  of his
             shares. A proxy or vote against the merger or  consolidation  shall
             not constitute such a demand.  A stockholder  electing to take such
             action must do so by a separate  written demand as herein provided.
             Within  10  days  after  the  effective  date  of  such  merger  or
             consolidation,  the surviving or resulting corporation shall notify
             each stockholder of each  constituent  corporation who has complied
             with this  subsection and has not voted in favor of or consented to
             the  merger  or  consolidation  of the  date  that  the  merger  or
             consolidation has become effective; or


                  (2) If the merger or  consolidation  was approved  pursuant to
             Section  228  or  Section  253  of  this  title,  each  constituent
             corporation,  either  before  the  effective  date of the merger or
             consolidation or within ten days  thereafter,  shall notify each of
             the  holders  of any class or  series of stock of such  constituent
             corporation who are entitled to appraisal rights of the approval of
             the merger or consolidation and that appraisal rights are available
             for any or all  shares  of such  class or  series  of stock of such
             constituent corporation, and shall include in such notice a copy of
             this section; provided that, if the notice is given on or after the
             effective date of the merger or consolidation, such notice shall be
             given by the surviving or resulting corporation to all such holders
             of any class or series of stock of a constituent  corporation  that
             are entitled to appraisal rights. Such notice may, and, if given on
             or after the effective date of the merger or consolidation,  shall,
             also notify such  stockholders  of the effective date of the merger
             or consolidation. Any stockholder entitled to appraisal rights may,
             within twenty days after the date of mailing of such notice, demand
             in  writing  from  the  surviving  or  resulting   corporation  the
             appraisal of such holder's  shares.  Such demand will be sufficient
             if it  reasonably  informs the  corporation  of the identity of the
             stockholder and that the stockholder  intends thereby to demand the
             appraisal of such  holder's  shares.  If such notice did not notify
             stockholders of the effective date of the merger or  consolidation,
             either (i) each such  constituent  corporation  shall send a second
             notice  before the  effective  date of the merger or  consolidation
             notifying  each of the  holders  of any class or series of stock of
             such constituent  corporation that are entitled to appraisal rights
             of the effective  date of the merger or  consolidation  or (ii) the
             surviving or resulting  corporation shall send such a second notice
             to all such holders on or within 10 days after such effective date;
             provided,  however, that if such second notice is sent more than 20
             days following the sending of the first notice,  such second notice
             need only be sent to each  stockholder who is entitled to appraisal
             rights and who has demanded  appraisal of such  holder's  shares in
             accordance with this  subsection.  An affidavit of the secretary or
             assistant  secretary  or of the transfer  agent of the  corporation
             that is required  to give  either  notice that such notice has been
             given shall,  in the absence of fraud,  be prima facie  evidence of
             the  facts  stated   therein.   For  purposes  of  determining  the
             stockholders  entitled to receive either notice,  each  constituent
             corporation  may fix, in  advance,  a record date that shall be not
             more than 10 days prior to the date the  notice is given;  provided
             that, if the notice is given on or after the effective date of the

                                       E-2

<PAGE>



             merger or  consolidation,  the record date shall be such  effective
             date.  If no record  date is fixed and the notice is given prior to
             the effective  date, the record date shall be the close of business
             on the day next preceding the day on which the notice is given.

             (e)  Within  120 days  after the  effective  date of the  merger or
        consolidation, the surviving or resulting corporation or any stockholder
        who  has  complied  with  subsections  (a)  and  (d)  hereof  and who is
        otherwise entitled to appraisal rights, may file a petition in the Court
        of Chancery  demanding a determination  of the value of the stock of all
        such stockholders.  Notwithstanding the foregoing, at any time within 60
        days  after  the  effective  date of the  merger or  consolidation,  any
        stockholder  shall have the right to withdraw  his demand for  appraisal
        and to accept the terms offered upon the merger or consolidation. Within
        120 days after the effective  date of the merger or  consolidation,  any
        stockholder  who has complied with the  requirements  of subsections (a)
        and (d) hereof, upon written request,  shall be entitled to receive from
        the corporation surviving the merger or resulting from the consolidation
        a statement  setting forth the  aggregate  number of shares not voted in
        favor of the merger or  consolidation  and with respect to which demands
        for appraisal have been received and the aggregate  number of holders of
        such shares.  Such written  statement shall be mailed to the stockholder
        within 10 days after written request for such a statement is received by
        the  surviving  or  resulting   corporation  or  within  10  days  after
        expiration  of the period for  delivery of demands for  appraisal  under
        subsection (d) hereof, whichever is later.

             (f) Upon the filing of any such petition by a stockholder,  service
        of a copy  thereof  shall  be  made  upon  the  surviving  or  resulting
        corporation,  which shall  within 20 days after such service file in the
        office of the  Register in Chancery  in which the  petition  was filed a
        duly   verified  list   containing   the  names  and  addresses  of  all
        stockholders  who have  demanded  payment for their shares and with whom
        agreements  as to the value of their shares have not been reached by the
        surviving or resulting  corporation.  If the petition  shall be filed by
        the  surviving  or  resulting   corporation,   the  petition   shall  be
        accompanied by such a duly verified  list. The Register in Chancery,  if
        so ordered by the Court,  shall give  notice of the time and place fixed
        for the hearing of such petition by registered or certified  mail to the
        surviving or resulting  corporation and to the stockholders shown on the
        list at the addresses therein stated. Such notice shall also be given by
        1 or more publications at least 1 week before the day of the hearing, in
        a newspaper of general circulation  published in the City of Wilmington,
        Delaware or such publication as the Court deems advisable.  The forms of
        the notices by mail and by  publication  shall be approved by the Court,
        and the  costs  thereof  shall be borne by the  surviving  or  resulting
        corporation.

             (g) At the hearing on such petition,  the Court shall determine the
        stockholders  who have  complied  with this  section and who have become
        entitled to appraisal rights. The Court may require the stockholders who
        have  demanded  an  appraisal  for  their  shares  and  who  hold  stock
        represented by certificates to submit their certificates of stock to the
        Register  in  Chancery  for  notation  thereon  of the  pendency  of the
        appraisal proceedings;  and if any stockholder fails to comply with such
        direction, the Court may dismiss the proceedings as to such stockholder.

             (h) After  determining the  stockholders  entitled to an appraisal,
        the Court  shall  appraise  the  shares,  determining  their  fair value
        exclusive  of any element of value  arising from the  accomplishment  or
        expectation of the merger or consolidation, together with a fair rate of
        interest,  if any, to be paid upon the amount  determined to be the fair
        value. In determining such fair value, the Court shall take into account
        all relevant  factors.  In  determining  the fair rate of interest,  the
        Court may consider all relevant factors,  including the rate of interest
        which the  surviving or resulting  corporation  would have had to pay to
        borrow money during the pendency of the proceeding.  Upon application by
        the surviving or resulting corporation or by any stockholder entitled to
        participate  in  the  appraisal  proceeding,   the  Court  may,  in  its
        discretion,  permit  discovery  or other  pretrial  proceedings  and may
        proceed to trial upon the appraisal prior to the final  determination of
        the stockholder  entitled to an appraisal.  Any  stockholder  whose name
        appears  on the list filed by the  surviving  or  resulting  corporation
        pursuant to subsection (f) of

                                       E-3


<PAGE>


        this  section and who has  submitted  his  certificates  of stock to the
        Register in Chancery, if such is required,  may participate fully in all
        proceedings  until it is finally  determined  that he is not entitled to
        appraisal rights under this Section.

             (i) The Court  shall  direct  the  payment of the fair value of the
        shares,  together with  interest,  if any, by the surviving or resulting
        corporation to the stockholders entitled thereto. Interest may be simple
        or compound,  as the Court may direct.  Payment shall be so made to each
        such  stockholder,  in the  case  of  holders  of  uncertificated  stock
        forthwith, and the case of holders of shares represented by certificates
        upon the surrender to the corporation of the  certificates  representing
        such stock.  The Court's  decree may be enforced as other decrees in the
        Court of Chancery may be enforced,  whether such  surviving or resulting
        corporation be a corporation of this State or of any state.

             (j) The costs of the  proceeding may be determined by the Court and
        taxed  upon  the   parties  as  the  Court   deems   equitable   in  the
        circumstances.  Upon  application of a stockholder,  the Court may order
        all or a  portion  of  the  expenses  incurred  by  any  stockholder  in
        connection with the appraisal proceeding, including, without limitation,
        reasonable  attorney's fees and the fees and expenses of experts,  to be
        charged  pro rata  against  the value of all the shares  entitled  to an
        appraisal.

             (k)  From  and  after  the   effective   date  of  the   merger  or
        consolidation,  no stockholder who has demanded his appraisal  rights as
        provided in  subsection  (d) of this  section  shall be entitled to vote
        such stock for any purpose or to receive  payment of  dividends or other
        distributions  on the stock  (except  dividends  or other  distributions
        payable  to  stockholders  of  record  at a date  which  is prior to the
        effective date of the merger or consolidation);  provided, however, that
        if no petition for an appraisal  shall be filed within the time provided
        in subsection (e) of this section,  or if such stockholder shall deliver
        to the surviving or resulting  corporation  a written  withdrawal of his
        demand  for  an   appraisal   and  an   acceptance   of  the  merger  or
        consolidation,  either  within 60 days after the  effective  date of the
        merger or consolidation as provided in subsection (e) of this section or
        thereafter with the written approval of the corporation,  then the right
        of such  stockholder to an appraisal  shall cease.  Notwithstanding  the
        foregoing,  no appraisal  proceeding  in the Court of Chancery  shall be
        dismissed as to any stockholder  without the approval of the Court,  and
        such  approval  may be  conditioned  upon such terms as the Court  deems
        just.

             (l) The shares of the surviving or resulting  corporation  to which
        the shares of such objecting  stockholders would have been converted had
        they  assented to the merger or  consolidation  shall have the status of
        authorized   and   unissued   shares  of  the   surviving  or  resulting
        corporation. (Last amended by Ch. 349, L. '96, eff. 7-1-96.)

                                      E-4

<PAGE>

                                                                      APPENDIX F

<PAGE>



                            CERTIFICATE OF AMENDMENT

                                 AND RESTATEMENT

                                       OF

                          CERTIFICATE OF INCORPORATION

                                       OF

                          SENTRY TECHNOLOGY CORPORATION

                       (Under Sections 242 and 245 of the
                        Delaware General Corporation Law)


            It is hereby certified that:

         1. The name of the corporation  (hereinafter  called the "Corporation")
is SENTRY TECHNOLOGY CORPORATION.

         2. The  Certificate  of  Incorporation  of the  Corporation  is  hereby
amended and restated in its entirety to read as follows:



                              AMENDED AND RESTATED

                          CERTIFICATE OF INCORPORATION

                                       OF

                          SENTRY TECHNOLOGY CORPORATION

                            (A Delaware corporation)

         FIRST.  The name of the  corporation is SENTRY  TECHNOLOGY  CORPORATION
(the "Company").

         SECOND. The address of the Company's  registered office in the State of
Delaware is 1013 Centre Road, City of Wilmington, County of New Castle, Delaware
19805. The name of the Company's registered agent at such address is Corporation
Service Company.

         THIRD.  The  purpose  of the  Company is to engage in any lawful act or
activity for


                                       1
<PAGE>

which  corporations  may be organized  under the General  Corporation Law of the
State of Delaware.

         FOURTH.  Section 1. Authorized Capital Stock. The Company is authorized
to issue two classes of capital  stock,  designated  Common Stock and  Preferred
Stock.  The total  number  of  shares  of  capital  stock  that the  Company  is
authorized to issue is  50,000,000  shares,  consisting of 40,000,000  shares of
Common Stock,  par value $0.001 per share,  and  10,000,000  shares of Preferred
Stock, par value $0.001 per share.

         Section 2. Preferred Stock. The Preferred Stock may be issued in one or
more  series.  The Board of  Directors  of the Company  (the  "Board") is hereby
authorized to issue the shares of Preferred Stock in such series and to fix from
time to time  before  issuance  the number of shares to be  included in any such
series  and the  designation,  relative  powers,  preferences,  and  rights  and
qualifications,  limitations,  or restrictions of all shares of such series. The
authority  of the Board with respect to each such series will  include,  without
limiting the generality of the foregoing, the determination of any or all of the
following:

                  (a) the number of shares of any series and the  designation to
         distinguish  the  shares of such  series  from the  shares of all other
         series;

                  (b) the voting powers,  if any, and whether such voting powers
         are full or limited in such series;

                  (c) the  redemption  provisions,  if any,  applicable  to such
         series, including the redemption price or prices to be paid;

                  (d)  whether   dividends,   if  any,  will  be  cumulative  or
         noncumulative,  the  dividend  rate of such  series,  and the dates and
         preferences of dividends on such series;

                  (e)  the  rights  of  such  series  upon  the   voluntary   or
         involuntary  dissolution of, or upon any distribution of the assets of,
         the Company;

                  (f) the  provisions,  if any,  pursuant to which the shares of
         such series are convertible  into, or  exchangeable  for, shares of any
         other class or classes or of any other  series of the same or any other
         class or classes of stock, or any other security, of the Company or any
         other corporation or other entity, and the price or prices or the rates
         of exchange applicable thereto;

                  (g) the right,  if any, to  subscribe  for or to purchase  any
         securities of the Company or any other corporation or other entity;

                  (h) the  provisions,  if any, of a sinking fund  applicable to
         such series; and

                                       2
<PAGE>

                  (i) any  other  relative,  participating,  optional,  or other
         special powers, preferences,  rights,  qualifications,  limitations, or
         restrictions thereof;

all as may be  determined  from  time to time by the  Board  and  stated  in the
resolution or  resolutions  providing for the issuance of such  Preferred  Stock
(collectively, a "Preferred Stock Designation").

         Section 3.  Common  Stock.  Except as may  otherwise  be  provided in a
Preferred Stock Designation, the holders of Common Stock will be entitled to one
vote on each matter  submitted to a vote at a meeting of  stockholders  for each
share of Common  Stock held of record by such  holder as of the record  date for
such meeting.

         FIFTH.  The  Board may make,  amend,  and  repeal  the  By-Laws  of the
Company.  Any By-Law made by the Board under the powers  conferred hereby may be
amended or repealed by the Board or by the  stockholders  in the manner provided
in the  By-Laws of the  Company.  Notwithstanding  the  foregoing  and  anything
contained in this  Amended and  Restated  Certificate  of  Incorporation  to the
contrary, By-Laws 3, 8, 10, 11, 12, 13, and 39 may not be amended or repealed by
the stockholders,  and no provision inconsistent therewith may be adopted by the
stockholders, without the affirmative vote of the holders of at least 80% of the
Voting Stock,  voting together as a single class. The Company may in its By-Laws
confer powers upon the Board in addition to the foregoing and in addition to the
powers and authorities expressly conferred upon the Board by applicable law. For
the purposes of this Amended and Restated Certificate of Incorporation,  "Voting
Stock"  means  stock of the  Company  of any  class or series  entitled  to vote
generally in the election of Directors.  Notwithstanding  anything  contained in
this Amended and Restated  Certificate  of  Incorporation  to the contrary,  the
affirmative  vote of the  holders  of at least 80% of the Voting  Stock,  voting
together as a single  class,  is  required  to amend or repeal,  or to adopt any
provisions inconsistent with, this Article Fifth.

         SIXTH.  Subject to the rights of the holders of any series of Preferred
Stock:

                  (a) any  action  required  or  permitted  to be  taken  by the
         stockholders of the Company must be effected at a duly called annual or
         special  meeting of stockholders of the Company and may not be effected
         by any consent in writing of such stockholders; and

                  (b)  special  meetings of  stockholders  of the Company may be
         called only by (i) the Chairman of the Board (the  "Chairman")  or (ii)
         the Secretary of the Company (the "Secretary")  within 10 calendar days
         after receipt of the written  request of a majority of the total number
         of  Directors  which the Company  would have if there were no vacancies
         (the "Whole Board").

At any annual meeting or special meeting of  stockholders  of the Company,  only
such business  will be conducted or  considered as has been brought  before such
meeting in the

                                       3
<PAGE>

manner  provided  in  the  By-Laws  of  the  Company.  Notwithstanding  anything
contained in this  Amended and  Restated  Certificate  of  Incorporation  to the
contrary,  the  affirmative  vote of at least 80% of the  Voting  Stock,  voting
together as a single  class,  will be required to amend or repeal,  or adopt any
provision inconsistent with, this Article Sixth.

         SEVENTH. Section 1. Number,  Election, and Terms of Directors.  Subject
to the rights,  if any, of the holders of any series of Preferred Stock to elect
additional  Directors  under  circumstances   specified  in  a  Preferred  Stock
Designation,  the number of the  Directors  of the Company will not be less than
three  nor  more  than 12 and  will be  fixed  from  time to time in the  manner
described in the By-Laws of the Company. The Directors, other than those who may
be elected by the holders of any series of Preferred  Stock,  will be classified
with  respect  to the time for which  they  severally  hold  office  into  three
classes,  as nearly equal in number as possible,  designated  Class I, Class II,
and Class III. The Directors  first  appointed to Class I will hold office for a
term expiring at the first annual meeting of  stockholders  to be held following
the filing of this  Certificate;  the Directors first appointed to Class II will
hold office for a term expiring at the second annual meeting of  stockholders to
be held  following  the  filing of this  Certificate;  and the  Directors  first
appointed to Class III will hold office for a term  expiring at the third annual
meeting of  stockholders  to be held  following the filing of this  Certificate,
with the members of each class to hold office until their successors are elected
and qualified.  At each  succeeding  annual meeting of the  stockholders  of the
Company,  the  successors  of the class of Directors  whose terms expire at that
meeting will be elected by  plurality  vote of all votes cast at such meeting to
hold office for a term expiring at the annual  meeting of  stockholders  held in
the third year  following the year of their  election.  Election of Directors of
the Company need not be by written ballot unless requested by the Chairman or by
the holders of a majority of the Voting Stock  present in person or  represented
by proxy at a meeting of the stockholders at which Directors are to be elected.

         Section  2.  Nomination  of  Director  Candidates.  Advance  notice  of
stockholder  nominations  for the  election  of  Directors  must be given in the
manner provided in the By-Laws of the Company.

         Section 3. Newly Created  Directorships  and Vacancies.  Subject to the
rights,  if any,  of the  holders  of any  series  of  Preferred  Stock to elect
additional  Directors  under  circumstances   specified  in  a  Preferred  Stock
Designation,  newly  created  directorships  resulting  from any increase in the
number of  Directors  and any  vacancies  on the  Board  resulting  from  death,
resignation, disqualification,  removal, or other cause will be filled solely by
the  affirmative  vote of a majority of the remaining  Directors then in office,
even though less than a quorum of the Board,  or by a sole  remaining  Director.
Any Director elected in accordance with the preceding  sentence will hold office
for the  remainder  of the full term of the class of  Directors in which the new
directorship  was  created or the  vacancy  occurred  and until such  Director's
successor has been elected and qualified. No decrease in the number of Directors
constituting the Board may shorten the term of any incumbent Director.


                                       4
<PAGE>

         Section 4.  Removal.  Subject to the rights,  if any, of the holders of
any series of Preferred Stock to elect additional  Directors under circumstances
specified  in a Preferred  Stock  Designation,  any Director may be removed from
office by the  stockholders  only for cause and only in the manner  provided  in
this Section 4. At any annual  meeting or special  meeting of the  stockholders,
the notice of which  states that the removal of a Director or Directors is among
the purposes of the meeting, the affirmative vote of the holders of at least 80%
of the Voting Stock, voting together as a single class, may remove such Director
or Directors for cause.  Except as may be provided by applicable  law, cause for
removal will be deemed to exist only if the Director  whose  removal is proposed
has been  adjudged  by a court of  competent  jurisdiction  to be  liable to the
Company or its  stockholders  for misconduct as a result of (a) a breach of such
Director's  duty of  loyalty to the  Company,  (b) any act or  omission  by such
Director not in good faith or which involves a knowing  violation of law, or (c)
any transaction from which such Director derived an improper  personal  benefit,
and such adjudication is no longer subject to direct appeal.

         Section 5. Amendment,  Repeal, Etc.  Notwithstanding anything contained
in this Amended and Restated  Certificate of Incorporation to the contrary,  the
affirmative  vote of at least 80% of the  Voting  Stock,  voting  together  as a
single  class,  is  required  to  amend  or  repeal,   or  adopt  any  provision
inconsistent with, this Article Seventh.

         EIGHTH.  Section 1. Notwithstanding any other provision of this Amended
and Restated  Certificate of Incorporation  and except as set forth in Section 2
of this  Article  EIGHTH,  the  affirmative  vote of at least 80% of the  Voting
Stock, voting together as a single class, shall be required:

                  I.  For  the  adoption  of any  agreement  for the  merger  or
         consolidation of the Company or any Subsidiary (as defined in Section 5
         of this  Article  EIGHTH)  with or into any other person (as defined in
         Section 5 of this Article EIGHTH).

                  II. To authorize any sale, lease,  transfer or exchange of, or
         any  mortgage  or  pledge  of or the  granting  of any  other  security
         interest in, or any other  disposition of, all or any substantial  part
         of the  assets of the  Company or any  Subsidiary  to or with any other
         person   (in  a  single   transaction   or  in  a  series  of   related
         transactions).

                  III. To  authorize  the issuance or transfer by the Company or
         any  Subsidiary  of any  securities  of the  Company or any  Subsidiary
         (except securities issued pursuant to a stock option,  purchase,  bonus
         or other plan or  arrangement,  for natural  persons who are directors,
         employees, consultants and/or agents of the Company or a Subsidiary, or
         securities  issued upon exercise of any  conversion  rights,  warrants,
         options  or rights  which  shall have been  outstanding  at the time of
         adoption  of this  Article  EIGHTH or which shall have been issued in a
         transaction  not in  contravention  of the  provisions  of this Article
         EIGHTH) to any other person in exchange for cash,  securities  or other
         assets  or a  combination  thereof,  if,  in  the  case  of  any of the
         foregoing transactions (as of the date of any action taken by the Board

                                       5
<PAGE>
         with respect to any such proposed transaction, or as of the record date
         for the determination of stockholders entitled to notice of and to vote
         on  any  such  proposed   transaction  or  immediately   prior  to  the
         consummation of any such proposed  transaction),  such other person is,
         or at any time within the preceding 12 months has been,  the beneficial
         owner, directly or indirectly, of 20 percent or more of the outstanding
         shares of Voting Stock of the Company.

   
         Section 2. The provisions of Section 1 of this Article EIGHTH shall not
apply to (1) any  transaction  described in such Section 1 if the Board shall by
resolution  have  approved a memorandum  of agreement  with such person  setting
forth  the  principal  terms  of  such   transaction  and  such  transaction  is
substantially consistent therewith,  provided that a majority of those directors
voting in favor of such  resolution  are  Continuing  Directors  (as  defined in
Section 5 of this Article EIGHTH), (2) any transaction described in such Section
1 if the other party to such  transaction  is a Major  Subsidiary (as defined in
Section 5 of this  Article  EIGHTH)  or (3) any  transaction  described  in such
Section 1 (other than a merger or  consolidation to which the Company would be a
party)  if the  fair  value of the  securities,  assets  or other  consideration
proposed to be issued or  transferred,  in any way disposed of, or received,  by
the Company or any  Subsidiary in connection  with any such  transaction  or any
series of such transactions which are related is less than $5,000,000.
    

         Section 3.  Notwithstanding  any other  provisions  of this Amended and
Restated  Certificate of  Incorporation  and except as set forth in Section 4 of
this Article EIGHTH, the affirmative vote of the holders of at least 80 % of the
Voting Stock, voting together as a single class, shall be required:

                  I.  To authorize a liquidation or dissolution of the Company,

                  II. To authorize  any offer by the Company to purchase  shares
         of  its  outstanding   Voting  Stock  (except  pursuant  to  redemption
         provisions of any preferred stock of the Company),

                  III. To authorize  any  reclassification  of securities of the
         Company,  any  recapitalization  or any other  transaction in each case
         designed  to  decrease  the number of  holders  of Voting  Stock of the
         Company,

if (as of the date of any  action  taken by the Board  with  respect to any such
proposed  transaction,  or as of  the  record  date  for  the  determination  of
stockholders  entitled to notice of and to vote on any such proposed transaction
or immediately  prior to the consummation of any such proposed  transaction) any
other person is the beneficial  owner,  directly or indirectly,  of 5 percent or
more of the outstanding shares of Voting Stock of the Company.

   
         Section 4. The provisions of Section 3 of this Article EIGHTH shall not
apply to any  transaction  described  in such  Section 3 if the  Board  shall by
resolution have approved a memorandum  setting forth the principal terms of such
transaction and such transaction is


                                       6
<PAGE>

substantially consistent therewith,  provided that a majority of those directors
voting in favor of such  resolution  are  Continuing  Directors  (as  defined in
Section 5 of this Article EIGHTH).
    

         Section 5.  For the purpose of this Article EIGHTH:

                  I. Any person shall be deemed to be the "beneficial  owner" of
         any  shares  of stock of the  Company  (i) which it owns,  directly  or
         indirectly,  whether  of  record  or not,  or which it has the right to
         acquire  pursuant to any  agreement,  or upon  exercise  of  conversion
         rights,   warrants  or  options,  or  otherwise,   or  (ii)  which  are
         beneficially  owned,  directly or indirectly  (including  shares deemed
         owned  through  application  of clause (i) above),  by any other person
         which is its  affiliate or associate  (as defined in this Section 5) or
         with which it or any of its affiliates or associates has any agreement,
         arrangement  or  understanding  for the purpose of acquiring,  holding,
         voting or disposing of stock of the Company.  The outstanding shares of
         any class of stock of the  Company  shall be deemed to  include  shares
         deemed owned,  through  application of clauses (i) and (ii) above,  but
         shall not include any other  shares  which may be issuable  pursuant to
         any  agreement,  or upon  exercise of  conversion  rights,  warrants or
         options, or otherwise.

                  II. An "affiliate"  of a specified  person is any person that,
         directly  or  indirectly,  controls  or is  controlled  by, or is under
         common  control with,  the person  specified.  For the purposes of this
         definition,  "control" (including, with correlative meanings, the terms
         "controlled by" and "under common control with"),  as used with respect
         to any person,  shall mean the possession,  directly or indirectly,  of
         the  power to  direct  or cause the  direction  of the  management  and
         policies of the  specified  person,  whether  through the  ownership of
         voting securities or by contract or otherwise.

                  III.  The term  "associates"  used to indicate a  relationship
         with any specified  person means (i) any person in which such specified
         person  has a  significant  financial  interest  or as  to  which  such
         specified  person's  relationship  is such that such  specified  person
         substantially  influences  its  management  and  policies or any person
         having a significant  financial  interest in such  specified  person or
         which  substantially  influences  the  management  and policies of such
         specified  person,  and without  limitation to the foregoing,  (ii) any
         person of which  such  specified  person  is an  officer,  director  or
         partner  or is,  directly  or  indirectly,  the  beneficial  owner of 5
         percent or more of any class of equity  securities,  (iii) any trust or
         other  estate  in  which  such  specified   person  has  a  substantial
         beneficial  interest or as to which such person serves as trustee or in
         a similar fiduciary  capacity,  and (iv) any relative or spouse of such
         specified person, or any relative of such spouse, who has the same home
         as such  specified  person  or who is a  director  or  officer  of such
         specified person or any corporation  which controls or is controlled by
         such specified person.

                  IV. A "person" is any individual, corporation or other entity.

                                       7
<PAGE>

                  V. The term "securities"  shall include,  without  limitation,
         any stocks, bonds, debentures, notes and evidences of indebtedness, and
         any warrants,  options and other rights to subscribe to or purchase any
         of the foregoing.

                  VI.  A  "Subsidiary"  is any  corporation  of which at least a
         majority of the  outstanding  shares of equity stock is owned of record
         or  beneficially  by the  Company  and/or  its  Subsidiaries.  A "Major
         Subsidiary"  is any  corporation  of which at least 80  percent  of the
         outstanding  shares of equity stock is owned of record and beneficially
         by the Company and/or its Major Subsidiaries.

   
                  VII. The term  "Continuing  Director"  shall mean a person who
         was a duly  elected  and acting  director of the Company at the time of
         the adoption of this Article EIGHTH or became a duly elected and acting
         director of the  Company  prior to the time that,  for the  purposes of
         Section 2 or  Section  4, as the case may be, of this  Article  EIGHTH,
         such other person became a beneficial owner, directly or indirectly, of
         5  percent  or more of the  Voting  Stock of the  Company,  or a person
         designated  (whether  before or after  election as a director)  to be a
         Continuing Director by a majority of the Continuing Directors.

         Section 6. A majority of the Continuing  Directors shall have the power
and duty to determine for the purposes of this Article  EIGHTH,  on the basis of
information  known to them,  whether a  proposed  transaction  is subject to the
provisions of Section 1 or Section 3 of this Article  EIGHTH,  and in particular
and without  limitation,  whether (1) any person  beneficially owns 5 percent or
more of the outstanding shares of Voting Stock of the Company, (2) any person is
an  "affiliate"  or  "associate"  of any other  person,  (3) any  person  has an
agreement,  arrangement or understanding with any other person, (4) any proposed
transaction  involves a  substantial  part of the  assets of the  Company or any
Subsidiary,  (5) the fair  value of  securities,  assets or other  consideration
referred to in Section 2 of this Article EIGHTH is less than $5,000,000, (6) any
series of  transactions  are  related,  and (7) the  memorandum  referred  to in
Section 2 or Section 4 of this Article EIGHTH is  substantially  consistent with
the transaction to which it relates.  Any such determination shall be conclusive
and binding for all purposes of this Article EIGHTH.
    

         Section  7.  The  affirmative  vote of  stockholders  required  by this
Article  EIGHTH shall be in lieu of any lesser vote or consent of the holders of
the stock of the Company otherwise  required by law or in any agreement to which
the  Company is a party,  and shall be in  addition  to any voting  requirements
imposed by law or any other  provisions of the Amended and Restated  Certificate
of  Incorporation  of the  Company,  including  resolutions  providing  for  the
issuance  of a class or  series  of  stock  adopted  by the  Board  pursuant  to
authority vested in it by the provisions of the Amended and Restated Certificate
of Incorporation, in favor of certain classes of stock.

         Section 8. No amendment to this  Amended and  Restated  Certificate  of
Incorporation,  directly or  indirectly by merger,  consolidation  or otherwise,
shall amend, alter, change or

                                       8
<PAGE>

repeal any of the  provisions  of this  Article  EIGHTH,  unless  the  amendment
effecting  such  amendment,  alteration,  change or  repeal  shall  receive  the
affirmative vote of the holders of at least 80 percent of the outstanding shares
of stock of the Company  entitled to vote in  elections of  directors;  provided
that this Section 8 shall not apply to any such  amendment if such  amendment is
submitted to the stockholders for adoption with the unanimous  recommendation of
the entire Board.

         NINTH. To the full extent permitted by the Delaware General Corporation
Law or any other applicable law currently or hereafter in effect, no Director of
the Company will be personally  liable to the Company or its stockholders for or
with respect to any acts or omissions in the performance of his or her duties as
a Director of the Company. Any repeal or modification of this Article Ninth will
not  adversely  affect  any right or  protection  of a Director  of the  Company
existing prior to such repeal or modification.

         TENTH.  Each person who is or was or had agreed to become a Director or
officer of the  Company,  and each such  person who is or was serving or who had
agreed to serve at the  request of the Board or an officer of the  Company as an
employee or agent of the Company or as a director,  officer,  employee, or agent
of another  corporation,  partnership,  joint venture,  trust,  or other entity,
whether  for  profit  or  not  for  profit  (including  the  heirs,   executors,
administrators, or estate of such person), will be indemnified by the Company to
the full extent permitted by the Delaware  General  Corporation Law or any other
applicable law as currently or hereafter in effect. The right of indemnification
provided in this Article  Tenth (a) will not be exclusive of any other rights to
which any person seeking  indemnification  may otherwise be entitled,  including
without limitation  pursuant to any contract approved by a majority of the Whole
Board  (whether or not the  Directors  approving  such contract are or are to be
parties to such  contract or similar  contracts),  and (b) will be applicable to
matters  otherwise  within its scope  whether or not such matters arose or arise
before or after  the  adoption  of this  Article  Tenth.  Without  limiting  the
generality or the effect of the  foregoing,  the Company may adopt  By-Laws,  or
enter  into  one  or  more  agreements  with  any  person,   which  provide  for
indemnification greater or different than that provided in this Article Tenth or
the DGCL.  Notwithstanding  anything  contained  in this  Amended  and  Restated
Certificate  of  Incorporation  to the contrary,  the amendment or repeal of, or
adoption of any provision inconsistent with, this Article Tenth will require the
affirmative  vote of the  holders  of at least 80% of the Voting  Stock,  voting
together  as a single  class.  Any  amendment  or repeal of, or  adoption of any
provision  inconsistent  with, this Article Tenth will not adversely  affect any
right or protection  existing  hereunder  prior to such  amendment,  repeal,  or
adoption.

         ELEVENTH:  Whenever a compromise or arrangement is proposed between the
Company and its  creditors  or any class of them and/or  between the Company and
its  stockholders  or any  class of them,  any court of  equitable  jurisdiction
within the State of  Delaware  may, on the  application  in a summary way of the
Company or any  creditor or  stockholder  thereof or on the  application  of any
receiver or receivers appointed for the

                                       9
<PAGE>
Company  under the  provisions of Section 291 of Title 8 of the Delaware Code or
on the  application  of trustees in  dissolution or of any receiver or receivers
appointed for the Company under the  provisions of Section 279 of Title 8 of the
Delaware Code, order a meeting of the creditors or class of creditors, and/or of
the stockholders or class of stockholders,  of the Company,  as the case may be,
to be summoned in such manner as the said court directs. If a majority in number
representing  three-fourths  in value of the  creditors  or class of  creditors,
and/or of the stockholders or class of stockholders, of the Company, as the case
may be, agree to any compromise or arrangement and to any  reorganization of the
Company as a consequence of such compromise or arrangement,  the said compromise
or arrangement and the said reorganization  shall, if sanctioned by the court to
which the said  application  has been made,  be binding on all the  creditors or
class of creditors, and/or on all the stockholders or class of stockholders,  of
the Company, as the case may be, and also on the Company.


         3. This  Amended and Restated  Certificate  of  Incorporation  was duly
adopted in accordance with the provisions of Sections 242 and 245 of the General
Corporation  Law of the  State  of  Delaware  by  written  consent  of the  sole
stockholder  in lieu  of a  meeting  of  stockholders  in  accordance  with  the
provisions  of  Section  228 of the  General  Corporation  Law of the  State  of
Delaware.


   
IN  WITNESS  WHEREOF,  said  Sentry  Technology   Corporation  has  caused  this
certificate  to be  signed  by  Thomas A.  Nicolette,  its  President  and Chief
Executive Officer, and attested by Peter J. Mundy, its Secretary,  this ____ day
of __________, 1997.


                                       10
<PAGE>


         Signed and attested to this __ day of _________, 1997.



                                         SENTRY TECHNOLOGY
                                         CORPORATION


                                         -----------------------------
                                         Name:    Thomas A. Nicolette
                                         Title:   President and Chief Executive
                                                  Officer

    

Attest:


- -------------------------------
Name:    Peter J. Mundy
Title:   Secretary


                                       11
<PAGE>

                           CERTIFICATE OF DESIGNATIONS

          CERTIFICATE OF THE VOTING POWERS, DESIGNATIONS, PREFERENCES,
           RIGHTS, QUALIFICATIONS, LIMITATIONS AND RESTRICTIONS OF THE
                           SERIES A PREFERRED STOCK OF

                          SENTRY TECHNOLOGY CORPORATION

                   -------------------------------------------

                         Pursuant to Section 151 of the
                           General Corporation Law of
                              the State of Delaware

                   -------------------------------------------

   
         SENTRY  TECHNOLOGY  CORPORATION,  a corporation  organized and existing
under the General Corporation Law of the State of Delaware (the  "Corporation"),
in accordance with the provisions of Section 151 of the General  Corporation law
of the State of Delaware,  does hereby certify that the following resolution was
duly adopted by the Board of Directors of the Corporation on January 14, 1997;

         RESOLVED,  that pursuant to the authority expressly vested in the Board
of Directors of the  Corporation  by Article  Fourth of the Amended and Restated
Certificate of Incorporation  of the Corporation,  the Board of Directors hereby
fixes   and   determines   the   voting   rights,   designations,   preferences,
qualifications,  privileges,  limitations,  options  and  other  rights  of  the
6,000,000  shares of Class A Preferred  Stock,  par value  $0.001 per share (the
"Class A Preferred Stock") of the Corporation as follows:
    


                  1. Rank.  The Class A Preferred  Stock shall,  with respect to
dividend rights and rights on liquidation,  winding up or dissolution,  rank (i)
on parity  with,  or junior to, as the case may be, any other class or series of
Preferred Stock established by the Board, the terms of which shall  specifically
provide that such class or series  shall rank on parity with,  or senior to, the
Class  A  Preferred  Stock  with  respect  to  dividend  rights  and  rights  on
liquidation,  winding up or  dissolution,  and (ii)  except as set forth  below,
prior to any other equity securities of the Corporation with respect to dividend
rights and rights on liquidation,  winding up or dissolution (all of such equity
securities of the  Corporation to which the Class A Preferred Stock ranks prior,
including  the  Corporation's  common  stock,  par value  $0.001  per share (the
"Common  Stock")  are at times  collectively  referred  to herein as the "Junior
Stock").

                  2. Dividend.

  
                                       12

<PAGE>


   
                           (a) The  annual  dividend  rate on each  share of the
Class A Preferred  Stock shall be fixed at five  percent (5%) of the Face Value,
payable in accordance  with this  paragraph 2 (the  "Dividend").  The holders of
shares of the Class A Preferred Stock shall be entitled to receive  Dividends on
the following  dates (each,  a "dividend  payment  date"):  February 6, 1998 and
1999,  August 6,  1999 and 2000,  and  February  6, 2000 and 2001;  the 12 month
period  ending on each of the first two  dividend  payment  dates is an  "annual
dividend  period," the six month period ending on each of the next four dividend
payment dates is a "semi-annual  dividend  period" and each such annual dividend
period or semi-annual dividend period is a "dividend period." Dividends (whether
or not declared) shall be payable in additional  shares of the Class A Preferred
Stock during the two annual  dividend  periods  ending on the first two dividend
payment dates subsequent to issuance of the Class A Preferred  Stock,  such that
holders shall receive a Dividend of 1/20th of a share of Class A Preferred Stock
for each share of Class A  Preferred  Stock  held.  Thereafter,  the  holders of
shares  of the  Class A  Preferred  Stock  shall  be  entitled  to  receive,  in
preference  to  dividends on the Junior  Stock,  and whether or not declared the
Dividend  (including  any Dividend  accrued and unpaid)  payable in cash, out of
funds legally  available  for the payment of dividends,  such that holders shall
receive a Dividend  of $0.25 for each  share of Class A  Preferred  Stock  held,
which Dividend shall accrue  semi-annually  and be due in equal  installments on
each of the last four dividend  payment  dates.  Dividends  shall be paid on the
applicable  dividend  payment  date to the  holders  of  record  at the close of
business on the date (the "record date") specified by the Board at the time such
Dividend is declared; provided, however, that such record date shall not be more
than 60 days nor less  than 10 days  prior to the  applicable  dividend  payment
date. For the purposes of this paragraph,  each additional  share of the Class A
Preferred  Stock  issued  as a  Dividend  shall be  valued  at the  Face  Value.
Dividends  (whether  payable in cash or in stock) shall be fully  cumulative and
shall  accrue,  with  additional  payments  thereon,  from the  first day of the
dividend  period in which such Dividend may be payable as herein provided on all
shares of the Class A Preferred Stock issued and outstanding on the first day of
such dividend  period,  except that with respect to the initial dividend period,
such Dividend shall accrue from the date of issue. If the dividend  payment date
is not a business  day, the dividend  payment date shall be the next  succeeding
business day.
    

                           (b) All Dividends  paid with respect to shares of the
Class A Preferred Stock pursuant to paragraph 2(a) shall be paid pro rata to the
holders entitled thereto.

                           (c) If at any time the Corporation  shall have failed
to pay all dividends which have accrued on any  outstanding  shares of any other
class or series of the Preferred Stock having cumulative dividend rights ranking
on  parity  with the  shares of the Class A  Preferred  Stock at the times  such
dividends are payable or the Corporation  shall fail to redeem any of such stock
on the date set for the redemption  thereof,  no cash Dividend shall be declared
by the Board or paid or set apart for  payment by the  Corporation  on shares of
the  Class  A  Preferred  Stock  unless  prior  to  or  concurrently  with  such
declaration,  payment or  setting  apart for  payment,  all  accrued  and unpaid
dividends on all outstanding  shares of such other series of the Preferred Stock
shall have been or be declared,  paid or set apart for payment,  with additional
payments thereon, if any; provided,  however,  that in the event such failure to
pay accrued  dividends  is with respect  only to the  

  
                                       13


<PAGE>

outstanding  shares of the Class A Preferred Stock and any outstanding shares of
any other class or series of the  Preferred  Stock  having  cumulative  dividend
rights on parity with the shares of the Class A Preferred Stock,  cash dividends
may be declared, paid or set apart for payment, with additional payment thereon,
pro rata on shares of the Class A Preferred Stock and shares of such other class
or series  of the  Preferred  Stock so that the  amounts  of any cash  dividends
declared, paid or set apart for payment on shares of the Class A Preferred Stock
and shares of such other series of the  Preferred  Stock shall in all cases bear
to each other the same ratio that, at the time of such  declaration,  payment or
setting  apart for payment,  all accrued but unpaid cash  dividends on shares of
the Class A  Preferred  Stock and shares of such other  series of the  Preferred
Stock bear to each other.  Any Dividend not paid  pursuant to paragraph  2(a) or
this paragraph 2(c) shall be fully  cumulative and shall accrue with  additional
payments thereon, as set forth in paragraph 2(a).

                           (d) (i)  Holders  of shares of the Class A  Preferred
         Stock  shall be  entitled  to receive  the  Dividends  provided  for in
         paragraph  2(a) in  preference  to and in priority  over any  dividends
         other than dividends paid in Junior Stock upon any of the Junior Stock.

                           (ii) So long as any  shares of the Class A  Preferred
         Stock are outstanding,  the Corporation  shall not declare,  pay or set
         apart for payment any  dividend on any of the Junior  Stock (other than
         dividends paid in such Junior Stock) or make any payment on account of,
         or set apart for payment money for a sinking or other similar fund for,
         the  purchase,  redemption  or other  retirement  of, any of the Junior
         Stock or any warrants,  rights, calls or options exercisable for any of
         the Junior Stock, or make any distribution in respect  thereof,  either
         directly or indirectly,  and whether in cash,  obligations or shares of
         the capital  stock of the  Corporation  or other  property  (other than
         distributions or dividends in stock to the holders of such stock),  and
         shall not permit any corporation or other entity directly or indirectly
         controlled by the  Corporation  to purchase or redeem any of the Junior
         Stock or any warrants,  rights, calls or options exercisable for any of
         the  Junior  Stock,   unless  prior  to  or   concurrently   with  such
         declaration,   payment,   setting   apart  for  payment,   purchase  or
         distribution,  as  the  case  may  be,  all  accrued  and  unpaid  cash
         Dividends,  including  additional  payments  thereon,  on shares of the
         Class A Preferred  Stock not paid in accordance  with the provisions of
         paragraph  2(a)  shall have been or be paid and the  Corporation  shall
         have redeemed  those shares of the Class A Preferred  Stock required to
         be redeemed theretofore by the terms hereof.

                           (e)  Subject  to the  foregoing  provisions  of  this
paragraph 2, the Board may declare and the  Corporation may pay or set apart for
payment  dividends and other  distributions  on any of the Junior Stock, and may
purchase or otherwise redeem any of the Junior Stock or any warrants,  rights or
options  exercisable  for any of the Junior  Stock;  provided,  however,  that a
decision  by the Board to declare a dividend  on any of the Junior  Stock  shall
require  approval by that number of directors  representing at least 66b% of the
Board,  less any vacancies on the Board. In such event, the holders of the Class
A  Preferred  Stock and the holders of such  Junior  Stock shall share  equally,
share and share alike, in the distribution of any and all dividends  declared on
such  

                                       14


<PAGE>

Junior  Stock,  provided  that for this  purpose each share of Class A Preferred
Stock shall be treated as one share of such Junior Stock.

                           (f) The  Corporation  shall not be  required to issue
fractional  shares  of Class A  Preferred  Stock as a result of the  payment  of
Dividends.  If any  fraction  of a share of  Class A  Preferred  Stock  would be
issuable upon the payment of a Dividend, the Corporation may, in lieu of issuing
such  fractional  share,  pay to such holder for any such fraction of a share an
amount in cash equal to the product obtained by multiplying (i) such fraction by
(ii) the Face Value.

   
                           (g)  Whenever,  at any time or  times,  any  Dividend
payable  shall be, and  continue,  in arrears,  the  holders of the  outstanding
shares of Class A Preferred Stock shall have the right,  voting  separately as a
class, to elect two directors of the Corporation. Upon the vesting of such right
of the holders of Class A Preferred  Stock,  the  maximum  authorized  number of
members  of the  Board  shall  automatically  be  increased  by two  and the two
vacancies so created  shall be filled by vote of the holders of the  outstanding
shares of Class A Preferred Stock. The right of the holders of Class A Preferred
Stock to elect members of the Board as aforesaid  shall continue until such time
as all  Dividends  in arrears  shall have been paid in full,  at which time such
right shall terminate, except as herein or by law expressly provided, subject to
revesting  in the event of each and every  subsequent  default of the  character
above described.  Upon termination of such special voting rights attributable to
holders of the Class A Preferred Stock pursuant to this  paragraph,  the term of
office of any  directors  elected by the  holders of shares of Class A Preferred
Stock (any such director, a "Class A Preferred Stock Director") pursuant to such
special  voting rights shall  immediately  terminate and the number of directors
constituting  the entire  Board  shall be reduced by two.  Any Class A Preferred
Stock Director may be removed by, and shall not be removed  otherwise than by, a
majority  vote of the  outstanding  shares of Class A  Preferred  Stock.  If the
office of any  Class A  Preferred  Stock  Director  becomes  vacant by reason of
death,  resignation,  retirement,  disqualification,  removal  from  office,  or
otherwise,  a successor who shall hold office for the unexpired  term in respect
of  which  such  vacancy  occurred  shall  be  elected  by  the  holders  of the
outstanding shares of Class A preferred Stock, voting separately as a class.
    

                  3. Adjustment of Hurdle Price.

                           (a) To  preserve  the  actual or  potential  economic
value of the  Class A  Preferred  Stock,  if at any time  after the date of this
Amended and Restated  Certificate of Incorporation  (the  "Certificate"),  there
shall be any change in the Common Stock,  whether by reason of stock  dividends,
stock  splits,  recapitalizations,   mergers,  consolidations,  combinations  or
exchanges of securities, split-ups, split-offs,  spin-offs,  liquidations, other
similar changes in capitalization, any distribution or issuance of cash, assets,
evidences of indebtedness or subscription rights, options or warrants to holders
of Common Stock (other than regular cash dividends) or otherwise,  then, in each
such event the Board shall make such appropriate adjustments in the Hurdle Price
(as defined below) such that following  such  adjustments,  such event shall not
have had the effect of increasing, reducing or limiting the benefits the holders
of shares of Class A Preferred Stock would have had absent such event.

                                       15


<PAGE>

                           (b) The "Deemed Value" as used herein shall equal the
Face Value plus the amount by which the Closing  Price  exceeds the Hurdle Price
on the date of the relevant event.  The "Hurdle Price" as used herein shall mean
the amount that is the average of the closing prices for a share of Common Stock
on the twenty (20)  consecutive  trading  days  ending on the trading  date last
preceding the first  anniversary  of the first issuance of the Class A Preferred
Stock;  provided,  however, that in no event shall the Hurdle Price be less than
$5.00 or more  than  $6.50,  such that (x) if such  average  amount is less than
$5.00, the Hurdle Price shall equal $5.00 and (y) if such average amount is more
than $6.50, the Hurdle Price shall equal $6.50; and provided,  further, that the
Hurdle Price shall be subject to adjustment as set forth in paragraph  3(a). The
"Closing  Price" as used herein shall mean the average of the closing prices for
a share of Common  Stock on the twenty (20)  consecutive  trading days ending on
the trading  date last  preceding an optional  redemption  date,  the  Mandatory
Redemption Date (as defined below),  the date of an event described in paragraph
4(a) above or the closing date of an Acquisition (as defined below), as the case
may be, as reported on the National  Association of Securities  Dealers,  Inc.'s
Automated  Quotations  System  ("NASDAQ") or if such closing prices shall not be
reported on NASDAQ, the average of the closing prices,  regular way, for a share
of such security on the  principal  national  securities  exchange on which such
security is listed on such  twenty (20)  consecutive  trading  days,  or if such
security is not listed on any national securities  exchange,  the average of the
mean  between the closing  bid and asked  prices of a share of such  security on
such twenty (20) consecutive  trading days as reported,  or if such prices shall
not be so  reported,  as the same shall be  reported by the  National  Quotation
Bureau,  Incorporated or, in all other cases, the value set in good faith by the
Board.

                  4. Liquidation Preference.

                           (a) In the  event  of any  voluntary  or  involuntary
liquidation,  dissolution or winding up of the affairs of the  Corporation,  the
holders  of shares of the Class A  Preferred  Stock  then  outstanding  shall be
entitled  to be  paid  out  of  the  assets  of the  Corporation  available  for
distribution to its  stockholders  an amount in cash for each share  outstanding
equal to (i) the  Deemed  Value on the date of such an event plus (ii) an amount
in cash equal to all  accrued  but unpaid  Dividends  thereon,  plus  additional
dividends  on  unpaid  Dividends  accrued  prior  to  the  commencement  of  the
then-current  dividend  period,  to the date fixed for  liquidation,  before any
payment  shall be made or any assets  distributed  to the  holders of any of the
Junior Stock. If the assets of the Corporation are not sufficient to pay in full
the  liquidation  payments  payable to the holders of outstanding  shares of the
Class A  Preferred  Stock and any other class or series of the  Preferred  Stock
having  liquidation  rights on parity  with the shares of the Class A  Preferred
Stock,  then  the  holders  of all  such  shares  shall  share  ratably  in such
distribution  of assets in accordance  with the amount which would be payable on
such  distribution if the amounts to which the holders of outstanding  shares of
the Class A Preferred Stock and the holders of outstanding  shares of such other
series of the Preferred Stock are entitled were paid in full.

                                       16


<PAGE>

                           (b) The  liquidation  payment  with  respect  to each
fractional  share of the Class A Preferred Stock  outstanding,  if any, shall be
equal to a ratably  proportionate amount of the liquidation payment with respect
to each outstanding share of the Class A Preferred Stock.

                           (c) For  purposes of this  paragraph  4,  neither the
voluntary  sale,  conveyance,  exchange or transfer (for cash,  shares of stock,
securities or other  consideration)  of all or substantially all the property or
assets of the  Corporation  nor the  consolidation  or merger of the Corporation
with  one or more  other  corporations  shall  be  deemed  to be a  liquidation,
dissolution or winding up, voluntary or involuntary, unless such voluntary sale,
conveyance,  exchange or transfer  shall be in connection  with a dissolution or
winding up of the business of the Corporation.

                           (d)  Any  sale,   lease  or   conveyance  of  all  or
substantially all of the Corporation's  assets or merger or consolidation of the
Corporation  which  results  in the  holders of the Common  Stock  receiving  in
exchange  for such  Common  Stock  either  cash or  notes,  debentures  or other
evidences of  indebtedness  or obligations to pay cash or preferred stock of the
surviving  entity  which  ranks on parity  with the Class A  Preferred  Stock in
liquidation  or dividends  shall be deemed to be a  liquidation,  dissolution or
winding  up of the  affairs  of the  Corporation  within  the  meaning  of  this
paragraph 4. In the cases of merger or  consolidation  of the Corporation  where
holders of the Common Stock receive,  in exchange for such Common Stock,  common
stock or preferred  stock which is junior in  liquidation  and  dividends to the
Class A Preferred  Stock in the surviving  entity (whether or not such surviving
entity is the Corporation) of such merger or consolidation or preferred stock of
another  entity,  the Class A Preferred  Stock  shall be deemed to be  preferred
stock of such  surviving  entity or other  entity,  as the case may be, with the
same annual  dividend rate and equivalent  rights to the rights set forth herein
and the merger or  consolidation  agreement shall  expressly so provide.  In the
event of a merger or  consolidation of the Corporation  where the  consideration
received by the holders of the Common Stock consists of two or more of the types
of  consideration  set forth above,  the holders of the Class A Preferred  Stock
shall be entitled to receive either cash or securities  based upon the foregoing
in the same proportion as the holders of the Common Stock of the Corporation are
receiving cash or debt securities,  or equity securities in the surviving entity
or another entity.

                           (e)  Notwithstanding  paragraph 4(a), in the event of
any  voluntary  or  involuntary  liquidation,  dissolution  or winding up of the
affairs of the Corporation, the holders of Class A Preferred Stock shall receive
the greater of (i) the amount  payable  under  paragraph  4(a) above or (ii) the
amount which would be the  liquidation  payment per share of Common Stock if the
Class A Preferred Stock were effectively redeemed for Common Stock prior to such
liquidation,  for which purpose the Class A Preferred  Stock shall be treated as
representing an equal number of shares of Common Stock.

                  5. Redemption.

                           (a)   Optional   Redemption.   Prior  to  the   first
anniversary  of the  date of  issuance  of the  Class  A  Preferred


                                       17


<PAGE>

Stock, the Corporation shall not redeem the Class A Preferred Stock.  Subject to
the preceding  sentence and the  requirements of paragraph 5(b), the Corporation
may, at its option,  redeem the Class A Preferred Stock, at any time in whole at
the Deemed Value,  together with accrued and unpaid Dividends,  if any, thereon.
If the  Corporation  has  completed a Public  Offering (as defined  below) or an
Acquisition  more than 35 days prior to the Mandatory  Redemption Date, then the
Corporation may, at its option,  redeem the Class A Preferred Stock, in whole at
the Deemed Value,  together with accrued and unpaid Dividends,  if any, thereon,
subject to the following conditions: (i) the redemption shall be declared on the
closing date of such Public  Offering or  Acquisition,  (ii) the redemption date
shall be fixed no later than 35 days after such closing date, (iii) for purposes
of determining  the Deemed Value in the case of a Public  Offering,  the Closing
Price  shall equal the price per share at which  Common  Stock is issued in such
Public  Offering  and (iv) for purposes of  determining  the Deemed Value in the
case of an Acquisition,  the Closing Price shall be determined as of the closing
date  of such  Acquisition.  "Public  Offering"  as used  herein  shall  mean an
underwritten  public  offering  of  Common  Stock  with net  proceeds  resulting
therefrom in excess of $12,000,000.  "Acquisition"  as used herein shall mean an
acquisition by the  Corporation  of property of or securities  issued by a third
party in which the consideration paid by the Corporation (i) consists,  in whole
or in part,  of  shares of Common  Stock  and (ii) the  aggregate  value of such
shares of Common Stock exceeds  $12,000,000;  provided that such aggregate value
shall equal the number of such shares of Common Stock  multiplied by the Closing
Price as of the closing date of such Acquisition.

                           (b) Mandatory  Redemption.  On the fourth anniversary
of the  date  of  issuance  of the  Class  A  Preferred  Stock  (the  "Mandatory
Redemption Date"), so long as any shares of the Class A Preferred Stock shall be
outstanding,  the Corporation  shall redeem any issued and  outstanding  Class A
Preferred Stock at the Deemed Value, together with accrued and unpaid Dividends,
if any, thereon, payable in cash (to the extent the Corporation shall have funds
legally  available for such  payment) or Common Stock.  The price of such Common
Stock  shall be its  Closing  Price.  To the extent  that funds are not  legally
available  on the  Mandatory  Redemption  Date for the  payment  in cash for the
mandatory redemption of the Class A Preferred Stock and the Corporation does not
issue Common Stock as payment for such mandatory  redemption,  the provisions of
paragraph 7 shall apply.

                           (c) Acquired Shares.  Shares of the Class A Preferred
Stock which have been issued and  reacquired  in any  manner,  including  shares
purchased or redeemed,  shall (upon compliance with any applicable provisions of
the laws of the State of Delaware)  have the status of  authorized  and unissued
shares  of  Preferred  Stock  undesignated  as to  class  or  series  and may be
redesignated and reissued as part of any class or series of the Preferred Stock;
provided,  however,  that no such  issued and  reacquired  shares of the Class A
Preferred Stock shall be reissued or sold as Class A Preferred Stock.

                  6. Procedure for Redemption.

                           (a)  Manner of Notice.  In the event the  Corporation
shall redeem shares of the Class A Preferred  Stock,  notice of such  redemption
shall be given by first class  mail,  postage


                                       18


<PAGE>

prepaid,  mailed  not  less  than 30 days  nor  more  than 60 days  prior to the
redemption  date,  to each holder of record of the shares to be redeemed at such
holder's  address as the same appears on the stock register of the  Corporation.
Each such notice shall state (i) the redemption  date; (ii) the aggregate number
of shares of the Class A Preferred  Stock to be redeemed;  (iii) the  redemption
payment and to what extent such  redemption  payment will be paid in cash and/or
Common Stock; (iv) the place or places where certificates for such shares are to
be surrendered for the redemption payment;  and (v) that Dividends on the shares
to be redeemed will cease to accrue on such redemption date.

                           (b) Effect of Notice; Redemption.  Notice having been
mailed as aforesaid, from and after the redemption date (unless default shall be
made by the  Corporation in providing money for the payment of the redemption of
the shares so called  for  redemption),  Dividends  on the shares of the Class A
Preferred Stock so called for redemption shall cease to accrue,  and said shares
shall no  longer  be deemed to be  outstanding,  and all  rights of the  holders
thereof as stockholders of the Corporation (except the right to receive from the
Corporation  the redemption  payment) shall cease.  Upon surrender in accordance
with said  notice of the  certificates  for any  shares  so  redeemed  (properly
endorsed or assigned for transfer,  if the Board shall so require and the notice
shall so state),  such shares shall be redeemed by the Corporation at the Deemed
Value plus accrued and unpaid Dividends.

                  7. Conversion to Notes.

                           (a)  To  the  extent   that  funds  are  not  legally
available  on the  Mandatory  Redemption  Date for the  payment  in cash for the
mandatory  redemption of the Class A Preferred  Stock,  and the Corporation does
not issue Common  Stock as payment for such  mandatory  redemption,  as required
herein,  each outstanding  share of Class A Preferred Stock shall  automatically
convert (the "Conversion")  into a subordinated note (the  "Subordinated  Note")
given  by  the  Corporation  for  the  benefit  of  the  holder  thereof.   Each
Subordinated  Note shall be in a principal amount equal to the Deemed Value plus
accrued and unpaid Dividends.  The Subordinated Notes (i) shall bear interest at
a rate of six percent  (6%) per annum,  (ii) shall mature at the end of one year
from the date of  Conversion,  and (iii)  upon  maturity,  shall  become due and
payable as to any outstanding principal and interest.

                           (b) At the time of the Conversion, the holders of the
Subordinated Notes shall have the right,  voting separately as a class, to elect
one director of the  Corporation.  Upon the vesting of such right of the holders
of the Subordinated Notes, the maximum authorized number of members of the Board
shall  automatically be increased by one and the one vacancy so created shall be
filled  by vote of the  holders  of the  Subordinated  Notes.  The  right of the
holders of the  Subordinated  Notes to elect a member of the Board as  aforesaid
shall continue until such time as the Subordinated Notes have been paid in full,
at which time such right shall  terminate,  except as herein or by law expressly
provided. Upon termination of such special voting rights attributable to holders
of the Subordinated Notes pursuant to this paragraph,  the term of office of any
director  elected by the holders of  Subordinated  Notes (any such  director,  a
"Subordinated  Notes  Director") 


                                       19


<PAGE>

pursuant to such special  voting  rights  shall  immediately  terminate  and the
number of directors  constituting  the entire Board shall be reduced by one. Any
Subordinated  Notes  Director  may be  removed  by,  and  shall  not be  removed
otherwise than by, a majority vote of the outstanding Subordinated Notes. If the
office of any  Subordinated  Notes  Director  becomes vacant by reason of death,
resignation, retirement, disqualification,  removal from office, or otherwise, a
successor who shall hold office for the unexpired  term in respect of which such
vacancy occurred shall be elected by a majority of the outstanding  Subordinated
Notes, voting separately as a class.

                           (b) The indebtedness  represented by the Subordinated
Notes and the payment of the  principal  of and any  interest on each and all of
the  Subordinated  Notes shall be subordinate and subject in right of payment to
the prior payment in full of all Senior Indebtedness (as defined below). "Senior
Indebtedness"  as used herein shall mean the  principal of and premium,  if any,
and interest on (a) all  indebtedness  of the  Corporation  for money  borrowed,
other  than  Preferred  Stock,  whether  outstanding  as of the date  hereof  or
thereafter created,  incurred or assumed,  except indebtedness that by the terms
of the  instrument  or  instruments  by which such  indebtedness  was created or
incurred  expressly  provides  that it (i) is junior in right of  payment to the
Subordinated  Notes or (ii) ranks pari passu with the  Subordinated  Notes,  (b)
amendments, renewals, extensions, modifications,  refinancings and refundings of
any such  indebtedness  and (c) all of the  Corporation's  trade  payables.  For
purposes of the preceding sentence,  "indebtedness for money borrowed" when used
with respect to the Corporation  means:  (a) all indebtedness of the Corporation
for  money  borrowed   (including  any  indebtedness   secured  by  a  mortgage,
conditional  sales  contract  or other  lien which is (i) given to secure all or
part of the purchase  price of property  subject  thereto,  whether given to the
vendor of such  property or to another or (ii)  existing on property at the time
of acquisition  thereof);  (b) all indebtedness of the Corporation  evidenced by
notes, debentures,  bonds or other securities;  (c) all lease obligations of the
Corporation  which are capitalized on the books of the Corporation in accordance
with generally accepted accounting principles; (d) all indebtedness of others of
the kinds described in the preceding  clause (c) assumed by or guaranteed in any
manner by the Corporation or in effect guaranteed by the Corporation  through an
agreement to purchase, contingent or otherwise; and (e) all renewals, extensions
or refundings  of  indebtedness  of the kinds  described in any of the preceding
clauses (a), (b) or (d) and all renewals or extensions of lease  obligations  of
the kinds described in either of the preceding clauses (c) or (d).

                  8. Voting Rights. The holders of record of shares of the Class
A Preferred  Stock shall not be entitled to any voting rights except as provided
by law or otherwise specifically provided herein.

   
                  9.  Consent.  No consent  of holders of the Class A  Preferred
Stock shall be required for (a) the creation of any  indebtedness of any kind of
the  Corporation,  (b) the  creation  of any  class of stock of the  Corporation
ranking  junior as to dividends  and upon  liquidation  to the Class A Preferred
Stock, or (c) any increase or decrease in the amount of authorized Common Stock.
The  holders of record of shares of the Class A  Preferred  Stock shall have the
right, voting as a class, to vote on (i) any change in the rights, privileges or
preferenes of the Class A Preferred Stock,  provided that a favorable vote of at
least  two-thirds of the number of  outstanding  shares of the Class A Preferred
Stock is required to authorize such change,  (ii) the creation of any additional
class of preferred stock senior to the Class A Preferred Stock, provided that an
affirmative vote of at least two-thirds of the outstanding shares of the Class A
Preferred Stock is required for the creation of such senior class, and (iii) the
creation of any additional  class of preferred  stock equal in preference to the
Class A  Preferred  Stock,  provided  that  an  affirmative  vote of at  least a
majority of the  outstanding  shares of the Class A Preferred  Stock is required
for the creation of such equal class.

    


                                       20

<PAGE>

                  10.  Amendments.  The Board  reserves the right by  subsequent
amendment of this Certificate from time to time to decrease the number of shares
which constitute the Class A Preferred Stock (but not below the number of shares
thereof then  outstanding and required for the payment of Dividends  pursuant to
paragraph 2).


                                       21


<PAGE>



   
         IN WITNESS WHEREOF,  said Corporation has caused this Certificate to be
signed by Thomas  Nicolette,  its President and attested by Peter J. Mundy,  its
Secretary, this ___ day of ___________, 1997.
    



                                        SENTRY TECHNOLOGY CORPORATION



                                        By: __________________________________
                                               Thomas A. Nicolette



Attest:



____________________________
Peter J. Mundy


                                       22


<PAGE>

                                                                      APPENDIX G


<PAGE>




                          SENTRY TECHNOLOGY CORPORATION

                                     BY-LAWS

   
                             (As of January 14, 1997)

    

<PAGE>



                             STOCKHOLDERS' MEETINGS







         1. Time and Place of Meetings. All meetings of the stockholders for the
election of  Directors  or for any other  purpose  will be held at such time and
place,  within or without the State of  Delaware,  as may be  designated  by the
Board or, in the  absence of a  designation  by the  Board,  the  Chairman,  the
President, or the Secretary,  and stated in the notice of meeting. The Board may
postpone and reschedule any previously  scheduled  annual or special  meeting of
the stockholders.

         2. Annual Meeting.  An annual meeting of the stockholders  will be held
at such date and time as may be  designated  from time to time by the Board,  at
which meeting the  stockholders  will elect by a plurality vote the Directors to
succeed  those whose terms expire at such meeting and will  transact  such other
business as may properly be brought before the meeting in accordance with By-Law
8.

         3. Special Meetings. Special meetings of the stockholders may be called
only by (a) the  Chairman or (b) the  Secretary  within 10  calendar  days after
receipt  of the  written  request  of a majority  of the Whole  Board.  Any such
request by a majority  of the Whole Board must be sent to the  Chairman  and the
Secretary  and must  state the  purpose or  purposes  of the  proposed  meeting.
Special  meetings of holders of the outstanding  Preferred Stock, if any, may be
called in the manner and for the purposes  provided in the applicable  Preferred
Stock Designation. At a special meeting of stockholders,  only such business may
be  conducted  or  considered  as (i) has been  specified  in the  notice of the
meeting (or any supplement thereto) given by or at the direction of the Chairman
or a majority of the Whole Board or (ii)  otherwise is properly  brought  before
the meeting by the  presiding  officer of the meeting (as described in By-Law 8)
or by or at the direction of a majority of the Whole Board.

         4.  Notice  of  Meetings.  Written  notice  of  every  meeting  of  the
stockholders,  stating the place, date, and hour of the meeting and, in the case
of a special  meeting,  the purpose or purposes for which the meeting is called,
will be given not less than 10 nor more than 60 calendar days before the date of
the meeting to each  stockholder  of record  entitled  to vote at such  meeting,
except as otherwise  provided  herein or by law.  When a meeting is adjourned to
another place,  date, or time, written notice need not be given of the adjourned
meeting if the place,  date,  and time  thereof are  announced at the meeting at
which the adjournment is taken;  provided,  however,  that if the adjournment is
for more than 30 calendar days, or if after the adjournment

                                        1

<PAGE>



a new record  date is fixed for the  adjourned  meeting,  written  notice of the
place,  date,  and time of the  adjourned  meeting  must be given in  conformity
herewith.  At any  adjourned  meeting,  any  business  may be  transacted  which
properly could have been transacted at the original meeting.

         5. Inspectors. The Board may appoint one or more inspectors of election
to act as judges of the voting and to  determine  those  entitled to vote at any
meeting of the  stockholders,  or any  adjournment  thereof,  in advance of such
meeting.  The Board may designate one or more persons as alternate inspectors to
replace any  inspector who fails to act. If no inspector or alternate is able to
act at a meeting of  stockholders,  the  presiding  officer of the  meeting  may
appoint one or more substitute inspectors.

         6. Quorum.  Except as otherwise provided by law or in a Preferred Stock
Designation,  the holders of a majority of the stock issued and  outstanding and
entitled  to vote  thereat,  present  in person or  represented  by proxy,  will
constitute a quorum at all meetings of the  stockholders  for the transaction of
business thereat. If, however,  such quorum is not present or represented at any
meeting of the stockholders,  the stockholders entitled to vote thereat, present
in person or  represented  by proxy,  will have the power to adjourn the meeting
from time to time, without notice other than announcement at the meeting,  until
a quorum is present or represented.

         7. Voting.  Except as otherwise  provided by law, by the Certificate of
Incorporation,  or in a Preferred Stock  Designation,  each  stockholder will be
entitled  at every  meeting  of the  stockholders  to one vote for each share of
stock having voting power standing in the name of such  stockholder on the books
of the  Company on the record  date for the  meeting  and such votes may be cast
either in person or by written  proxy.  Every  proxy must be duly  executed  and
filed  with the  Secretary.  A  stockholder  may  revoke  any proxy  that is not
irrevocable  by  attending  the  meeting  and  voting  in person or by filing an
instrument in writing  revoking the proxy or another duly executed proxy bearing
a later date with the  Secretary.  The vote upon any question  brought  before a
meeting of the stockholders may be by voice vote,  unless otherwise  required by
the Certificate of  Incorporation or these By-Laws or unless the Chairman or the
holders of a majority of the outstanding shares of all classes of stock entitled
to vote  thereon  present  in  person  or by  proxy  at such  meeting  otherwise
determine.  Every vote taken by written ballot will be counted by the inspectors
of election.  When a quorum is present at any meeting,  the affirmative  vote of
the holders of a majority of the stock present in person or represented by proxy
at the meeting and entitled to vote on the subject matter and which has actually
been  voted  will be the act of the  stockholders,  except  in the  election  of
Directors  or as  otherwise  provided  in  these  By-Laws,  the  Certificate  of
Incorporation, a Preferred Stock Designation, or by law.














                                        2

<PAGE>



         8. Order of Business.  (a) The Chairman,  or any officer of the Company
designated  by a  majority  of  the  Whole  Board,  will  call  meetings  of the
stockholders  to  order  and  will  act as  presiding  officer  thereof.  Unless
otherwise determined by the Board prior to the meeting, the presiding officer of
the meeting of the  stockholders  will also  determine the order of business and
have the authority in his or her sole  discretion to regulate the conduct of any
such  meeting,  including  without  limitation by imposing  restrictions  on the
persons (other than stockholders of the Company or their duly appointed proxies)
who may attend any such  stockholders'  meeting,  by  ascertaining  whether  any
stockholder  or his proxy may be excluded  from any meeting of the  stockholders
based  upon  any  determination  by the  presiding  officer,  in his or her sole
discretion,  that any such person has unduly  disrupted  or is likely to disrupt
the  proceedings  thereat,  and by determining  the  circumstances  in which any
person may make a statement or ask questions at any meeting of the stockholders.

         (b) At an annual meeting of the  stockholders,  only such business will
be conducted or  considered  as is properly  brought  before the meeting.  To be
properly brought before an annual meeting, business must be (i) specified in the
notice of meeting (or any  supplement  thereto)  given by or at the direction of
the Board,  (ii) otherwise  properly brought before the meeting by the presiding
officer or by or at the  direction  of a majority of the Whole  Board,  or (iii)
otherwise  properly  requested to be brought before the meeting by a stockholder
of the Company in accordance with paragraph (c) of this By-Law 8.



         (c) For  business  to be  properly  requested  to be brought  before an
annual meeting by a stockholder,  the  stockholder  must (i) be a stockholder of
the  Company of record at the time of the  giving of the notice for such  annual
meeting provided for in these By-Laws, (ii) be entitled to vote at such meeting,
and (iii) have given timely notice  thereof in writing to the  Secretary.  To be
timely,  a  stockholder's  notice must be delivered to or mailed and received at
the  principal  executive  offices of the Company not less than 60 calendar days
prior  to the  annual  meeting;  provided,  however,  that in the  event  public
announcement  of the date of the annual meeting is not made at least 75 calendar
days prior to the date of the annual  meeting,  notice by the  stockholder to be
timely  must be so  received  not later than the close of  business  on the 10th
calendar day following the day on which public announcement is first made of the
date of the annual  meeting.  A  stockholder's  notice to the Secretary must set
forth as to each  matter the  stockholder  proposes  to bring  before the annual
meeting (A) a  description  in reasonable  detail of the business  desired to be
brought before the annual  meeting and the reasons for conducting  such business
at the annual meeting, (B) the name and address, as they appear on the Company's
books, of the stockholder  proposing such business and the beneficial  owner, if
any, on whose behalf the proposal is made, (C) the class and number of shares of
the  Company  that are  owned  beneficially  and of  record  by the  stockholder
proposing such business and by the beneficial owner, if any, on whose behalf the
proposal is made, and (D) any material  interest of such  stockholder  proposing
such business and the beneficial  owner, if any, on whose behalf the proposal is
made  in  such  business.  Notwithstanding  anything  in  these  By-Laws  to the
contrary,  no  business  will  be  conducted  at an  annual  meeting  except  in
accordance with the procedures set













                                        3

<PAGE>



forth in this By-Law 8. The presiding officer of the annual meeting will, if the
facts  warrant,  determine  that  business was not properly  brought  before the
meeting in accordance with the procedures prescribed in this By-Law 8 and, if he
or she should so  determine,  he or she will so declare to the  meeting  and any
such business not properly  brought  before the meeting will not be  transacted.
Notwithstanding  the foregoing  provisions of this By-Law 8, a stockholder  must
also comply with all applicable  requirements of the Securities  Exchange Act of
1934, as amended,  and the rules and regulations  thereunder with respect to the
matters set forth in this  By-Law 8. For  purposes of this By-Law and By-Law 13,
"public  announcement"  means  disclosure in a press release reported by the Dow
Jones News Service,  Associated Press, or comparable national news service or in
a document  publicly  filed by the  Company  with the  Securities  and  Exchange
Commission  pursuant to Sections 13, 14, or 15(d) of the Securities Exchange Act
of 1934,  as  amended.  Nothing  in this  By-Law 8 will be deemed to affect  any
rights of stockholders to request  inclusion of proposals in the Company's proxy
statement  pursuant to Rule 14a-8 under the Securities  Exchange Act of 1934, as
amended.



                                    DIRECTORS

         9.  Function.  The  business and affairs of the Company will be managed
under the direction of its Board.


         10. Number,  Election, and Terms. Subject to the rights, if any, of any
series of Preferred  Stock to elect  additional  Directors  under  circumstances
specified in a Preferred Stock  Designation,  the authorized number of Directors
may be  determined  from time to time only by a vote of a majority  of the Whole
Board or by the  affirmative  vote of the  holders of at least 80% of the Voting
Stock,  voting  together  as a single  class,  but in no case will the number of
Directors be other than as provided in the  Certificate  of  Incorporation.  The
Directors,  other than those who may be elected by the  holders of any series of
the Preferred Stock,  will be classified with respect to the time for which they
severally hold office in accordance with the Certificate of  Incorporation.  The
Chairman  shall be selected by a majority vote of the Board.  The Chairman shall
preside   over   meetings   of  the  Board  and  have  the  other   powers   and
responsibilities  in relation to the activities of the Board as are specified in
these Bylaws. The Chairman will not be an officer of the Company.


         11. Vacancies and Newly Created  Directorships.  Subject to the rights,
if any,  of the  holders of any series of  Preferred  Stock to elect  additional
Directors under circumstances


                                        4

<PAGE>



specified  in  a  Preferred  Stock  Designation,   newly  created  directorships
resulting  from any increase in the number of Directors and any vacancies on the
Board resulting from death,  resignation,  disqualification,  removal,  or other
cause  will be  filled  solely  by the  affirmative  vote of a  majority  of the
remaining Directors then in office, even though less than a quorum of the Board,
or by a sole remaining  Director.  Any Director  elected in accordance  with the
preceding  sentence  will hold office for the  remainder of the full term of the
class of  Directors  in which the new  directorship  was  created or the vacancy
occurred  and until such  Director's  successor  is elected  and  qualified.  No
decrease in the number of Directors constituting the Board will shorten the term
of an incumbent Director.

         12.  Removal.  Subject to the  rights,  if any,  of the  holders of any
series of Preferred  Stock to elect  additional  Directors  under  circumstances
specified  in a Preferred  Stock  Designation,  any Director may be removed from
office by the stockholders only for cause and only in the manner provided in the
Certificate of Incorporation and, if applicable, any amendment to these By-Laws.

         13. Nominations of Directors;  Election.  (a) Subject to the rights, if
any,  of the  holders  of any  series  of  Preferred  Stock to elect  additional
Directors under circumstances  specified in a Preferred Stock Designation,  only
persons who are nominated in accordance  with the following  procedures  will be
eligible for election as Directors of the Company.

         (b) Nominations of persons for election as Directors of the Company may
be made at a meeting of stockholders  (i) by or at the direction of the Board or
(ii) by any  stockholder who is a stockholder of record at the time of giving of
notice  provided  for in this By-Law 13 who is entitled to vote for the election
of Directors at the meeting and who complies  with the  procedures  set forth in
this By-Law 13. All nominations by stockholders  must be made pursuant to timely
notice in proper written form to the Secretary.

         (c) To be timely, a stockholder's notice must be delivered to or mailed
and received at the principal  executive offices of the Company not less than 60
calendar days prior to the meeting;  provided,  however,  that in the event that
public  announcement of the date of the meeting is not made at least 75 calendar
days prior to the date of the meeting,  notice by the  stockholder  to be timely
must be so received  not later than the close of  business on the 10th  calendar
day following the day on which public  announcement is first made of the date of
the meeting.  To be in proper written form, such  stockholder's  notice must set
forth or  include  (i) the name and  address,  as they  appear on the  Company's
books, of the stockholder giving the notice and of the beneficial owner, if any,
on  whose  behalf  the  nomination  is  made;  (ii) a  representation  that  the
stockholder giving the notice is a holder of record of stock of the











                                        5

<PAGE>



Company  entitled to vote at such  meeting and intends to appear in person or by
proxy at the meeting to nominate the person or persons  specified in the notice;
(iii) the class and number of shares of stock of the Company owned  beneficially
and of record by the stockholder  giving the notice and by the beneficial owner,
if any,  on whose  behalf the  nomination  is made;  (iv) a  description  of all
arrangements  or  understandings  between  or among  any of (A) the  stockholder
giving the notice, (B) the beneficial owner on whose behalf the notice is given,
(C) each  nominee,  and (D) any other  person or persons  (naming such person or
persons)  pursuant to which the nomination or nominations  are to be made by the
stockholder giving the notice; (v) such other information regarding each nominee
proposed  by the  stockholder  giving  the  notice  as would be  required  to be
included  in a  proxy  statement  filed  pursuant  to  the  proxy  rules  of the
Securities and Exchange  Commission had the nominee been nominated,  or intended
to be nominated,  by the Board;  and (vi) the signed  consent of each nominee to
serve as a director of the  Company if so elected.  At the request of the Board,
any person nominated by the Board for election as a Director must furnish to the
Secretary that information required to be set forth in a stockholder's notice of
nomination which pertains to the nominee.  The presiding  officer of the meeting
for  election  of  Directors  will,  if  the  facts  warrant,  determine  that a
nomination  was not made in accordance  with the  procedures  prescribed by this
By-Law 13, and if he or she  should so  determine,  he or she will so declare to
the meeting and the defective  nomination will be  disregarded.  Notwithstanding
the foregoing  provisions of this By-Law 13, a stockholder must also comply with
all applicable  requirements of the Securities Exchange Act of 1934, as amended,
and the rules and  regulations  thereunder with respect to the matters set forth
in this By-Law 13.

         14. Resignation.  Any Director may resign at any time by giving written
notice of his resignation to the Chairman or the Secretary. Any resignation will
be effective upon actual receipt by any such person or, if later, as of the date
and time specified in such written notice.

         15.  Regular  Meetings.  Regular  meetings  of the  Board  may be  held
immediately  after the annual meeting of the stockholders and at such other time
and place  either  within or without  the State of  Delaware as may from time to
time be  determined by the Board.  Notice of regular  meetings of the Board need
not be given.

         16. Special  Meetings.  Special  meetings of the Board may be called by
the Chairman or the  President on one day's notice to each Director by whom such
notice is not waived, given either personally or by mail,  telephone,  telegram,
telex, facsimile, or similar medium of communication,  and will be called by the
Chairman  or the  President  in like  manner and on like  notice on the  written
request of five or more Directors.  Special meetings of the Board may be held at
such time and  place  either  within or  without  the  State of  Delaware  as is
determined by the Board or specified in the notice of any such meeting.











                                        6

<PAGE>




         17.  Quorum.  At all  meetings  of the Board,  a majority  of the total
number of Directors then in office will  constitute a quorum for the transaction
of business.  Except for the  designation of committees as hereinafter  provided
and  except  for  actions  required  by  these  By-Laws  or the  Certificate  of
Incorporation  to be  taken  by a  majority  of the  Whole  Board,  the act of a
majority of the Directors present at any meeting at which there is a quorum will
be the act of the Board. If a quorum is not present at any meeting of the Board,
the  Directors  present  thereat may  adjourn  the meeting  from time to time to
another  place,  time, or date,  without notice other than  announcement  at the
meeting, until a quorum is present.

         18. Participation in Meetings by Telephone  Conference.  Members of the
Board or any committee  designated by the Board may  participate in a meeting of
the  Board or any such  committee,  as the  case may be,  by means of  telephone
conference  or similar means by which all persons  participating  in the meeting
can hear  each  other,  and such  participation  in a  meeting  will  constitute
presence in person at the meeting.


         19.  Committees.  (a) The Board, by resolution  passed by a majority of
the  Whole  Board,   may  designate  an  executive   committee  (the  "Executive
Committee"). The Executive Committee, if one is so designated, will have and may
exercise  the powers of the Board,  except  the power to declare  dividends,  to
amend these By-Laws, to elect officers, or to rescind or modify any prior action
of the Board and except as otherwise provided by law.


         (b) The Board,  by resolution  passed by a majority of the Whole Board,
may designate one or more additional committees,  each such committee to consist
of one or more  Directors  and each to have such lawfully  delegable  powers and
duties as the Board may confer.

         (c) The Executive  Committee and each other committee of the Board will
serve at the pleasure of the Board or as may be specified in any resolution from
time to time adopted by the Board. The Board may designate one or more Directors
as  alternate  members  of any such  committee,  who may  replace  any absent or
disqualified member at any meeting of such committee.  In lieu of such action by
the  Board,  in the  absence  or upon the  disqualification  of any  member of a
committee of the Board,  the members thereof present at any such meeting of such
committee and not  disqualified  from voting,  whether or not they  constitute a
quorum,  may  unanimously  appoint  another  member  of the  Board to act at the
meeting in the place of any such absent or disqualified member.



                                        7

<PAGE>



         (d)  Except as  otherwise  provided  in these  By-Laws  or by law,  any
committee of the Board,  to the extent  provided in Paragraph (a) of this By-Law
or, if applicable,  in the  resolution of the Board,  will have and may exercise
all the powers and authority of the Board in the direction of the  management of
the business and affairs of the Company.  Any such  committee  designated by the
Board will have such name as may be  determined  from time to time by resolution
adopted by the Board.  Unless  otherwise  prescribed by the Board, a majority of
the  members  of any  committee  of the Board will  constitute  a quorum for the
transaction of business,  and the act of a majority of the members  present at a
meeting  at  which  there is a quorum  will be the act of such  committee.  Each
committee  of the Board may  prescribe  its own rules for  calling  and  holding
meetings and its method of  procedure,  subject to any rules  prescribed  by the
Board, and will keep a written record of all actions taken by it.

         20.  Compensation.  The Board may establish the  compensation  for, and
reimbursement  of the expenses of,  Directors for membership on the Board and on
committees  of the Board,  attendance  at meetings of the Board or committees of
the Board,  and for other  services  by  Directors  to the Company or any of its
majority-owned subsidiaries.

         21. Rules. The Board may adopt rules and regulations for the conduct of
their meetings and the management of the affairs of the Company.


                                     NOTICES

         22. Generally.  Except as otherwise provided by law, these By-Laws,  or
the Certificate of Incorporation, whenever by law or under the provisions of the
Certificate of  Incorporation or these By-Laws notice is required to be given to
any  Director  or  stockholder,  it will not be  construed  to require  personal
notice,  but such notice may be given in  writing,  by mail,  addressed  to such
Director or  stockholder,  at the address of such Director or  stockholder as it
appears on the records of the Company,  with postage thereon  prepaid,  and such
notice will be deemed to be given at the time when the same is  deposited in the
United  States  mail.  Notice  to  Directors  may also be  given  by  telephone,
telegram,  telex,  facsimile, or similar medium of communication or as otherwise
may be permitted by these By-Laws.

         23.  Waivers.  Whenever  any notice is  required  to be given by law or
under the provisions






                                        8

<PAGE>



of the  Certificate  of  Incorporation  or these  By-Laws,  a waiver  thereof in
writing, signed by the person or persons entitled to such notice, whether before
or after the time of the event for which  notice is to be given,  will be deemed
equivalent to such notice. Attendance of a person at a meeting will constitute a
waiver of notice of such meeting,  except when the person  attends a meeting for
the express  purpose of  objecting,  at the  beginning  of the  meeting,  to the
transaction  of any  business  because  the  meeting is not  lawfully  called or
convened.


                                    OFFICERS


         24. Generally. The officers of the Company will be elected by the Board
and will consist of a  President,  a  Secretary,  and a Treasurer.  The Board of
Directors  may  also  choose  any  or all of the  following:  one or  more  Vice
Presidents (who may be given particular  designations with respect to authority,
function,  or seniority),  and such other officers as the Board may from time to
time determine.  Notwithstanding the foregoing, by specific action the Board may
authorize the Chairman to appoint any person to any office other than President,
Secretary,  or Treasurer.  Any number of offices may be held by the same person.
Any of the  offices  may be left  vacant  from  time to  time as the  Board  may
determine.  In the case of the  absence  or  disability  of any  officer  of the
Company or for any other reason  deemed  sufficient  by a majority of the Board,
the Board may delegate the absent or disabled  officer's powers or duties to any
other officer or to any Director.

         25.  Compensation.  The  compensation of all officers and agents of the
Company who are also Directors of the Company will be fixed by the Board or by a
committee  of the Board.  The Board may fix, or delegate  the power to fix,  the
compensation  of other  officers  and agents of the Company to an officer of the
Company.

         26.  Succession.  The  officers of the Company  will hold office at the
pleasure  of the Board of  Directors.  Any officer may be removed at any time by
the affirmative vote of a majority of the Whole Board. Any vacancy  occurring in
any office of the Company may be filled by the Board.

         27. Authority and Duties. Each of the officers of the Company will have
such authority and will perform such duties as are customarily incident to their
respective offices or as may be



                                        9

<PAGE>



specified from time to time by the Board.


                                      STOCK

         28.  Certificates.  Certificates  representing  shares  of stock of the
Company  will  be in  such  form  as is  determined  by the  Board,  subject  to
applicable  legal  requirements.  Each such certificate will be numbered and its
issuance recorded in the books of the Company, and such certificate will exhibit
the holder's name and the number of shares and will be signed by, or in the name
of, the Company by the President and the Secretary or an Assistant Secretary, or
the Treasurer or an Assistant Treasurer, and will also be signed by, or bear the
facsimile  signature  of, a duly  authorized  officer  or agent of any  properly
designated  transfer agent of the Company.  Any or all of the signatures and the
seal of the Company, if any, upon such certificates may be facsimiles, engraved,
or printed.  Such certificates may be issued and delivered  notwithstanding that
the person whose facsimile  signature appears thereon may have ceased to be such
officer at the time the certificates are issued and delivered.

         29.  Classes of Stock.  The  designations,  preferences,  and  relative
participating, optional, or other special rights of the various classes of stock
or series thereof, and the qualifications, limitations, or restrictions thereof,
will be set forth in full or summarized on the face or back of the  certificates
which the  Company  issues to  represent  its stock,  or in lieu  thereof,  such
certificates  will set forth the office of the Company from which the holders of
certificates may obtain a copy of such information.

         30.  Transfers.  Upon surrender to the Company or the transfer agent of
the Company of a certificate  for shares duly endorsed or  accompanied by proper
evidence of  succession,  assignment,  or authority to transfer,  it will be the
duty of the Company to issue,  or to cause its  transfer  agent to issue,  a new
certificate to the person  entitled  thereto,  cancel the old  certificate,  and
record the transaction upon its books.

         31. Lost, Stolen, or Destroyed Certificates. The Secretary may direct a
new  certificate  or  certificates  to be issued in place of any  certificate or
certificates  theretofore  issued by the  Company  alleged  to have  been  lost,
stolen, or destroyed, upon the making of an affidavit of that fact, satisfactory
to the Secretary,  by the person  claiming the  certificate of stock to be lost,
stolen,











                                       10

<PAGE>



or destroyed.  As a condition  precedent to the issuance of a new certificate or
certificates,  the  Secretary  may require the owners of such lost,  stolen,  or
destroyed certificate or certificates to give the Company a bond in such sum and
with such surety or sureties as the  Secretary  may direct as indemnity  against
any claims that may be made against the Company with respect to the  certificate
alleged to have been lost,  stolen,  or  destroyed  or the  issuance  of the new
certificate.

         32.  Record  Dates.  (a) In order that the  Company may  determine  the
stockholders  entitled to notice of or to vote at any meeting of stockholders or
any adjournment thereof, the Board may fix a record date, which will not be more
than 60 nor less than 10 calendar  days before the date of such  meeting.  If no
record date is fixed by the Board, the record date for determining  stockholders
entitled  to notice of or to vote at a meeting  of  stockholders  will be at the
close of business on the calendar day next  preceding the day on which notice is
given,  or, if notice is waived,  at the close of business on the  calendar  day
next  preceding  the day on which  the  meeting  is  held.  A  determination  of
stockholders  of record  entitled  to  notice of or to vote at a meeting  of the
stockholders  will apply to any adjournment of the meeting;  provided,  however,
that the Board may fix a new record date for the adjourned meeting.

         (b) In order that the Company may determine the  stockholders  entitled
to receive  payment of any  dividend or other  distribution  or allotment of any
rights or the  stockholders  entitled to  exercise  any rights in respect of any
change, conversion, or exchange of stock, or for the purpose of any other lawful
action, the Board may fix a record date, which record date will not be more than
60 calendar  days prior to such action.  If no record date is fixed,  the record
date for determining  stockholders  for any such purpose will be at the close of
business on the calendar day on which the Board adopts the  resolution  relating
thereto.

         (c) The Company  will be entitled to treat the person in whose name any
share of its stock is registered as the owner thereof for all purposes, and will
not be bound to recognize  any equitable or other claim to, or interest in, such
share on the part of any other  person,  whether or not the  Company  has notice
thereof, except as expressly provided by applicable law.












                                       11

<PAGE>



                                 INDEMNIFICATION

         33. Damages and Expenses. (a) Without limiting the generality or effect
of Article Ninth of the Certificate of  Incorporation,  the Company shall to the
fullest  extent  permitted by  applicable  law as then in effect  indemnify  any
person (an "Indemnitee") who is or was involved in any manner (including without
limitation  as a party or a witness) or is  threatened to be made so involved in
any threatened,  pending, or completed  investigation,  claim,  action, suit, or
proceeding, whether civil, criminal, administrative, or investigative (including
without  limitation  any action,  suit,  or proceeding by or in the right of the
Company to procure a judgment  in its favor) (a  "Proceeding")  by reason of the
fact that such  person is or was or had  agreed to become a  Director,  officer,
employee,  or agent of the  Company,  or is or was serving at the request of the
Board or an officer of the Company as a director, officer, employee, or agent of
another corporation, partnership, joint venture, trust, or other entity, whether
for profit or not for profit (including the heirs, executors, administrators, or
estate  of such  person),  or  anything  done or not by such  person in any such
capacity,  against all expenses (including attorneys' fees),  judgments,  fines,
and amounts paid in settlement  actually and reasonably  incurred by such person
in connection  with such  Proceeding.  Such  indemnification  will be a contract
right and will  include the right to receive  payment in advance of any expenses
incurred by an Indemnitee in connection  with such  Proceeding,  consistent with
the provisions of applicable law as then in effect.


         (b) The right of indemnification provided in this By-Law 33 will not be
exclusive of any other rights to which any person  seeking  indemnification  may
otherwise  be  entitled,  and will be  applicable  to  Proceedings  commenced or
continuing  after the adoption of this By-Law 33,  whether  arising from acts or
omissions occurring before or after such adoption.

         (c) In furtherance,  but not in limitation of the foregoing provisions,
the following procedures,  presumptions, and remedies will apply with respect to
advancement of expenses and the right to indemnification under this By-Law 33:

                  (i) All  reasonable  expenses  incurred  by or on behalf of an
         Indemnitee in connection  with any  Proceeding  will be advanced to the
         Indemnitee by the Company  within 30 calendar days after the receipt by
         the Company of a statement or statements from the Indemnitee requesting
         such advance or advances  from time to time,  whether prior to or after
         final disposition of such Proceeding. Such statement or statements will
         reasonably evidence the expenses incurred by the Indemnitee and, if and
         to the extent required by law at the time of such advance, will include
         or be  accompanied  by an undertaking by or on behalf of the Indemnitee
         to repay such amounts advanced as to











                                       12

<PAGE>



         which  it may  ultimately  be  determined  that the  Indemnitee  is not
         entitled.  If such an  undertaking is required by law at the time of an
         advance,  no security  will be required for such  undertaking  and such
         undertaking  will be  accepted  without  reference  to the  recipient's
         financial ability to make repayment.


                  (ii) To obtain  indemnification  under  this  By-Law  33,  the
         Indemnitee  will submit to the Secretary a written  request,  including
         such documentation  supporting the claim as is reasonably  available to
         the Indemnitee and is reasonably  necessary to determine whether and to
         what  extent  the  Indemnitee  is  entitled  to  indemnification   (the
         "Supporting  Documentation").  The  determination  of the  Indemnitee's
         entitlement to  indemnification  will be made not less than 60 calendar
         days  after  receipt  by  the  Company  of  the  written   request  for
         indemnification  together  with  the  Supporting   Documentation.   The
         Secretary   will   promptly   upon   receipt  of  such  a  request  for
         indemnification  advise the Board in writing  that the  Indemnitee  has
         requested    indemnification.    The   Indemnitee's    entitlement   to
         indemnification  under this By-Law 33 will be  determined in one of the
         following ways: (A) by a majority vote of the  Disinterested  Directors
         (as hereinafter defined), if they constitute a quorum of the Board, or,
         in the case of an Indemnitee that is not a present or former officer of
         the Company,  by any committee of the Board or committee of officers or
         agents of the Company  designated for such purpose by a majority of the
         Whole Board;  (B) by a written opinion of Independent  Counsel if (1) a
         Change of Control has occurred and the Indemnitee so requests or (2) in
         the case of an  Indemnitee  that is a present or former  officer of the
         Company, a quorum of the Board consisting of Disinterested Directors is
         not obtainable or, even if obtainable, a majority of such Disinterested
         Directors so directs;  (C) by the stockholders  (but only if a majority
         of the  Disinterested  Directors,  if they  constitute  a quorum of the
         Board,  presents the issue of  entitlement  to  indemnification  to the
         stockholders   for  their   determination);   or  (D)  as  provided  in
         subparagraph (iii) below. In the event the determination of entitlement
         to  indemnification  is to be made by Independent  Counsel  pursuant to
         clause (B) above, a majority of the Disinterested Directors will select
         the Independent  Counsel,  but only an Independent Counsel to which the
         Indemnitee does not reasonably  object;  provided,  however,  that if a
         Change of  Control  has  occurred,  the  Indemnitee  will  select  such
         Independent Counsel, but only an Independent Counsel to which the Board
         does not reasonably object.


                  (iii)  Except as otherwise  expressly  provided in this By-Law
         33, the Indemnitee  will be presumed to be entitled to  indemnification
         under this By-Law 33 upon  submission of a request for  indemnification
         together  with  the  Supporting   Documentation   in  accordance   with
         subparagraph  (c) (ii) above,  and thereafter the Company will have the
         burden of proof to  overcome  that  presumption  in reaching a contrary
         determination.  In any event, if the person or persons  empowered under
         subparagraph (c) (ii) to determine  entitlement to indemnification  has
         not been appointed or has not made a  determination  within 60 calendar
         days after receipt by the Company of the request therefor together with



                                       13

<PAGE>



         the  Supporting  Documentation,  the  Indemnitee  will be  deemed to be
         entitled to indemnification and the Indemnitee will be entitled to such
         indemnification  unless (A) the Indemnitee  misrepresented or failed to
         disclose a material fact in making the request for  indemnification  or
         in  the  Supporting   Documentation  or  (B)  such  indemnification  is
         prohibited  by law.  The  termination  of any  Proceeding  described in
         paragraph  (a) of this  By-Law  33, or of any claim,  issue,  or matter
         therein, by judgment,  order, settlement, or conviction, or upon a plea
         of nolo  contendere or its equivalent,  will not, of itself,  adversely
         affect  the  right of the  Indemnitee  to  indemnification  or create a
         presumption  that the  Indemnitee  did not act in good  faith  and in a
         manner which the Indemnitee reasonably believed to be in or not opposed
         to the best  interests  of the Company or, with respect to any criminal
         Proceeding,  that the Indemnitee  had reasonable  cause to believe that
         his conduct was not unlawful.



                  (iv) (A) In the event that a determination is made pursuant to
         subparagraph   (c)  (ii)  that  the   Indemnitee  is  not  entitled  to
         indemnification  under  this  By-Law  33,  (1) the  Indemnitee  will be
         entitled  to seek an  adjudication  of his or her  entitlement  to such
         indemnification  either,  at the  Indemnitee's  sole option,  in (x) an
         appropriate  court  of the  State of  Delaware  or any  other  court of
         competent  jurisdiction  or (y) an  arbitration  to be  conducted  by a
         single  arbitrator  pursuant to the rules of the  American  Arbitration
         Association; (2) any such judicial proceeding or arbitration will be de
         novo  and the  Indemnitee  will not be  prejudiced  by  reason  of such
         adverse  determination;  and (3) in any  such  judicial  proceeding  or
         arbitration  the  Company  will  have the  burden of  proving  that the
         Indemnitee is not entitled to indemnification under this By-Law 33.


                  (B) If a  determination  is made or deemed to have been  made,
         pursuant  to  subparagraph  (c)(ii) or (iii) of this By-Law 33 that the
         Indemnitee  is  entitled  to  indemnification,   the  Company  will  be
         obligated to pay the amounts constituting such  indemnification  within
         five business days after such  determination has been made or deemed to
         have been  made and will be  conclusively  bound by such  determination
         unless  (1) the  Indemnitee  misrepresented  or  failed to  disclose  a
         material  fact in making  the  request  for  indemnification  or in the
         Supporting  Documentation or (2) such  indemnification is prohibited by
         law.  In the event that  advancement  of  expenses  is not timely  made
         pursuant  to  subparagraph  (c)(i)  of this  By-Law  33 or  payment  of
         indemnification   is  not  made  within  five  business  days  after  a
         determination of entitlement to indemnification has been made or deemed
         to have been made  pursuant  to  subparagraph  (c)(ii) or (iii) of this
         By-Law 33, the Indemnitee will be entitled to seek judicial enforcement
         of the Company's  obligation to pay to the Indemnitee such  advancement
         of expenses or  indemnification.  Notwithstanding  the  foregoing,  the
         Company may bring an action,  in an  appropriate  court in the State of
         Delaware or any other court of competent  jurisdiction,  contesting the
         right of the Indemnitee to receive indemnification hereunder due to the
         occurrence  of any  event  described  in  subclause  (1) or (2) of this
         clause (B) (a "Disqualifying  Event");  provided,  however, that in any
         such action the Company will have



                                       14

<PAGE>



         the burden of proving the occurrence of such Disqualifying Event.

                  (C)  The  Company  will be  precluded  from  asserting  in any
         judicial proceeding or arbitration commenced pursuant to the provisions
         of this  subparagraph  (c)(iv) that the procedures and  presumptions of
         this  By-Law  33 are not  valid,  binding,  and  enforceable  and  will
         stipulate  in any such  court or before  any such  arbitrator  that the
         Company is bound by all the provisions of this By-Law 33.

                  (D)  In  the  event  that  the  Indemnitee,  pursuant  to  the
         provisions of this subparagraph (c)(iv),  seeks a judicial adjudication
         of, or an award in  arbitration  to enforce,  his rights  under,  or to
         recover  damages for breach of, this By-Law 33, the Indemnitee  will be
         entitled to recover from the Company,  and will be  indemnified  by the
         Company against,  any expenses actually and reasonably  incurred by the
         Indemnitee if the Indemnitee prevails in such judicial  adjudication or
         arbitration.  If it is  determined  in such  judicial  adjudication  or
         arbitration that the Indemnitee is entitled to receive part but not all
         of the  indemnification or advancement of expenses sought, the expenses
         incurred  by  the   Indemnitee   in   connection   with  such  judicial
         adjudication or arbitration will be prorated accordingly.

         (v)  For purposes of this paragraph (c):


                  (A) "Change in  Control"  means the  occurrence  of any of the
following events:

                           (1)  The   Company   is  merged,   consolidated,   or
                  reorganized  into or with another  corporation  or other legal
                  entity,  and as a result  of such  merger,  consolidation,  or
                  reorganization  less than a majority  of the  combined  voting
                  power of the then  outstanding  securities of such corporation
                  or entity  immediately  after such transaction are held in the
                  aggregate by the holders of the Voting Stock immediately prior
                  to such transaction;

                           (2) The Company  sells or otherwise  transfers all or
                  substantially  all of its  assets to  another  corporation  or
                  other legal  entity and, as a result of such sale or transfer,
                  less than a majority of the combined voting power of the


                                       15

<PAGE>



                  then-outstanding  securities  of  such  other  corporation  or
                  entity  immediately after such sale or transfer is held in the
                  aggregate by the holders of Voting Stock  immediately prior to
                  such sale or transfer;

                           (3)  There  is a  report  filed  on  Schedule  13D or
                  Schedule 14D-1 (or any successor schedule,  form, or report or
                  item therein),  each as promulgated pursuant to the Securities
                  Exchange  Act  of  1934,  as  amended  (the  "Exchange  Act"),
                  disclosing  that any person (as the term  "person"  is used in
                  Section  13(d)(3) or Section 14(d)(2) of the Exchange Act) has
                  become the beneficial owner (as the term "beneficial owner" is
                  defined under Rule 13d-3 or any  successor  rule or regulation
                  promulgated under the Exchange Act) of securities representing
                  20% or more of the combined voting power of the Voting Stock;

                           (4) The  Company  files a report  or proxy  statement
                  with the  Securities and Exchange  Commission  pursuant to the
                  Exchange  Act  disclosing  in response to Form 8-K or Schedule
                  14A  (or any  successor  schedule,  form,  or  report  or item
                  therein)  that a change in control of the Company has occurred
                  or will  occur in the  future  pursuant  to any  then-existing
                  contract or transaction; or

                           (5) If, during any period of two  consecutive  years,
                  individuals who at the beginning of any such period constitute
                  the  Directors  cease for any reason to  constitute at least a
                  majority thereof; provided, however, that for purposes of this
                  clause  (5)  each  Director  who is  first  elected,  or first
                  nominated  for election by the  Company's  stockholders,  by a
                  vote of at least  two-thirds  of the Directors (or a committee
                  of the Board) then still in office who were  Directors  at the
                  beginning  of any such  period  will be  deemed to have been a
                  Director at the beginning of such period.


Notwithstanding the foregoing provisions of clauses (3) or (4) of this paragraph
(c)(v)(A),  unless  otherwise  determined in a specific case by majority vote of
the  Board,  a "Change  in  Control"  will not be deemed  to have  occurred  for
purposes of such  clauses  (3) or (4) solely  because  (x) the  Company,  (y) an
entity in which the Company,  directly or indirectly,  beneficially  owns 50% or
more of the  voting  securities  (a  "Subsidiary"),  or (z) any  employee  stock
ownership  plan  or any  other  employee  benefit  plan  of the  Company  or any
Subsidiary  either  files  or  becomes  obligated  to file a  report  or a proxy
statement  under or in response to Schedule 13D,  Schedule  14D-1,  Form 8-K, or
Schedule 14A (or any successor schedule,  form, or report or item therein) under
the  Exchange  Act  disclosing  beneficial  ownership  by it of shares of Voting
Stock, whether in












                                       16

<PAGE>


excess of 20% or  otherwise,  or because  the Company  reports  that a change in
control of the  Company  has  occurred  or will occur in the future by reason of
such beneficial ownership.

                  (B)  "Disinterested  Director" means a Director of the Company
         who is not or was not a party to the  Proceeding  in  respect  of which
         indemnification is sought by the Indemnitee.

                  (C)  "Independent  Counsel"  means a law firm or a member of a
         law firm that  neither  presently  is,  nor in the past five  years has
         been,  retained to represent  (1) the Company or the  Indemnitee in any
         matter  material  to either  such  party or (2) any other  party to the
         Proceeding giving rise to a claim for indemnification under this By-Law
         33. Notwithstanding the foregoing,  the term "Independent Counsel" will
         not  include  any  person  who,  under  the  applicable   standards  of
         professional  conduct  then  prevailing  under  the law of the State of
         Delaware,  would be precluded from  representing  either the Company or
         the Indemnitee in an action to determine the Indemnitee's  rights under
         this By-Law 33.


         (d) If any  provision  or  provisions  of this By-Law 33 are held to be
invalid, illegal, or unenforceable for any reason whatsoever:  (i) the validity,
legality,  and  enforceability  of the  remaining  provisions  of this By-Law 33
(including  without  limitation  all portions of any paragraph of this By-Law 33
containing  any such provision held to be invalid,  illegal,  or  unenforceable,
that are not themselves invalid,  illegal, or unenforceable) will not in any way
be affected or impaired  thereby and (ii) to the fullest  extent  possible,  the
provisions of this By-Law 33 (including  without  limitation all portions of any
paragraph of this By-Law 33 containing  any such  provision  held to be invalid,
illegal,  or  unenforceable,  that  are  not  themselves  invalid,  illegal,  or
unenforceable)  will be construed so as to give effect to the intent  manifested
by the provision held invalid, illegal, or unenforceable.

         34.  Insurance,  Contracts,  and Funding.  The Company may purchase and
maintain  insurance to protect itself and any  Indemnitee  against any expenses,
judgments,  fines,  and amounts paid in settlement or incurred by any Indemnitee
in connection with any Proceeding referred to in By-Law 33 or otherwise,  to the
fullest extent  permitted by applicable  law as then in effect.  The Company may
enter into contracts with any person entitled to indemnification under By-Law 33
or otherwise,  and may create a trust fund,  grant a security  interest,  or use
other  means  (including  without  limitation  a letter of credit) to ensure the
payment  of such  amounts  as may be  necessary  to  effect  indemnification  as
provided in By-Law 33.





                                       17

<PAGE>

                                     GENERAL


         35. Fiscal Year. The fiscal year of the Company will end on December 31
or such date as may be fixed from time to time by the Board.

         36.  Seal.  The Board may  adopt a  corporate  seal and use the same by
causing it or a facsimile  thereof to be impressed or affixed or  reproduced  or
otherwise.

         37.  Reliance upon Books,  Reports,  and Records.  Each Director,  each
member of a committee  designated by the Board,  and each officer of the Company
will, in the performance of his or her duties,  be fully protected in relying in
good faith upon the records of the Company and upon such information,  opinions,
reports, or statements presented to the Company by any of the Company's officers
or employees, or committees of the Board, or by any other person or entity as to
matters the  Director,  committee  member,  or officer  believes are within such
other person's  professional or expert competence and who has been selected with
reasonable care by or on behalf of the Company.

         38. Time  Periods.  In applying  any  provision  of these  By-Laws that
requires that an act be done or not be done a specified  number of days prior to
an event or that an act be done  during a period of a  specified  number of days
prior to an event,  calendar days will be used unless otherwise  specified,  the
day of the doing of the act will be  excluded  and the day of the event  will be
included.

         39.  Amendments.  Except  as  otherwise  provided  by  law  or  by  the
Certificate of Incorporation, these By-Laws or any of them may be amended in any
respect or  repealed  at any time,  either (i) at any  meeting of  stockholders,
provided that any amendment or supplement  proposed to be acted upon at any such
meeting has been described or referred to in the notice of such meeting, or (ii)
at any meeting of the Board, provided that no amendment adopted by the Board may
vary or conflict with any amendment adopted by the stockholders.



                                       18

<PAGE>

         40.  Certain  Defined  Terms.  Terms used herein with  initial  capital
letters that are defined in the Certificate of Incorporation  are used herein as
so defined.








<PAGE>



                                                                      APPENDIX H

<PAGE>

Dear Stockholder:

   
A Special Meeting of Shareholders  of Video Sentry  Corporation  will be held at
the offices of Winthrop & Weinstine,  3000 Dain Bosworth  Plaza,  60 South Sixth
Street,  Minneapolis,  Minnesota, on February 6, 1997 at 10:00 a.m., local time.
At the  special  meeting,  Shareholders  will act to  consider  and vote  upon a
proposal  regarding  the  merger of Video  Sentry  Corporation  and Knogo  North
America Inc.
    

Your vote is  important.  Whether or not you plan to attend the meeting,  please
review the enclosed proxy statement, complete the proxy form below and return it
promptly in the envelope provided.


Sincerely,

Ronald V. McClurg
Corporate Secretary


- - - - - - - - - - - - - - - - - - - - - - - - - - - - -  - - - - - - - - - - - -

   
         Special Meeting of Stockholders -- To be held February 6, 1997
                   THE BOARD OF DIRECTORS SOLICITS THIS PROXY

The undersigned hereby (1) acknowledges receipt of the Notice of Special Meeting
of Shareholders (the "Special Meeting") of Video Sentry Corporation, a Minnesota
corporation ("Video"),  and the Joint Proxy  Statement/Prospectus  in connection
therewith and (2) appoints Robert D. Furst,  Jr. and Andrew L. Benson,  and each
of them, his proxies with full power of substitution  for and in the name, place
and stead of the  undersigned,  to vote upon and act with  respect to all of the
shares of Common Stock, par value $0.01 per share (the "Common Stock"), of Video
standing  in the  name  of  the  undersigned,  or  with  respect  to  which  the
undersigned  is  entitled  to vote and act,  at the  Special  Meeting and at any
adjournment or  postponement  thereof.  The proxies of the  undersigned may vote
according to their  discretion on any other matter that may properly come before
the Special Meeting or any adjournments or postponements thereof.


   THIS PROXY WILL BE VOTED AS SPECIFIED ON THE REVERSE. IF NO SPECIFICATION
              IS MADE, THIS PROXY WILL BE VOTED FOR PROPOSAL 1
    

Please date this proxy and sign your name exactly as it appears  hereon and mail
this proxy in the enclosed envelope. No postage is required. Where there is more
than one owner,  each should sign.  When signing as an attorney,  administrator,
executor,  guardian or trustee,  please add your title as such. If executed by a
corporation, the proxy should be signed by a duly authorized officer.

                 Continued and to be voted and signed on reverse

- - - - - -  - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

The Board of Directors recommends a vote FOR item (1) listed below.

   
(1)     To approve  and adopt the  Amended and  Restated  Agreement  and Plan of
        Reorganization and Merger, dated as of November 27, 1996, as amended, by
        and  between  Video,   Knogo  North  America  Inc.,   Sentry  Technology
        Corporation, Viking Merger Corp. and Strip Merger Corp.
    

                FOR                   AGAINST                   ABSTAIN

                |_|                     |_|                       |_|


                      PLEASE MARK ALL CHOICES LIKE THIS [X]


Signature____________________________ Date __________________

Signature____________________________ Date __________________


<PAGE>



                                                                      APPENDIX I
<PAGE>
   
                            KNOGO NORTH AMERICA INC.
                SPECIAL MEETING OF STOCKHOLDERS, FEBRUARY 6, 1997
                    PROXY SOLICITED BY THE BOARD OF DIRECTORS

     The undersigned  hereby  appoints Thomas A. Nicolette,  William A. Perlmuth
and Peter J. Mundy, or a majority of those present and acting, or if only one is
present,  then that one, proxies,  with full power of substitution,  to vote all
shares of KNOGO NORTH  AMERICA INC. (the  "Company")  which the  undersigned  is
entitled  to vote  at the  Company's  Special  Meeting  to be  held  at  Knogo's
corporate headquarters, 350 Wireless Boulevard, Hauppauge, New York, on February
6, 1997, at 11:00 A.M., New York time, and at any  adjournment  thereof,  hereby
ratifying all that said proxies or their  substitutes  may do by virtue  hereof,
and the undersigned authorizes and instructs said proxies to vote as follows:

               (Please sign on reverse side and return promptly)
    

<PAGE>

[ X ] Please mark your 
      vote as in this example


     1. MERGER  PROPOSAL:  Check the  appropriate  box to indicate the manner in
which you direct the proxies to vote your shares in connection with the Proposal
to adopt the Amended  and  Restated  Agreement  and Plan of  Reorganization  and
Merger  among  Video  Sentry   Corporation,   the  Company,   Sentry  Technology
Corporation,  Viking Merger Corp. and Strip Merger Corp.,  all as described more
fully in the accompanying Joint Proxy Statement/Prospectus:

                 [  ]  FOR         [  ]  AGAINST       [  ]  ABSTAIN


     2. In their  discretion,  upon any other  matters  which may properly  come
before the meeting or any adjournments thereof.


     THIS  PROXY WHEN  PROPERLY  EXECUTED  WILL BE VOTED IN THE MANNER  DIRECTED
HEREIN BY THE UNDERSIGNED STOCKHOLDER.  IF NO DIRECTION IS MADE, THIS PROXY WILL
BE VOTED FOR PROPOSAL 1.
         ---

     Receipt  of the  Notice  of  Special  Meeting  and Joint  Proxy  Statement/
Prospectus is hereby acknowledged.

 PLEASE DATE, SIGN AND RETURN THIS PROXY PROMPTLY USING THE ENCLOSED ENVELOPE.

                                             

                                            
                                            

 ___________________________________        ___________________________________
 (Signature of Stockholder)                 (Signature of Stockholder)

                                            Dated _______________________, 1997
                                                                              


Your  signature  should  appear the         
same as your name  appears  hereon.
If signing as  attorney,  executor,
administrator, trustee or guardian,
please  indicate  the  capacity  in
which  signing.   When  signing  as
joint  tenants,  all parties to the
joint  tenancy must sign.  When the
proxy is given by a corporation  it
should be  signed by an  authorized
officer.



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