VIDEO SENTRY CORP
8-K, 1996-12-20
RADIO & TV BROADCASTING & COMMUNICATIONS EQUIPMENT
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

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

                                    FORM 8-K

                                 CURRENT REPORT

                     PURSUANT TO SECTION 13 or 15(d) OF THE
                        SECURITIES EXCHANGE ACT OF 1934

               Date of Report (Date of earliest event reported):

                               November 27, 1996


                            Video Sentry Corporation
             (Exact name of registrant as specified in its charter)

                                   Minnesota
                    (State or jurisdiction of incorporation)

       0-24820                                             41-1679157
(Commission File Number)                       (IRS Employer Identification No.)

6365 Carlson Drive, Eden Prairie, MN                        91521
(Address of principal executive offices)                  (Zip Code)

                                 (612) 934-9900
                        (Registrant's Telephone Number)

<PAGE>

Item 5. Other Events

     Video  Sentry   Corporation   and  Knogo North  America  Inc.,  a  Delaware
corporation,  have announced that they have amended and restated, as of November
27, 1996, the merger  agreement  which they entered into on October 10, 1996 (as
so amended and restated,  the "Amended and Restated  Merger  Agreement")  which,
following  the approval of the merger by the shareholders  of the two companies,
will result in the formation of a new publicly traded entity to be called Sentry
Technology  Corporation.  The Amended and Restated Merger  Agreement is filed as
Exhibit 2.1 hereto and is incorporated herein by reference.


     In  addition,  on  December 5, 1996,  the Company and Knogo  issued a joint
press  release  announcing  the  execution  of the Amended and  Restated  Merger
Agreement,   which  press  release  is  attached  hereto  as  Exhibit  99.1  and
incorporated herein by reference.

Item 7.  Financial Statements and Exhibits

          (c)  Exhibits.

               2.1  Amended and Restated  Agreement and  Plan of  Reorganization
                    and Merger,  dated as of November  27, 1996,  between  Video
                    Sentry   Corporation,   Knogo  North  America  Inc.,  Sentry
                    Technology  Corporation,  Viking  Merger  Corp.,  and  Strip
                    Merger Corp.

              99.1  Joint press relase,  dated December 5, 1996, of Video Sentry
                    Corporation and Knogo North America Inc.


<PAGE>


                                   SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
Registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned hereunto duly authorized.

                                   VIDEO SENTRY CORPORATION

                                   By:   /s/ Robert D. Furst, Jr.
                                       ------------------------------
                                        Robert D. Furst, Jr.
                                        Chairman of the Board and
                                        Chief Executive Officer


Date: December 20, 1996

<PAGE>


                                 EXHIBIT INDEX


Number                   Subject Matter
- ------                   --------------

2.1      Amended and Restated  Agreement and Plan of Reorganization  and Merger,
         dated as of November 27, 1996, between Video Sentry Corporation,  Knogo
         North America Inc., Sentry Technology Corporation, Viking Merger Corp.,
         and Strip Merger Corp.

99.1     Joint  press   release,   dated  December  5,  1996,  of  Video  Sentry
         Corporation and Knogo North America Inc.


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


                              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
                                       28
<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)
                                       29
<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;
                                       30
<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
                                       31
<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
                                       32
<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
                                       34
<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.
                                       43
<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
                                       44
<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 of the Board
                                                       and Chief Executive 
                                                       Officer
                                                      --------------------------



                                                KNOGO NORTH AMERICA INC.

                                                By:  /s/ T.A. Nicolette
                                                    ----------------------------
                                                Name:    T.A. Nicolette
                                                      --------------------------
                                                Title: President and Chief
                                                       Executive Officer
                                                      --------------------------


                                                SENTRY TECHNOLOGY CORPORATION

                                                By:  /s/ Robert D. Furst, Jr.
                                                    ---------------------------
                                                Name:   Robert D. Furst, Jr.
                                                      --------------------------
                                                Title: Chairman of the Board
                                                       and Chief Executive 
                                                       Officer
                                                      --------------------------


                                                VIKING MERGER CORP.

                                                By:  /s/ Robert D. Furst, Jr.
                                                    ---------------------------
                                                Name:   Robert D. Furst, Jr.
                                                      --------------------------
                                                Title: Chairman of the Board
                                                       and Chief Executive 
                                                       Officer
                                                      --------------------------


                                                STRIP MERGER CORP.



                                                By:  /s/ Robert D. Furst, Jr.
                                                    ---------------------------
                                                Name:   Robert D. Furst, Jr.
                                                      --------------------------
                                                Title: Chairman of the Board
                                                       and Chief Executive 
                                                       Officer
                                                      --------------------------

<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

FOR IMMEDIATE RELEASE
- ---------------------


CONTACT:          Thomas A. Nicolette                 or       Robert D. Furst
                  CEO, KNOGO North America Inc.                CEO, Video Sentry
                  516-232-2100                                 Corporation
                                                               612-934-9900


                      VIDEO SENTRY AND KNOGO NORTH AMERICA
                             REVISE MERGER AGREEMENT

NEW YORK,  NY,  December 5, 1996 - Video Sentry  Corporation  (Nasdaq:  VSEN), a
pioneer in  traveling  video  security  systems,  and KNOGO North  America  Inc.
(AMEX:KNA),  a leading  manufacturer of Electronic  Article  Surveillance  (EAS)
systems,  today  announced that they have filed with the Securities and Exchange
Commission (SEC) a preliminary  proxy/prospectus  with respect to their proposed
merger  into  a new  publicly  traded  entity  to be  called  Sentry  Technology
Corporation  (STC).  The  merger,  which has been  unanimously  approved by both
boards of directors,  is subject to approval by the holders of a majority of the
outstanding  common  stock of both  companies.  In this  regard,  the  companies
announced  that  they  expect  to  mail  proxy  materials  to  their  respective
shareholders  after  completing SEC review and anticipate  that the  shareholder
meetings and closing may occur in January 1997.  They also  announced  that they
have amended their outstanding merger agreement,  originally executed in October
1996, to clarify certain details and to link the redemption  hurdle price on the
STC Preferred share (i.e., the price over which STC Common share appreciation is
taken into account in the STC Preferred share redemption  price) more closely to
the market  price of STC Common  shares.  Instead of  equaling a fixed  price of
$6.50 per share,  the hurdle  price shall  equal the STC Common  share price one
year from the date of closing, but not less than $5.00 or more than $6.50.

         Video Sentry  Corporation,  headquartered  in  Minneapolis,  MN, is the
industry leader in the design, manufacture and marketing of a patented traveling
closed circuit television (CCTV) surveillance system.

         KNOGO North America Inc.,  headquartered  in Long Island,  NY, designs,
manufactures,  sells and services EAS and Closed Circuit Video  equipment in the
United  States  and  Canada to deter  shoplifting  and other  types of theft for
retailers,  supermarkets,  libraries  and  commercial  enterprises.  KNOGO  is a
spin-off of KNOGO Corporation, founder of the EAS industry 30 years ago.
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