DETECTION SYSTEMS INC
10-Q, 1998-11-16
COMMUNICATIONS EQUIPMENT, NEC
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                                UNITED STATES
                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549


                                  FORM 10-Q

(Mark One)
[X] QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
    EXCHANGE ACT OF 1934

    For the quarterly period ended September 30, 1998

                              OR

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(D) OF THE SECURITIES
    EXCHANGE ACT OF 1934

    For the transition period from ______ to __________


                        Commission File Number: 0-8125


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


                           DETECTION SYSTEMS, INC.
            (Exact name of registrant as specified in its charter)


State of New York                               16-0958589
(State or other jurisdiction                    (I.R.S. Employer
of incorporation or organization)               Identification No.)

                130 Perinton Parkway, Fairport, New York 14450
             (Address of principal executive offices) (Zip Code)

                                (716) 223-4060
             (Registrant's telephone number, including area code)

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

Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2)  has  been  subject  to the  filing
requirements for the past 90 days. Yes _X_ No ____


As  of  November  6,  1998  there  were  outstanding  6,327,182  shares  of  the
registrant's common stock, par value $.05 per share.

<PAGE>
                            PART I FINANCIAL INFORMATION
                      DETECTION SYSTEMS, INC. AND SUBSIDIARIES
                             Consolidated Balance Sheet
                       (in thousands, except per share data)
<TABLE>
<S>                                            <C>              <C>  
Assets                                         Sept. 30, 1998   March 31, 1998
Current assets:                                   (Unaudited)
Cash and cash equivalents                              $1,759           $3,160
Accounts receivable, less allowance for
  doubtful accounts ($1,215 and $1,033,
  respectively)                                        24,570           23,505
Inventories                                            41,561           38,154
Other current assets                                    4,557            3,701
                                                       ------           ------
                                                       72,447           68,520

Fixed assets, net                                      11,999           12,142
Goodwill and other intangibles                         10,196            8,907
Other assets                                            4,761            4,475
                                                       ------           ------
                                                      $99,403          $94,044
                                                       ======           ======
Liabilities
Current liabilities:
   Short term borrowings                               $7,186          $ 4,002
   Current portion of long term debt                      400              405
   Accounts payable                                    10,995           12,368
   Accrued payroll and benefits                         1,859            1,636
   Other current liabilities                            7,641            5,165
                                                       ------           ------
                                                       28,081           23,576

Other liabilities                                       2,365            2,655
Long term debt                                         15,442           16,549

Shareholders' equity:
  Common stock, par value $.05 per share;
   Authorized - 24,000 shares; Issued -
   6,555 shares and 6,518 shares,
   respectively                                           328              326
Capital in excess of par value                         45,099           44,805
Retained earnings                                      12,038            9,976
                                                       ------           ------
                                                       57,465           55,107
Less - Treasury stock, at cost                         (3,783)          (3,785)
  Notes receivable for stock purchases                   (146)             (14)
  Cumulative translation adjustment                       (21)             (44)
                                                       ------           ------
                                                       53,515           51,264
                                                       ------           ------
                                                      $99,403          $94,044
                                                       ======           ======
</TABLE>

        (See accompanying notes to consolidated financial statements)
<PAGE>

                  DETECTION SYSTEMS, INC. AND SUBSIDIARIES
    Consolidated Statement of Operations and Retained Earnings (Unaudited)
                    (in thousands, except per share data)

<TABLE>
<S>                                         <C>                <C>  
                                            Sept. 30, 1998      Sept. 30, 1997
For the Three Months Ended:                  (Current Year)    (Preceding Year)
                                            --------------     ---------------
Net sales                                          $35,455             $34,463

Costs and expenses:
 Production                                         22,225              23,033
 Research and development                            1,956               2,203
 Marketing, administrative and general               8,880               7,489
                                                    ------              ------
Total costs and expenses                            33,061              32,725

Operating income                                     2,394               1,738
Other income (expense)
 Interest income                                        64                   3
 Interest expense                                     (427)               (817)
 Other income (expense)                                (20)                 23
                                                    ------              ------
Income before income taxes                           2,011                 947
Provision for income taxes                             781                 275
                                                    ------              ------
Net income                                         $ 1,230               $ 672
                                                    ======              ======

Retained earnings at beginning of period            10,808               9,740
                                                    ------              ------
Retained earnings at end of period                 $12,038             $10,412
                                                    ======              ======
Earnings per share
 Basic                                               $0.19               $0.14
                                                      ====                ====
 Diluted                                             $0.18               $0.12
                                                      ====                ====
</TABLE>

        (See accompanying notes to consolidated financial statements)
<PAGE>
                   DETECTION SYSTEMS, INC. AND SUBSIDIARIES
    Consolidated Statement of Operations and Retained Earnings (Unaudited)
                    (in thousands, except per share data)

<TABLE>
<S>                                         <C>                <C> 
                                            Sept. 30, 1998      Sept. 30, 1997
For the Six Months Ended:                    (Current Year)    (Preceding Year)
                                            --------------     ---------------
Net sales                                          $69,263             $62,671

Costs and expenses:
 Production                                         43,511              40,589
 Research and development                            4,090               4,288
 Marketing, administrative and general              17,508              13,876
                                                    ------              ------
Total costs and expenses                            65,109              58,753

Operating income                                     4,154               3,918
Other income (expense)
 Interest income                                       118                   6
 Interest expense                                     (836)             (1,454)
 Other income (expense)                                (62)                239
                                                    ------              ------
Income before income taxes                           3,374               2,709
Provision for income taxes                           1,312                 904
                                                    ------              ------
Net income                                         $ 2,062             $ 1,805
                                                    ======              ======

Retained earnings at beginning of period             9,976               8,594

Amortization of redeemable common stock                                     13
                                                    ------              ------
Retained earnings at end of period                 $12,038             $10,412
                                                    ======              ======
Earnings per share
 Basic                                               $0.33               $0.38
                                                      ====                ====
 Diluted                                             $0.30               $0.34
                                                      ====                ====
</TABLE>

        (See accompanying notes to consolidated financial statements)

<PAGE>
                  DETECTION SYSTEMS, INC. AND SUBSIDIARIES
               Consolidated Statement of Cash Flows (Unaudited)
                          (in thousands of dollars)
<TABLE>
<S>                                                     <C>           <C>  

For the Six Months Ended September 30,                    1998          1997
Cash flows from operating activities:                     ----          ----
Net income                                              $2,062        $1,805
                                                         -----         -----
Adjustments to reconcile net income to net cash
   provided by operating activities:
  Depreciation and amortization                          1,829         2,271
  Deferred compensation                                                  457
  Stock based compensation                                                86

Changes in assets and liabilities:
  Accounts receivable                                     (950)       (1,428)
  Inventories                                           (2,777)        3,773
  Accounts payable                                      (1,723)       (3,228)
  Accrued payroll and benefits                             223           (11)
  Other assets & liabilities                               110        (4,980)
                                                        ------        ------
  Total adjustments                                     (3,288)       (3,060)
                                                        ------        ------
   Net cash used in operating activities                (1,226)       (1,255)

Cash flows from investing activities:
   Capital expenditures                                 (1,584)       (1,212)
   Acquisition of businesses                              (473)       (6,816)
                                                        ------        ------
   Net cash used in investing activities                (2,057)       (8,028)
 
Cash flows from financing activities:
   Proceeds from borrowings                              3,322         6,718
   Proceeds from issuance of common stock                             24,259
   Principal payments on debt and
    capital lease obligations                           (1,372)      (18,844)
   Common stock transactions, net                          (91)          486
                                                         -----        ------
   Net cash provided by financing activities             1,859        12,619

Effect of exchange rates                                    23          (144)
                                                         -----         -----
Net(decrease)increase in cash and cash equivalents      (1,401)        3,192

Cash and cash equivalents, beginning of period           3,160         2,244
                                                         -----         -----
Cash and cash equivalents, end of period                $1,759        $5,436
                                                         =====         =====
Cash paid during the period for:
   Interest                                            $   863        $1,113
                                                           ===         =====
   Income taxes                                        $   458        $1,577
                                                           ===         =====
</TABLE>

        (See accompanying notes to consolidated financial statements)

<PAGE>
                   DETECTION SYSTEMS, INC. AND SUBSIDIARIES
                        NOTES TO FINANCIAL STATEMENTS
        THREE AND SIX MONTH PERIODS ENDED SEPTEMBER 30, 1998 AND 1997
                                 (Unaudited)

NOTE 1. GENERAL

The accompanying  unaudited interim consolidated  financial statements have been
prepared in accordance  with the rules and  regulations  of the  Securities  and
Exchange Commission (SEC). The interim consolidated financial statements include
the  consolidated  accounts of Detection  Systems,  Inc. and its  majority-owned
subsidiaries  (collectively,  "the Company") with all  significant  intercompany
transactions  eliminated.   In  the  opinion  of  management,   all  adjustments
(consisting only of normal recurring adjustments) necessary for a fair statement
of the financial position,  results of operations and cash flows for the interim
periods presented have been made. Certain footnote disclosures normally included
in  financial   statements   prepared  in  accordance  with  generally  accepted
accounting principles (GAAP) have been condensed or omitted pursuant to such SEC
rules and regulations.  These financial statements should be read in conjunction
with the Company's Annual Report on Form 10-K for the year ended March 31, 1998.

Cash flow  statement  - During the first  quarter of fiscal  1999,  the  Company
issued  28,161  shares of common stock in  connection  with the  acquisition  of
EFSEC.  During the first quarter of fiscal 1998,  the Company issued 221,738 and
34,141 shares of common stock in  connection  with the  acquisitions  of Digital
Audio Ltd. ("DA Systems") and Seriee S.A. ("Seriee"), respectively (see Note 3).

NOTE 2.  INVENTORIES

Major classifications of inventory follow (in thousands):
<TABLE>
<S>                                <C>                   <C>   
                                   Sept. 30, 1998        March 31, 1998
                                   --------------        --------------
Component Parts                           $18,711               $22,061
Work In Process                             2,782                 1,488
Finished Products                          20,068                14,605
                                           ------                ------
                                          $41,561               $38,154
                                           ======                ======
</TABLE>

NOTE 3.  ACQUISITIONS

Fiscal  1999  Acquisitions  - In June  1998,  the  Company  acquired  all of the
outstanding stock of EFSEC AB ("EFSEC")for approximately $1,250,000 comprised of
cash and 28,161 shares of its common stock.  EFSEC is a Swedish  distributor  of
electronic  security  equipment  and  had  annual  net  sales  of  approximately
$3,000,000 prior to its acquisition.

In June 1998, the Company acquired all of the outstanding  stock of Alarm Center
Kft  ("Alarm  Center")  for  $125,000  in  cash.  Alarm  Center  is a  Hungarian
distributor  of  electronic  security  equipment  and had  annual  net  sales of
approximately $500,000 prior to its acquisition.

<PAGE>
Fiscal  1998  Acquisitions  - In  May  1997,  the  Company  acquired  all of the
outstanding  stock of DA Systems in exchange  for  221,738  shares of its common
stock.  The shares were callable at the  Company's  option at $17 per share plus
interest at 8.25% until June 30,  1998,  and could be put to the Company at that
price after that date. The Company exercised its call option to repurchase these
shares in connection  with the issuance of common stock in September  1997.  The
cost of this acquisition was approximately  $4,000,000.  DA Systems is a British
manufacturer  of  security  control  equipment  and  had  annual  net  sales  of
approximately $10,800,000 prior to its acquisition.

In June 1997, the Company  acquired 99.5% of the outstanding  stock of Seriee of
France,  in  exchange  for  34,141  shares  of  its  common  stock,   valued  at
approximately  $600,000.  Seriee is a  manufacturer  of  electronic  control and
communication  equipment  and had annual net sales of  approximately  $6,300,000
prior to its acquisition.

In  June  1997,  the  Company  acquired  98.7%  of  the  outstanding   stock  of
Radio-Active  Systems  N.V.("RAS")  of Belgium for  approximately  $3,600,000 in
cash.  RAS had  annual  net  sales  of  approximately  $9,900,000  prior  to its
acquisition.

In November 1997, the Company acquired all of the outstanding  stock of Security
Supplies NZ Ltd. ("Security  Supplies") of New Zealand for approximately $50,000
in cash.  Security Supplies had annual sales of approximately  $800,000 prior to
its acquisition.

In  January  1998,  the  Company  acquired  all  of  the  outstanding  stock  of
Electronics  Design & Manufacturing Pty Limited ("EDM") of Australia in exchange
for 186,667  shares of its common stock and  $2,800,000 in cash.  EDM had annual
net sales of approximately $4,600,000 prior to its acquisition.

These  transactions have been accounted for as purchases and,  accordingly,  the
results of DA Systems,  Seriee,  RAS,  Security  Supplies,  EDM, EFSEC and Alarm
Center are included in the consolidated  financial  statements as of the date of
acquisition.  The  financial  statements  reflect  the final  allocation  of the
purchase  price for each business,  except for EDM, EFSEC and Alarm Center,  for
which the purchase price allocation has not been finalized.  Unallocated  excess
of  purchase  price  over  net  assets  acquired  as of  September  30,  1998 is
$3,331,000 and is included with goodwill and other intangibles.

NOTE 4 - EARNINGS PER SHARE

There are no  significant  reconciling  items between net income as presented in
the  consolidated  statement of  operations  and net income  available to common
shareholders  used in the calculation of earnings per share.  Reconciling  items
between  the  number  of shares  used in the  calculation  of basic and  diluted
earnings per share relate to deferred  compensation plans, options and warrants,
as follows (in thousands):

<TABLE>
<S>                                           <C>               <C>    
                                              Three months        Six months
                                             ended Sept. 30,    ended Sept. 30,
                                              1998     1997      1998    1997
                                              ----     ----      ----    ----
Weighted average number of shares
outstanding                                  6,324    4,837     6,307   4,724

Shares associated with deferred
  compensation, option and warrant plans       515      603       523     583
</TABLE>

<PAGE>

NOTE 5 - RESTRUCTURING

The Company recorded a restructuring charge of approximately $400,000 during the
first quarter of fiscal 1999 for severance  costs related to the  termination of
employees at the Fairport, New York and Southall, England facilities. The charge
has been included in the results from  continuing  operations and had a material
impact on operating  results in the first quarter of 1999.  These  manufacturing
employees  will be  terminated  during  fiscal  1999,  thus the accrual has been
included in other current liabilities at September 30, 1998.

                   DETECTION SYSTEMS, INC. AND SUBSIDIARIES
               MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
                      CONDITION AND RESULTS OF OPERATIONS

Overview

The Company is a leading  supplier of  equipment  to the  electronic  protection
industry.  The Company designs,  manufactures and markets electronic  detection,
control and  communication  equipment  for  security,  fire  protection,  access
control and CCTV  applications,  offering products  primarily for the commercial
and mid- to high-end  residential  portions of the market.  From its founding in
1968 until  1995,  the  Company was  primarily  a niche  provider  of  intrusion
detection  devices for the  domestic  market.  In 1995,  the  Company  adopted a
strategy designed to substantially  expand its product  offerings,  establish an
international  sales presence,  increase its manufacturing  capacity and improve
its manufacturing  cost structure.  The Company has since made nine acquisitions
and  established a  manufacturing  facility in China.  Recent  acquisitions  are
described  in  Note  3.  These  acquisitions  had a  significant  impact  on the
comparative  information  for the six  month  and  three  month  periods  ending
September 30, 1998 and 1997 with respect to results of operations.

The  Company  recognizes  net sales upon  shipment  of  products  to  customers.
Production expenses include materials,  direct labor and manufacturing  overhead
as well as an allocated portion of indirect overhead.  Outgoing freight, customs
and other costs associated with delivery of products to customers are classified
under marketing,  administrative and general expenses.  Research and development
expenses  include  costs  associated  with  salaries  and  benefits  for certain
engineering employees,  supplies, agency approvals,  depreciation and occupancy,
as well as charges for independent  testing and independent  contractors engaged
for specific  projects.  Marketing,  administrative and general expenses include
costs  related  to  the  Company's  sales  efforts  and  corporate  and  general
administrative functions, including costs of executive, administrative and sales
personnel,    marketing/selling   supplies,   advertising,    depreciation   and
professional fees.

<PAGE>
Results of Operations

The following table sets forth, for the periods indicated, the percentages which
certain items of income and expense bear to net sales:
<TABLE>
<S>                         <C>                 <C>             <C>    
                                Fiscal Year      Three Months      Six Months
                              Ended March 31,   Ended Sept. 30,  Ended Sept. 30
                               1998     1997     1998     1997     1998    1997
                               ----     ----     ----     ----     ----    ----
Net sales                    100.0%    100.0%  100.0%    100.0%  100.0%   100.0%
Costs and expenses:
 Production                   66.4      64.2    62.7      66.8    62.8     64.8
 Research and development      6.8       8.0     5.5       6.4     5.9      6.8
 Marketing, administrative
  and general                 23.2      21.2    25.0      21.8    25.3     22.1
                              ----      ----    ----      ----    ----     ----
Operating income               3.6       6.6     6.8       5.0     6.0      6.3
Other income (expense)
 Interest income               0.2       0.1     0.2       0.0     0.2      0.0
 Interest expense             (1.8)     (1.7)   (1.2)     (2.3)   (1.2)    (2.3)
 Other income (expense)       (0.2)      0.2    (0.1)      0.0    (0.1)     0.3
                              ----      ----    ----       ----   ----     ----
Income before income taxes     1.8       5.2     5.7       2.7     4.9      4.3
Provision for income taxes     0.7       1.5     2.2       0.8     1.9      1.4
                              ----       ----   ----       ----   ----     ----
 Net income                    1.1%      3.7%    3.5%      1.9%    3.0%     2.9%
                               ===       ===     ===       ===     ===      ===

</TABLE>
 
Three Months Ended  September 30, 1998 Compared to Three Months Ended  September
30, 1997

The Company's net sales  increased 2.9% to $35,455,000 in the fiscal 1999 period
from  $34,463,000  in the  comparable  period in fiscal  1998.  The net sales of
acquired  businesses  accounted  for  $2,839,000  of net  sales.  Net sales from
on-going  operations  were  $32,616,000 in the fiscal 1999 period.  Sales by the
Company's  on-going  operations  have been impacted  compared to the  comparable
period of the prior year by lower sales to one of the Company's  major customers
and by the acquisition of two of the Company's customers by other businesses who
are not standardized on the Company's products.

Production expenses decreased 3.5% to $22,225,000 in the fiscal 1999 period from
$23,033,000  in the  comparable  period in fiscal 1998.  As a percentage  of net
sales, production expenses decreased to 62.7% in the fiscal 1999 period compared
to 66.8% in the  comparable  period in fiscal 1998.  The decrease in  production
expenses in aggregate  and as a  percentage  of net sales was  primarily  due to
changes in product mix and  improvements  in the  Company's  manufacturing  cost
structure.

Research and  development  expenses  decreased 11.2% to $1,956,000 in the fiscal
1999  period  from  $2,203,000  in the  comparable  period in fiscal  1998.  The
decrease in research and development  expenses is primarily  attributable to the
reduced use of outside consultants.  As a percentage of net sales,  research and
development  expenses  decreased  to 5.5% in the fiscal 1999 period from 6.4% in
the comparable period in 1998. The decrease in research and development expenses
as a  percentage  of net sales was  primarily  due to the reduced use of outside
consultants and the acquisition of redistributor  businesses  during fiscal 1999
and  1998  which  have  sales  but  do  not  incur   research  and   development
expenditures.

<PAGE>

Marketing,  administrative and general expenses increased 18.6% to $8,880,000 in
the fiscal 1999 period from $7,489,000 in the comparable  period in fiscal 1998.
As a percentage of net sales,  marketing,  administrative  and general  expenses
increased to 25.0% in the fiscal 1999 period from 21.8% in the comparable period
in fiscal 1998. The increase in marketing,  administrative  and general expenses
in  aggregate  and  as a  percentage  of  net  sales  was  primarily  due to the
acquisition of businesses in fiscal 1999 and additional  marketing  expenditures
incurred by the Company's domestic businesses.

Interest  expense  decreased to $427,000 in the fiscal 1999 period from $817,000
in the  comparable  period in 1998.  This  decrease was  primarily  due to lower
borrowings outstanding.  Approximately $18,800,000 in debt was repaid during the
second  quarter of fiscal 1998 with proceeds from the Company's  September  1997
public offering of common stock.

The  Company's  effective  income tax rate for the fiscal  1999 period was 38.8%
compared to 29.0% for the comparable period in fiscal 1998. The higher effective
rate is  attributable  to changes in the mix of the Company's  income  generated
from domestic and international entities as well as the impact of non-deductible
goodwill.

Six Months Ended  September 30, 1998 Compared to Six Months Ended  September 30,
1997

     The Company's net sales  increased  10.5% to $69,263,000 in the fiscal 1999
period from  $62,671,000 in the comparable  period in fiscal 1998. The net sales
of acquired  businesses  accounted for  $8,239,000 of net sales.  Net sales from
on-going  operations  were  $61,024,000 in the fiscal 1999 period.  Sales during
this period by the Company's on-going  operations have been impacted compared to
the  comparable  period of the prior year by lower sales to one of the Company's
major  customers and by the  acquisition  of two of the  Company's  customers by
other businesses who are not standardized on the Company's products.

     Production expenses increased 7.2% to $43,511,000 in the fiscal 1999 period
from $40,589,000 in the comparable period in 1998. As a percentage of net sales,
production  expenses  decreased  to 62.8% in the fiscal 1999 period  compared to
64.8% in the  comparable  period in fiscal  1998.  The  increase  in  production
expenses was  primarily  due to a  corresponding  increase in the  Company's net
sales.  The decrease in  production  expenses as a  percentage  of net sales was
primarily  due to changes  in  product  mix and  improvements  in the  Company's
manufacturing cost structure.

     Research and  development  expenses  decreased  4.6% to  $4,090,000  in the
fiscal 1999 period from $4,288,000 in the comparable  period in fiscal 1998. The
decrease in research and development  expenses is primarily  attributable to the
reduced use of outside consultants.  As a percentage of net sales,  research and
development  expenses  decreased  to 5.9% in the fiscal 1999 period from 6.8% in
the comparable period in 1998. The decrease in research and development expenses
as a  percentage  of net sales was  primarily  due to the reduced use of outside
consultants and the acquisition of redistributor  businesses  during fiscal 1999
and  1998  which  have  sales  but  do  not  incur   research  and   development
expenditures.

     Marketing,   administrative   and  general  expenses   increased  26.2%  to
$17,508,000 in the fiscal 1999 period from $13,876,000 in the comparable  period
in fiscal 1998.  As a percentage  of net sales,  marketing,  administrative  and

<PAGE>

general expenses  increased to 25.3% in the fiscal 1999 period from 22.1% in the
comparable period in fiscal 1998. The increase in marketing,  administrative and
general  expenses was primarily due to the  acquisition  of businesses in fiscal
1998. In addition, a charge of approximately  $400,000 was recorded in the first
quarter of fiscal 1999 relating to the restructuring of the Company's  Fairport,
New York and Southall,  England  manufacturing  facilities.  This  restructuring
relates to severance  associated with the transfer of  manufacturing  from those
facilities to the Company's  China  facility.  It is expected that these actions
will be  substantially  completed by the end of fiscal 1999. The Company expects
to save approximately $2.0 million annually in salaries and benefits as a result
of this action.

     Interest  expense  decreased  to  $836,000  in the fiscal  1999 period from
$1,454,000 in the comparable  period in 1998. This decrease was primarily due to
lower  borrowings  outstanding.  Approximately  $18,800,000  in debt was  repaid
during  the second  quarter  of fiscal  1998 with  proceeds  from the  Company's
September 1997 public offering of common stock.

     The  Company's  effective  income tax rate for the fiscal  1999  period was
38.9%  compared to 33.4% for the  comparable  period in fiscal 1998.  The higher
effective  rate is  attributable  to changes in the mix of the Company's  income
generated  from  domestic  and  international  entities as well as the impact of
non-deductible goodwill.

Liquidity and Capital Resources

     The  Company  considers  liquidity  to be its ability to meet its long- and
short-term cash  requirements.  Prior to 1996, those requirements were primarily
met by cash generated by the Company's  operating  activities and cash reserves.
Since the 1995  implementation of the Company's strategy designed to enhance its
product  offerings,   manufacturing   capacity  and  international   operations,
particularly  its  acquisitions  and the development of the China facility,  the
Company has required  external  sources of  financing  to satisfy its  liquidity
needs.

     Six Months Ended September 30, 1998.  During the six months ended September
30, 1998, the Company's  operating  activities used $1,226,000 of operating cash
flow. Net income, depreciation and amortization provided $3,891,000, an increase
in  inventories  used  $2,777,000,  and a  decrease  in  accounts  payable  used
$1,723,000. Other account changes used $617,000 of operating cash flow.

     During the six months ended  September  30, 1998,  cash used for  investing
activities  was  $2,057,000  and was utilized for the  acquisition  of EFSEC and
Alarm Center and for capital expenditures.

     During the six months ended  September 30, 1998, cash provided by financing
activities was $1,859,000,  primarily  representing  proceeds from borrowings to
finance operations and capital expenditures.

     Capital Resources.  On September 30, 1998, the Company had cash balances of
$1,759,000.  On that  date,  the  Company  had a  $17,000,000  revolving  credit
facility  under which it had borrowed  $5,784,000.  This credit  facility  bears
interest  based on the prime rate or the London  Interbank  Offered  Rate,  plus
applicable  points  based on the  Company's  degree of financial  leverage.  The
agreement  matured  on July 31,  1998.  However,  the line has now been  renewed
through July 31, 2000.

<PAGE>

     The Company expects to continue to pursue  acquisitions and the development
of  new  products  and  markets.  On-going  capital  expenditures  will  include
continued investment in facilities and equipment necessary to produce and market
its security, fire detection, access control and CCTV products. The Company also
plans to continue its efforts to market its products internationally.

     The Company  believes that the  combination  of its current cash  balances,
cash flows from operations and existing credit  facilities will be sufficient to
fund its planned operations during fiscal 1999.

     Year 2000 Issues.  The Company has appointed a team to assess the impact of
the year 2000 on its  information  systems,  products,  and business.  This team
includes two members of senior  management  and is lead by the Vice President of
Operations. To ensure year 2000 compliance, the Company has established specific
categories to be reviewed:

Products.  The Company has placed a high  priority on ensuring  its products are
year 2000 ready and is completing a comprehensive  review of year 2000 readiness
of its  products.  The Company has reviewed all products  that are  manufactured
domestically and at its China manufacturing facility and believes these products
to be year 2000 compatible.  The Company has also evaluated  products  purchased
for resale by its domestic  businesses  and believes  these  products to be year
2000 compatible.  The Company is currently  assessing year 2000 compatibility of
products   manufactured   and   purchased   for  resale  at  its  other  foreign
subsidiaries.  The  Company  does not expect  significant  issues with year 2000
readiness  of product  sold by its foreign  subsidiaries  as product sold by the
Company generally does not use date information for calculations or comparisons.

Manufacturing.  Some of the tools and equipment  (hardware and software) used to
develop and manufacture the Company's products are  date-sensitive.  The Company
believes  that  the  critical  tools  and  equipment  used by it to  manufacture
products will be "year 2000 ready" or will be made ready through upgrades by the
suppliers  of the tools or  equipment.  As a result the Company  does not expect
significant  interruption  to  its  manufacturing  capabilities  because  of the
failure of tools and/or equipment.

Non-Manufacturing Business Applications.  Throughout the business the Company is
fixing and  testing all  non-manufacturing  business  applications  such as core
financial    information    and   reporting    systems,    procurement,    human
resources/payroll,  factory applications,  customer service systems, and revenue
systems, and does not expect any significant year 2000 problems in this area.

The  Company's  domestic  business  information  systems  required  upgrades and
enhancements to be made year 2000  compliant.  These upgrades have been made and
are  currently  being  tested.  Testing of year 2000  upgrades is expected to be
completed prior to the year 2000.

Most of the  Company's  non-US  subsidiaries'  information  systems will require
various  degrees of upgrade or  replacement  to be capable of handling year 2000
issues  (excluding  the Hong  Kong  subsidiary,  which  utilizes  the  Company's
domestic  information  system). The Company is in the process of converting each
of its non-US  subsidiaries to new enterprise  resource planning systems capable
of handling  the year 2000.  The Company  expects to be capable of handling  the
year  2000  at  all  locations  without  significant  interruption  to  business
activity.

<PAGE>

Facilities  and  Infrastructure.  The Company has evaluated its  facilities  and
infrastructure   (health,    safety   and   environment   systems,    buildings,
security/alarms/doors, desktop computers, networks) to ensure they are year 2000
ready.  Upgrades  are being  implemented  where  needed and the Company does not
expect significant  interruption to its operations because of year 2000 problems
with its facilities and infrastructure.

Logistics.  The  Company has devoted  significant  resources  to ensure that its
operations  are not  disrupted  because of services or products  supplied to the
Company.

Of importance to the Company for year 2000 is the readiness of suppliers and the
products the Company  procures from  suppliers.  The Company has a comprehensive
program  to  identify  and  obtain  year  2000  information  from  its  critical
suppliers. The program includes awareness letters, questionnaires,  and a review
of  suppliers'  year 2000  web-sites.  If a  supplier  is of  concern  regarding
non-year  2000  readiness,  the Company will develop  contingency  and alternate
sourcing plans to minimize the year 2000 risk.

The Company  estimates that the expected total aggregate costs for its year 2000
activities from 1997 through 2000 will be approximately $700,000. External costs
incurred through  September 30, 1998 were  approximately  $145,000 and primarily
related to computer  software.  It is  anticipated  that the remaining year 2000
costs will relate to computer  software,  computer hardware and consulting fees.
The Company does not  separately  track internal costs relating to the year 2000
and they are not included in the  Company's  estimate of year 2000 costs.  These
costs do not include  estimates for potential  litigation,  which at the present
time is not viewed as a significant risk.

The Company  reviews and updates data for costs  incurred and  forecasted  costs
each  quarter.  These  costs are based on  management's  estimates,  which  were
determined  based on  assumptions  of future  events,  some within the Company's
control,  but some outside the Company's control.  Management's  estimate of the
costs and  completion  dates are  dependent  on various  factors  including  the
availability  of  skilled  resources  and the  ability  to locate and modify all
relevant software code. However, there can be no assurance that these costs will
not be greater than anticipated,  or that corrective  actions undertaken will be
completed before any year 2000 problems could occur.

For additional  information  regarding the risks  associated  with the Company's
compliance  with  year  2000,  see  "Risk  Factors-Year  2000"  in Item 1 of the
Company's Form 10-K for the year ended March 31, 1998.

     Euro  Conversion.  The Company is assessing the  potential  impact that may
result from the euro  conversion.  The Company is assessing the potential impact
from the euro  conversion  in a number of areas,  including the  following:  (1)
accounting and tax; (2) management  information  systems required to accommodate
euro-denominated  transactions;  (3) the impact on currency  exchange  costs and
currency exchange rate risk; and (4) the impact on existing contracts.

Since the  Company is still in its  assessment  phase,  the  Company  cannot yet
predict the anticipated impact of the euro conversion on the Company.

     Dividend Policy.  The Company is dedicated to promoting  shareholder  value
through   long-term   profitability  and  growth  and  believes  that  continued
investments in future product  development  are essential to this goal. For this
reason, it has been the Company's policy to not pay cash dividends.

<PAGE>

Forward-Looking Statements

     This quarterly report contains certain "forward-looking  statements" within
the  meaning of Section  27A of the  Securities  Act of 1933,  as  amended,  and
Section 21E of the Securities Exchange Act of 1934, as amended,  which represent
the Company's expectations or beliefs, including, but not limited to, statements
concerning  industry  performance,   the  Company's   operations,   performance,
financial condition,  growth and acquisition  strategies,  margins and growth in
sales of the Company's products.  For this purpose,  any statements contained in
this quarterly  report that are not statements of historical  fact may be deemed
to be  forward-looking  statements.  Without  limiting  the  generality  of  the
foregoing,   words  such  as  "may,"  "will,"   "expect,"   "believe,"   "plan,"
"anticipate," "intend," "could," "estimate," "continue," "goal" or "strategy" or
the negative or other variations thereof or comparable  terminology are intended
to identify forward-looking statements. These statements by their nature involve
substantial risks and  uncertainties,  certain of which are beyond the Company's
control,  and actual  results may differ  materially  depending  on a variety of
important  factors,  including those described  previously in the "Risk Factors"
section of the Company's 1998 Form 10-K for the year ended March 31, 1998.

<PAGE>
                         PART II OTHER INFORMATION

Item 5.  Other Information

     A.   Shareholder  Proposals - Deadline for Inclusion in Proxy  Materials As
          set forth in the Company's Proxy Statement for the 1998 Annual Meeting
          of Stockholders, any proposal by a stockholder of the Company intended
          to be presented  at the 1999 Annual  Meeting of  Stockholders  must be
          received by the Company on or before  April 29, 1999 to be included in
          the proxy materials of the Company relating to such meeting.

     B.   Shareholder  Proposals - Discretionary Voting of Proxies In accordance
          with recent amendments to Rule 14a-4 under the Securities Exchange Act
          of 1934,  if notice of a  proposal  by a  shareholder  of the  Company
          intended to be presented at the 1999 Annual Meeting of Shareholders is
          received by the Company  after June 14, 1999,  the persons  authorized
          under the  Company's  management  proxies may  exercise  discretionary
          authority to vote or act on such proposal if the proposal is raised at
          the 1999 Annual Meeting of Shareholders.



Item 6.  Exhibits and Reports for Form 8-K.

         A. Exhibits

            See Exhibit Index

         B. Reports on Form 8-K

         No reports on Form 8-K were filed during the quarter.


<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 thereunto duly authorized.

                                          DETECTION SYSTEMS, INC.
                                          Registrant

DATE: November 16, 1998                   By: /s/ Karl H. Kostusiak
                                          Karl H. Kostusiak, President


                                          By: /s/ Frank J. Ryan
                                          Frank J. Ryan, Vice President,
                                          Secretary and Treasurer
                                          (Principal Financial Officer)


                                          By: /s/ Christopher P. Gerace
                                          Christopher P. Gerace
                                          Chief Accounting Officer
                                          (Principal Accounting Officer)

<PAGE>
                               EXHIBIT INDEX
<TABLE>
<S>        <C>                           <C>    
Item
No.                  Exhibits                         Location

3(a)       Detection Systems, Inc.       Included as Exhibit 3 of this
           Certificate of                Quarterly Report on Form 10-Q
           Incorporation as amended

3(b)       Detection Systems, Inc.       Incorporated by reference to
           By-Laws as amended            Exhibit 3(b) of the Company's 1997
                                         Annual Report on Form 10-K

10(a)      Medical reimbursement plan    Incorporated by reference to
                                         Exhibit 10(b) of the Company's
                                         1997 Annual Report on Form 10-K

10(b)      Employee stock purchase plan  Incorporated by reference to
                                         Exhibit 10 of the Company's 1994
                                         Annual Report on Form 10-K

10(c)      Fleet Amended & Restated      Included as Exhibit 10(c) of this
           Credit Facility Agreement     Quarterly Report on Form 10-Q
           dated September 30, 1998


10(d)      Deferred Compensation Plan    Incorporation by reference to
           and Deferred Bonus Plan.      Exhibit 10(c) to the Company's
                                         Quarterly Report on Form 10-Q, for
                                         the quarter ended 12/31/97

10(e)      1992 Restated Stock Option    Incorporated by reference to
           Plan                          Exhibit 22 of the Company's 1995
                                         Annual Report on Form 10-K
                                          
10(f)      1997 Stock Option Plan        Incorporated by reference to
                                         Exhibit 10(o)of the Company's
                                         Registration Statement on Form S-2
                                         (No. 333-31951) filed on 7/24/97

10(g)      Executive Officer Cash        Incorporated by reference to
           Bonus Plan                    Exhibit 10(g) of the Company's
                                         1998 Annual Report on Form 10-K

10(h)      Executive employment          Incorporated by reference to
           contract with Karl H.         Exhibit 10(h) of the Company's
           Kostusiak.                    1998 Annual Report on Form 10-K

10(i)      Amendment #1 to executive     Included as Exhibit 10(i) of this
           employment contract with      Quarterly Report on Form 10-Q
           Karl H. Kostusiak

10(j)      Executive employment          Included as Exhibit 10(j) of this
           contract with David B.        Quarterly Report on Form 10-Q
           Lederer.

10(k)      Executive employment          Incorporated by reference to
           contract with Lawrence R.     Exhibit 10 of the Company's 1995
           Tracy.                        Annual Report on Form 10-K

10(l)      Stock Purchase Agreements     Incorporated by reference to
           with Karl H. Kostusiak and    Exhibit 10(l) of the Company's
           David B. Lederer              1997 Annual Report on Form 10-K

10(m)      Non-Employee Director Stock   Included as Exhibit 10(m) of this
           Option Plan                   Quarterly Report on Form 10-Q

11         Statement re: Computation     Included as Exhibit 11 of this
           of Per Share Earnings         Quarterly Report on Form 10-Q

24         Powers of Attorney            Incorporated by reference to
                                         Exhibit 24 of the Company's 1998
                                         Annual Report on Form 10-K

27         Financial Data Schedule       Included as Exhibit 27 of this
                                         Quarterly Report on Form 10-Q
<PAGE>
</TABLE>

                          CERTIFICATE OF INCORPORATION

                                       OF

                             DETECTION SYSTEMS, INC.

                          [as amended through 9/17/98]

                        Under Section 402 of the Business
                             Corporation Law of the
                                State of New York


            First:  The name of the corporation is:

                             DETECTION SYSTEMS, INC.

            Second: The purposes for which it is formed are as follows:

                    To  design,  develop,   manufacture,   assemble,  fabricate,
                    import,  lease,  market,  purchase or otherwise  acquire and
                    generally  to trade and deal in and with,  as  principal  or
                    agent,  at  wholesale,  retail,  on commission or otherwise,
                    materials,   components   and   devices  of  a   mechanical,
                    electrical,  optical or chemical nature for use in detection
                    systems, signal systems and other systems.

                    To  acquire  by  purchase,  assignment,  grant,  license  or
                    otherwise,  to apply  for,  secure,  lease or in any  manner
                    obtain, to develop, hold, own, use, exploit,  operate, enjoy
                    and introduce,  to sell, assign,  lease,  mortgage,  pledge,
                    grant  licenses  and rights of all kinds in  respect  of, or
                    otherwise  dispose of, and generally to deal in and with and
                    turn to account for any or all  purposes,  either for itself
                    or as nominee or agent for others:

                    (1) Any and all inventions, devices, processes,  discoveries
                    and formulae, and improvements and modifications thereof and
                    rights and interests therein;

                    (2) Any and all letters patent or  applications  for letters
                    patent  of the  United  States  of  America  or of any other
                    country,  state,  locality  or  authority,  and  any and all
                    rights,  interests  and  privileges  connected  therewith or
                    incidental or appertaining thereto;

                    (3) Any and all  copyrights  granted by the United States of
                    America or any other country,  state, locality or authority,
                    and any and all rights,  interests and privileges  connected
                    therewith or incidental or appertaining thereto.

                To purchase or otherwise acquire,  hold, own, sell, lease or
                otherwise dispose of real property,  improved or unimproved,
                and personal  property,  tangible or intangible,  including,
                without  limitation,  goods,  wares and merchandise of every
                description  and  the  securities  and  obligations  of  any
                issuer, whether or not incorporated.

     To  do  all  and  everything   necessary,   suitable,  or  proper  for  the
accomplishment  of any of the purposes,  the attainment of any of the objects or
the  furtherance of any of the powers  hereinbefore  set forth,  either alone or
connection  with  other  corporations,   firms  or  individuals  and  either  as
principals,  or  agents  and to do  every  other  act or acts,  thing or  things
incidental or appurtenant to or growing out of or connection  with the aforesaid
objects, purposes or powers or any of them.
     The foregoing  enumeration of specific  powers shall not be deemed to limit
or  restrict  in any  manner  the  general  powers of the  corporation,  and the
enjoyment  and  exercise  thereof,  as conferred by the laws of the State of New
York  upon   corporations   organized  under  the  provisions  of  the  Business
Corporation Law.
     Third: The office of the corporation  within the State of New York is to be
located in the City of Rochester, County of Monroe.
<PAGE>
     Fourth:  The aggregate  number of shares which the  Corporation  shall have
authority to issue is twenty-four  million  (24,000,000) common shares, with par
value of Five Cents ($.05) per share.  
     Fifth: No holder of shares of the Corporation of any class now or hereafter
authorized,  shall have any  preferential or preemptive  right to subscribe for,
purchase or receive any shares of the corporation of any class, now or hereafter
authorized,  or any  options  or  warrants  for such  shares,  or any  rights to
subscribe to or purchase  such shares,  or any  securities  convertible  into or
exchangeable for such shares,  which may at any time be issued,  sold or offered
for sale by the Corporation.
     Sixth: The Secretary of State is designated the agent of the Corporation
upon whom process against the Corporation may be served. The post office address
to which the Secretary of State shall mail a copy of any process against the
Corporation so served upon him is 130 Perinton Parkway, Fairport, New York
14450.


               1998 AMENDED AND RESTATED CREDIT FACILITY AGREEMENT

     THIS AGREEMENT is made as of the 30th day of September,  1998, by and among
DETECTION SYSTEMS, INC., a corporation formed under the laws of the State of New
York  with  offices  at  130  Perinton   Parkway,   Fairport,   New  York  14450
("Detection"), RADIONICS, INC., a corporation formed under the laws of the State
of California  with offices at 1800 Abbott  Street,  Salinas,  California  93901
("Radionics"),  and FLEET NATIONAL  BANK, a national  banking  association  with
offices at One East  Avenue,  Rochester,  New York 14638 (as  successor to Fleet
Bank, "Bank").

     This Agreement amends, clarifies and supersedes in its entirety the Amended
and Restated Credit Facility Agreement among the parties to this Agreement dated
as of June 24, 1997.

     The parties hereby agree as follows:


ARTICLE 1 - DEFINITIONS

     1.1 The following terms shall have the following meanings unless otherwise
expressly stated herein:

          "Affiliate"  shall mean any entity which  directly or  indirectly,  or
     through  one or more  intermediaries,  Controls or is  Controlled  By or is
     Under Common Control with the Borrower.

          "Agency"  shall  mean the  County  of  Monroe  Industrial  Development
     Agency, a public benefit  corporation formed under the laws of the State of
     New York.

          "Applicable Base Rate Margin" shall mean the following amounts for the
     following  respective  ratios of Funded Debt to EBITDA,  calculated for the
     Borrower and Subsidiaries on a consolidated  basis and without  duplication
     in accordance with GAAP:

                        Ratio             Margin (Basis Points)
                  3 to 1 or greater               37.5
                  2 to 1 or greater and
                        less than 3 to 1          12.5
                  Less than 2 to 1                 0.0

     The Applicable  Base Rate Margin shall be adjusted at the beginning of each
     three month  period  commencing  either  March 1, July 1,  September 1, and
     December 1  respectively,  and shall be  established  for that period based
     upon  the  average  rolling  ratios  shown  by  the  Borrower's   financial
     statements for the four fiscal  quarters ending on the most recent December
     31, March 31, June 30, or September 30 respectively.
<PAGE>
          "Applicable  LIBOR Margin"  shall mean the  following  amounts for the
     following  respective  ratios of Funded Debt to EBITDA,  calculated for the
     Borrower and Subsidiaries on a consolidated  basis and without  duplication
     in accordance with GAAP:

                        Ratio             Margin (Basis Points)
                  3 to 1 or greater              155.50
                  2 to 1 or greater and
                        less than 3 to 1         118.75
                  1.75 to 1 or greater and
                        less than 2 to 1          90.00
                  Less than 1.75 to 1             70.00

          The Applicable LIBOR Margin shall be adjusted at the beginning of each
     three month  period  commencing  either  March 1, July 1,  September 1, and
     December 1  respectively,  and shall be  established  for that period based
     upon  the  average  rolling  ratios  shown  by  the  Borrower's   financial
     statements for the four fiscal  quarters ending on the most recent December
     31, March 31, June 30, or September 30 respectively.

          "Bank" shall mean Fleet National Bank (as successor to Fleet Bank) and
     its successors, legal representatives, and assigns.

          "Base Rate"  shall mean the higher of the Federal  Funds Rate plus 100
     basis points, or the Prime Rate.

          "Borrower"  shall mean Detection and Radionics,  collectively and both
     of them,  and  their  respective  successors,  legal  representatives,  and
     assigns.

          "Break  Costs"  shall  mean an  amount  equal to the  amount  (if any)
     required  to  compensate  the Bank  for any  additional  losses  (including
     without  limitation  any loss,  cost, or expense  incurred by reason of the
     liquidation  or  reemployment  of deposits or funds acquired by the Bank to
     fund or maintain the Obligations  prepaid),  costs, and expenses (including
     without  limitation  penalties)  the  Bank  incurs  as a  result  of  or in
     connection  with such  prepayment.  If by reason of an Event of Default the
     Bank elects to declare the  Obligations to be immediately  due and payable,
     then any Break Costs with respect to the  Obligations  shall become due and
     payable in the same  manner as though  Borrower  had  exercised  a right of
     prepayment.

          "Business Day" shall mean, in respect of any date that is specified in
     this Agreement to be subject to adjustment in accordance  with the Modified
     Following  Business Day Convention,  a day on which commercial banks settle
     payments  in New  York or,  if the  payment  obligation  is  calculated  by
     reference to any LIBOR Rate, London, England.
<PAGE>
          "Controls"  (including  the terms  "Controlled  By" or  "Under  Common
     Control")  shall mean but not be limited to the  ownership  of  twenty-five
     percent(25%)or  more of the  outstanding  shares  of  capital  stock of any
     corporation  having voting power for the election of directors,  whether or
     not at the same time stock of any other  class or classes has or might have
     voting power by reason of the happening of any contingency, or ownership of
     twenty-five  percent (25%) or more of any interest in any  partnership,  or
     any other  interest  by reason of which a  controlling  influence  over the
     affairs of the entity may be exercised.

          "Current  Assets" shall mean all assets  treated as current  assets in
     accordance with GAAP.

          "Current  Liabilities"  shall mean treated as current  liabilities  in
     accordance with GAAP,  including without limitation all obligations payable
     on demand or within one year after the applicable  measurement date as well
     as installment,  reimbursement, or sinking fund payments payable within one
     year  after  the  applicable  measurement  date,  but  excluding  any  such
     liabilities  which are renewable or extendable at the option of the obligor
     to a date more than one year after the applicable measurement date. Current
     Liabilities  shall not include  obligations to repurchase  Borrower  shares
     pursuant  to  the  Stock  Purchase  Agreement  dated  May 7,  1997  between
     Detection Systems, Inc. and Numerix Corp.

          "Current   Ratio"  shall  mean  Current  Assets  compared  to  Current
     Liabilities.

          "Debt" for any person or entity  shall mean (i)  indebtedness  of such
     person or entity for borrowed  money,  (ii)  obligations  of such person or
     entity for the  deferred  purchase  price of property  or services  (except
     trade  payables  incurred  in  the  ordinary  course  of  business),  (iii)
     capitalized  or  capitalizable  obligations  of such  person or entity with
     respect to leases,  (iv) the amount available for drawing under outstanding
     standby  letters of credit  issued for the account of such person or entity
     and the amount of other off-balance sheet obligations or liabilities,  each
     to the extent not otherwise treated separately as Debt, (v) all obligations
     endorsed  (other than for collection in the ordinary course of business) or
     guaranteed  by such person or entity  directly or  indirectly in any manner
     including without  limitation  contingent  obligations to purchase,  pay or
     supply  funds to any  person or entity to assure a creditor  against  loss,
     (vi)  obligations  of  such  person  or  entity  arising  under  acceptance
     facilities, or bills, notes, or similar instruments,  and (vii) obligations
     secured by a lien, security interest,  or other arrangement for the purpose
     of security on property  owned by such person or entity  whether or not the
     underlying  obligations  have been  assumed by such person or entity.  Debt
     shall not include obligations to repurchase Borrower shares pursuant to the
     Stock Purchase Agreement dated May 7, 1997 between Detection Systems,  Inc.
     and Numerix Corp.
<PAGE>
          "Distributions"  shall mean (i) dividends,  payments, or distributions
     of any kind in respect of the capital  stock,  securities  or other  equity
     interests  or rights to acquire  such equity  interests  of the  applicable
     entity (except  distributions in the form of such stock, equity securities,
     equity  interests,  or rights to acquire  equity  interests  or assets of a
     business  being   acquired),   and  (ii)   repurchases,   redemptions,   or
     acquisitions  of capital stock,  securities,  or other equity  interests or
     rights to acquire such equity interests of the Borrower or any Affilate.

          "Domestic Subsidiaries" shall mean consolidated subsidiaries organized
     under the laws of the United  States of America or any state,  territory or
     instrumentality  thereof that are wholly  owned by Detection or  Radionics.
     All Domestic  Subsidiaries  are required to (a) be Guarantors,  (b) provide
     the Bank with security  interests in all of their assets  unless  otherwise
     agreed by the Bank, and (c) except for intercompany  transactions  with the
     Borrower and other Subsidiaries, themselves comply in all respects with the
     requirements  set  forth  in  Section  8.13,  and  9.10,  and with the same
     requirements  as are  imposed  upon  the  Borrower  in  Article  11 of this
     Agreement.

          "EBITDA" shall mean, for any period and determined in accordance  with
     GAAP, net operating  income  (calculated  before Interest  Expense,  taxes,
     extraordinary  and unusual items, and income or loss attributable to equity
     in Affiliates)  plus  depreciation  and  amortization  of intangibles  less
     Distributions.

          "Environment"  means any water  including  but not  limited to surface
     water and ground water or water vapor;  any land  including land surface or
     subsurface;  stream sediments;  air; fish; wildlife;  plants; and all other
     natural resources or environmental media.

          "Environmental Laws" means all federal, state and local environmental,
     land use,  zoning,  health,  chemical  use,  safety  and  sanitation  laws,
     statutes,  ordinances,   regulations,  codes  and  rules  relating  to  the
     protection of the Environment and/or governing the use, storage, treatment,
     generation, transportation, processing, handling, production or disposal of
     Hazardous  Substances  and  the  regulations,  rules,  ordinances,  bylaws,
     policies, guidelines,  procedures,  interpretations,  decisions, orders and
     directives  of  federal,   state  and  local   governmental   agencies  and
     authorities with respect thereto.

          "Environmental  Permits"  means  all  licenses,   permits,  approvals,
     authorizations,  consents  or  registrations  required  by  any  applicable
     Environmental Laws and all applicable judicial and administrative orders in
     connection with ownership,  lease, purchase,  transfer, closure, use and/or
     operation  of the  Improvements  and/or as may be required for the storage,
     treatment, generation, transportation,  processing, handling, production or
     disposal of Hazardous Substances.

          "Environmental Report" means written reports, if any, prepared for the
     Bank by an environmental consulting or environmental engineering firm.

          "ERISA"  shall mean the  Employee  Retirement  Income  Security Act of
     1974, as amended.

          "Event of Default" shall mean the occurrence of any event described in
     Article 12 hereof.
<PAGE>
          "Federal  Funds  Rate"  shall  mean,  for any  period,  a  fluctuating
     interest  rate per  annum  equal  for each day  during  such  period to the
     weighted average of the rates on overnight federal funds  transactions with
     members of the Federal Reserve System arranged by Federal funds brokers, as
     published  for such day (or if such day is not a Business Day, for the next
     preceding  Business  Day) by the Federal  Reserve Bank of New York,  or, if
     such rate is not so  published  for any day which is a  Business  Day,  the
     average of the quotations for such day on such transactions received by the
     Bank from three Federal funds  brokers of recognized  standing  selected by
     it.

          "Fee Rate"  shall mean the rate used in  computing  the unused fee and
     computed as described in Section 2.7 of this Agreement.

          "First Tier Foreign  Subsidiary"  shall mean a Foreign  Subsidiary the
     stock of which is owned directly by the Borrower or a Domestic Subsidiary.

          "Fixed  Charges"  shall mean for the applicable  period,  (i) Interest
     Expense, (ii) provision for taxes, (iii) capital expenditures not funded by
     Funded Debt or out of  additional  paid in capital,  and (iv)  principal or
     other payments due with respect to Debt which are Current Liabilities.

          "Foreign  Subsidiary"  shall mean any Subsidiary formed under the laws
     of a  jurisdiction  other than the  United  States of America or any state,
     territory or instrumentality thereof.

          "Funded Debt" shall mean all Debt that is not a Current Liability.

          "GAAP"  shall mean  generally  accepted  accounting  principles  as in
     effect from time to time in the United States of America.

          "Guarantors"  shall mean all persons or entities that have jointly and
     severally  guaranteed all of the  Obligations in form  satisfactory  to the
     Bank, including without limitation,  all Domestic Subsidiaries.  Unless the
     Bank and the Borrower  otherwise  agree in writing,  no Foreign  Subsidiary
     shall be a Guarantor.

          "Hazardous  Substances"  means,  without  limitation,  any explosives,
     radon, radioactive materials,  asbestos, urea formaldehyde foam insulation,
     polychlorinated  biphenyls,  petroleum  and  petroleum  products,  methane,
     hazardous  materials,  hazardous wastes,  hazardous or toxic substances and
     any other material  defined as a hazardous  substance in the  Comprehensive
     Environmental Response, Compensation and Liability Act of 1980, as amended,
     42 U.S.C.  Sections 9601, et. seq.; the Hazardous Materials  Transportation
     Act,  as  amended,  49  U.S.C.   Sections  1801,  et.  seq.;  the  Resource
     Conservation  and Recovery Act, as amended,  42 U.S.C.  Sections  6901, et.
     seq.; Articles 15 and 27 of the New York State  Environmental  Conservation
     Law or any other federal, state, or local law, regulation, rule, ordinance,
     bylaw, policy, guideline,  procedure,  interpretation,  decision, order, or
     directive,  whether existing as of the date hereof,  previously enforced or
     subsequently enacted.  "Improvements" shall mean any real property owned or
     used by the Borrower.
<PAGE>
          "Increased  Cost"  shall mean any  additional  amounts  sufficient  to
     compensate  the Bank and any  assignee or  participant  of the Bank for any
     increased  costs of funding or maintaining  the  Obligations as a result of
     any law (other than  changes in tax laws  imposed on the overall net income
     or  similar  measure of  profitability  of the Bank) or  guideline  adopted
     pursuant to or arising  out of the July 1988 report of the Basle  Committee
     on Banking  Regulations and Supervisory  Practices entitled  "International
     Convergence of Capital Measurement and Capital Standards",  or the adoption
     after the date of this Agreement of any law or guideline  regarding capital
     adequacy, or any change in any of the foregoing or in the interpretation or
     administration  of any  of the  foregoing  by any  governmental  authority,
     central  bank or  comparable  agency  charged  with the  interpretation  or
     administration  thereof,  or compliance  by the Bank or the Bank's  holding
     company (or any assignee or participant of the Bank or any of their holding
     companies),  with any  request  or  directive  regarding  capital  adequacy
     (whether  or not  having the force of law) of any such  authority,  central
     bank or comparable  agency,  which has or would have the effect of reducing
     the rate of return on the Bank's  capital  or on the  capital of the Bank's
     holding  company (or the capital of any assignee or participant of the Bank
     or  any  of  their  holding  companies)  as a  direct  consequence  of  the
     transactions  contemplated by this Agreement and all related  documents and
     agreements,  the  existence  of the Bank's  commitments  hereunder,  or the
     Obligations  to a level  below that  which the Bank or the  Bank's  holding
     company (or any assignee or participant of the Bank or any of their holding
     companies) would have achieved but for such adoption,  change or compliance
     (taking into consideration the Bank's, assignee's or participant's policies
     on capital adequacy).

          "Interest  Expense"  shall mean, for the  applicable  period,  for the
     Borrower  and  Subsidiaries  determined  on a  consolidated  basis  without
     duplication,  all interest paid, capitalized,  or accrued, and amortization
     of debt discount with respect to all Debt less all related  interest income
     during  such  period and  determined  after  giving  effect to the net cost
     associated with financial  arrangements of any kind made to protect against
     fluctuations  in  interest  rates  such as  interest  rate swap  contracts,
     interest rate cap agreements, and the like.

          "LIBOR" shall mean the rate per annum (rounded  upward,  if necessary,
     to the  nearest  1/32 of one  percent)  as  determined  on the basis of the
     offered rates for deposits in United States  Dollars,  for a period of time
     comparable to the  applicable  LIBOR  Interest  Period which appears on the
     Telerate  Page 3750 as of 11:00  a.m.,  London  time on the day that is two
     London  Banking  Days  preceding  the  first  day of the  applicable  LIBOR
     Interest Period (the "Interest Setting Date");  provided,  however,  if the
     rate  described  above  does  not  appear  on the  Telerate  System  on any
     applicable Interest Setting Date, the LIBOR rate shall be the rate (rounded
     upwards as described  above,  if  necessary)  for deposits in United States
     Dollars for a the applicable Interest Period on the Reuters Page "LIBO" (or
     such  other  page as may  replace  the LIBO  Page on that  service  for the
     purpose of displaying  such rates),  as of 11:00 a.m.  (London Time) on the
     day that is two (2)  London  Banking  Days prior to the  beginning  of such
     LIBOR  Interest  Period.  If both  the  Telerate  and  Reuters  system  are
     unavailable, then the rate for that date will be determined on the basis of
     the offered  rates for  deposits in United  States  Dollars for a period of
     time  comparable to the applicable  LIBOR Interest Period which are offered
     by four major banks in the London interbank  market at approximately  11:00
     a.m.  (London  Time),  on the  day  that  is two (2)  London  Banking  Days
     preceding the first day of such LIBOR Interest Period. The principal London
     office of each of the four major  London banks will be requested to provide
     a quotation of its United States Dollar  deposit  offered rate. If at least
     two such  quotations  are  provided,  the rate  for that  date  will be the
     arithmetic  mean of the  quotations.  If  fewer  than  two  quotations  are
     provided as  requested,  the rate for that date will be  determined  on the
     basis of the rates  quoted  for loans in United  States  Dollars to leading
     European  banks for a period of time  comparable  to the  applicable  LIBOR
     Interest  Period  offered by major banks in New York City at  approximately
     11:00  a.m.  New York City time on the day that is two (2)  London  Banking
     Days  preceding the first day of such LIBOR Interest  Period.  In the event
     that the Bank is unable to obtain any such quotation as provided  above, it
     will be  deemed  that  LIBOR  for  the  LIBOR  Interest  Period  cannot  be
     determined.
<PAGE>
          In the event that LIBOR cannot be  determined,  or there is any change
     in any law or  application  thereof that makes it unlawful,  or any central
     bank or other governmental  authority asserts that it is unlawful,  for the
     Bank to hold  obligations  if the rate is determined  with reference to the
     LIBOR  (collectively,  a "LIBOR End Date"),  then  borrowings with interest
     based upon the LIBOR Rate shall not be available after the LIBOR End Date.

          "LIBOR   Interest   Period"  shall  mean  any  particular   one-month,
     three-month,  or six-month  period  during which an  applicable  LIBOR Rate
     shall be in effect.

          "LIBOR Rate" shall mean, with respect to any interest rate period, the
     rate per anum equal to LIBOR,  further  adjusted to reflect  any  Increased
     Cost.

          "Loan   Documents"  shall  mean  all  notes,   instruments,   security
     agreements,   assignments,   pledges,  mortgages,   guarantees,  and  other
     documents and agreements of any kind or nature related to this Agreement or
     the Obligations.

          "Modified Following Business Day Convention" shall mean the convention
     for adjusting any relevant date if it would otherwise fall on a day that is
     not a  Business  Day.  Terms,  when  used in  conjunction  with  the  term,
     "Modified  Following Business Day Convention",  and a date, shall mean that
     an adjustment  will be made if that date would otherwise fall on a day that
     is not a Business Day so that the date will be the first following day that
     is a Business Day.
<PAGE>
          "Mortgage"  shall mean the  mortgage  described in Section 5.5 of this
     Agreement.

          "Mortgage Loan" shall mean the mortgage loan described in Article 3 of
     this Agreement.

          "Mortgage Loan Note" shall mean the note  evidencing  the  Obligations
     related to the Mortgage Loan as described in Section 3.2 of this Agreement.

          "Mortgaged  Property" shall mean the property and improvements covered
     by and more specifically described in the Mortgage.

          "Obligations" shall include all of the Borrower's obligations owing to
     the  Bank  or any  participant  or  assignee  of the  Bank,  including  all
     obligations related to this Agreement of any kind or nature, arising now or
     in the future, including without limitation obligations under the Revolving
     Line Note, the Mortgage Loan Note, and the Term Loan Note.

          "Prime  Rate"  shall mean the  variable  per annum rate of interest so
     designated  from time to time by the Bank as its prime rate. The Prime Rate
     is a reference rate and does not  necessarily  represent the lowest or best
     rate being charged to any customer.

          "Rate  Change  Date"  shall  mean  the  first  day of each  one-month,
     three-month, or six-month period for which any LIBOR Rate applies.

          "Release"  has the  same  meaning  as given  to that  term in  Section
     101(22)  of the  Comprehensive  Environmental  Response,  Compensation  and
     Liability  Act of 1980, as amended,  42 U.S.C.  Section  9601(22),  and the
     regulations promulgated thereunder.

          "Revolving  Line" shall mean the revolving line of credit  established
     pursuant to Section 2.1 of this Agreement.

          "Revolving  Line  Note"  shall  mean the note  evidencing  Obligations
     related  to the  Revolving  Line  as  described  in  Section  2.2  of  this
     Agreement.

          "Revolving  Line  Termination  Date"  shall mean the date on which the
     Revolving Line terminates as described in Section 2.5 of this Agreement.

          "Subsidiary"  shall mean for any person or entity any  corporation  or
     other business organization of which at least a majority of the securities,
     equity,  or other ownership  interests having absolute or contingent voting
     power are directly or indirectly owned by such person or entity.

          "Tangible  Assets"  shall  mean  total  assets,   after  deduction  of
     depreciation,  depletion,  and reserves,  but  excluding  accounts from and
     other obligations  payable by officers and Affiliates and further excluding
     all assets  required to be classified  as  intangible  assets in accordance
     with GAAP (including without limitation  organizational expense, good will,
     unamortized  debt  discount,   research  and  development  costs,  patents,
     trademarks, copyrights, other intellectual property rights, franchises, and
     deferred assets).
<PAGE>
          "Tangible Net Worth" shall mean Tangible Assets less Total Liabilities
     as determined by GAAP.

          "Term Loan" shall mean the Term Loan  described  in Article 3A of this
     Agreement.

          "Term  Loan Note"  shall  mean the Term Loan Note the note  evidencing
     Obligations  related to the Term Loan as  described in Section 3A.2 of this
     Agreement.

          "Total Liabilities" shall mean the sum of all liabilities shown on the
     balance sheet as of the  applicable  date of  determination,  determined in
     accordance with GAAP.


ARTICLE 2 - REVOLVING LINE

          2.1  Revolving  Line.  Subject  to the  terms and  conditions  of this
     Agreement,  the Bank hereby  establishes  for the benefit of the Borrower a
     revolving  line of  credit in the  maximum  principal  amount of  Seventeen
     Million Dollars ($17,000,000)  outstanding at any one time. The proceeds of
     the Revolving Line shall be used for Borrower's  working capital  purposes.
     Subject to the terms of this  Agreement,  the  Borrower (or either of them)
     may borrow,  repay,  and reborrow  under the Revolving  Line so long as the
     aggregate principal amount outstanding at any time to the Borrower does not
     exceed $17,000,000. Each borrowing request must be of at least $250,000.

          2.2 Revolving Line Note.  The Borrower  shall  execute,  together with
     this Agreement, a note evidencing Obligations related to the Revolving Line
     in the form of Exhibit A attached hereto and made a part hereof.

          2.3 Interest  Rate and  Payments.  All  outstanding  amounts under the
     Revolving Line, except as specifically provided herein, shall bear interest
     until  paid in  full  (including  without  limitation  after  acceleration,
     maturity  and  judgment)  at the Base  Rate plus the  Applicable  Base Rate
     Margin.  Changes in the rate of interest  applicable to the Revolving  Line
     Note shall become effective automatically and without notice at the time of
     changes in the Base Rate.

          The Borrower, however, at least three Business Days prior to each Rate
     Change  Date may notify the Bank of its  election  to have a portion of the
     outstanding  principal  amount under the  Revolving  Line (which must be at
     least  $1,000,000 and must be an increment of $100,000) bear interest for a
     one-month,  three-month, or six month period commencing on such Rate Change
     Date at the LIBOR Rate plus the Applicable LIBOR Margin.
<PAGE>
          All  computations  of  interest  shall be made on the basis of a three
     hundred sixty (360) day year and the actual number of days elapsed.

          2.4  Payments.  Payments of all accrued  interest  under the Revolving
     Line Note shall be due and payable on the first day of each month.

          All remaining  outstanding principal and accrued interest shall be due
     and payable in full on the Revolving Line Termination Date.

          2.5 Revolving Line Termination. Unless extended in writing by the Bank
     on terms and  conditions  then  acceptable to the Bank,  the Revolving Line
     will  terminate on, the earlier of (i) July 31, 2000,  and (ii) the date of
     an Event of Default.

          2.6 Break Costs.  Any payment of any principal  outstanding  under the
     Revolving Line Note which  principal  amount is then bearing  interest at a
     rate based upon the LIBOR  Rate  shall be  accompanied  by a payment of all
     Break Costs  unless such payment is on the Rate Change Date  applicable  to
     that particular principal amount outstanding.

          2.7  Unused  Fee.  The  Borrower  shall pay to the Bank an unused  fee
     computed at the following applicable Fee Rate for the respective applicable
     ratio  of  Funded  Debt  to  EBITDA,   calculated   for  the  Borrower  and
     Subsidiaries on a consolidated basis and without  duplication in accordance
     with GAAP:

                        Ratio             Fee Rate (Basis Points)
                  3 to 1 or greater              18.87
                  2 to 1 or greater and
                        less than 3 to 1         18.75
                  Less than 2 to 1               12.50


          Each Fee Rate shall be adjusted at the  beginning  of each three month
     period  commencing  either  March 1, July 1,  September  1, and  December 1
     respectively,  and shall be  established  for that  period  based  upon the
     average rolling ratios shown by the Borrower's financial statements for the
     four fiscal  quarters ending on the most recent December 31, March 31, June
     30, or September 30 respectively.

          The unused fee shall be computed as  follows:  $17,000,000,  minus the
     average daily  outstanding  principal  balance of the Revolving Line, times
     the Fee Rate per annum.  At the end of each fiscal  quarter,  the Bank will
     bill the Borrower for the unused fee.

          2.8  Letters of Credit.  Subject to the terms and  conditions  of this
     Agreement,  the Bank will make letters of credit  available for the account
     of the  Borrower.  The  aggregate  amount  available  for drawing under all
     letters of credit  outstanding shall reduce,  dollar for dollar, the amount
     then available for advances under the Revolving Line. The letters of credit
     shall be in form  satisfactory to the Bank and the expiration dates thereof
     shall not be later than the Revolving Line Termination Date.
<PAGE>
          The  Borrower  will  pay  the  Bank's   customary   letter  of  credit
     commissions in connection with each letter of credit.

          The  Borrower,  if requested by the Bank,  will execute  reimbursement
     agreements in form  satisfactory  to the Bank,  documenting its Obligations
     with  respect  to the Letter of Credit.  All  drawings  under any letter of
     credit shall be treated as immediate advances under the Revolving Line.

          2.9 Facility  Fee.  The Borrower  shall pay to the Bank a fee equal to
     US$20,400 on the date hereof in  connection  with the renewed  availability
     under the Revolving Line.


ARTICLE 3 - MORTGAGE LOAN

          3.1  Mortgage  Loan.  Subject  to the  terms  and  conditions  of this
     Agreement,  the Bank  shall make a mortgage  loan to the  Detection  in the
     original  principal  amount of Three Million Four Hundred  Thousand Dollars
     ($3,400,000).  The proceeds of the  Mortgage  Loan shall be used to repay a
     portion of "Bridge Loan"  Obligations  to the Bank as defined in the Credit
     Facility Agreement among the Bank and the Borrower dated as of February 12,
     1996.

          3.2 Mortgage Loan Note. The Obligations relating to the Mortgage Loan
     outstanding on the date hereof shall be evidenced by a note dated as of the
     date  hereof  in the form of  Exhibit  B  attached  hereto  and made a part
     hereof.

          3.3 Interest Rate.  Outstanding amounts of the Mortgage Loan except as
     specifically  provided  herein,  shall  bear  interest  until  paid in full
     (including without limitation after acceleration,  maturity or judgment) at
     the Base Rate plus the Applicable Base Rate Margin.  Changes in the rate of
     interest  applicable  to the  Mortgage  Loan Note  shall  become  effective
     automatically and without notice at the time of changes in the Base Rate.

          Detection,  however,  at least three  Business Days prior to each Rate
     Change  Date may notify the Bank of its  election  to have a portion of the
     outstanding  principal  amount  under the  Mortgage  Loan (which must be at
     least  $1,000,000 and must be an increment of $100,000) bear interest for a
     one-month,  three-month, or six month period commencing on such Rate Change
     Date at the LIBOR Rate plus the Applicable LIBOR Margin.

          All  computations  of  interest  shall be made on the basis of a three
     hundred sixty (360) day year and the actual number of days elapsed.

          Detection will make arrangements satisfactory to the Bank, such as the
     purchase of interest  rate caps,  providing  for  protection of at least an
     aggregate of  $11,537,500  of  Obligations  under the Mortgage Loan and the
     Term Loan from interest rate increases.
<PAGE>
          3.4 Payments.  Commencing on October 1, 1998,  payments of all accrued
     interest under the Mortgage Loan Note shall be due and payable on the first
     day of each month.  In addition,  commencing on October 1, 1998,  principal
     payments  of  $20,987.65  each shall be due and payable on the first day of
     each month.

          The  Mortgage  Loan Note  shall be due and  payable in full on May 31,
     2006.

          3.5 Break Costs.  Any payment of any principal  outstanding  under the
     Mortgage Loan Note,  which principal  amount is then bearing  interest at a
     rate based upon the LIBOR Rate,  shall be  accompanied  by a payment of all
     Break Costs  unless such payment is on the Rate Change Date  applicable  to
     that particular principal amount outstanding.


ARTICLE 3A - TERM LOAN

          3A.1 Term Loan. Subject to the terms and conditions of this Agreement,
     the Bank shall make a term loan to the Detection in the principal amount of
     Fourteen  Million Three Hundred Fifty Thousand Dollars  ($14,350,000).  The
     proceeds of the Term Loan shall be used to  refinance  certain  outstanding
     obligations  of the  Borrower  owing to the Bank,  and for working  capital
     purposes.

          3A.2 Term Loan Note.  The Term Loan shall be evidenced by a note dated
     the date  hereof in the form of Exhibit C  attached  hereto and made a part
     hereof.

          3A.3  Interest  Rate.  Outstanding  amounts of the Term Loan except as
     specifically  provided  herein,  shall  bear  interest  until  paid in full
     (including without limitation after acceleration,  maturity or judgment) at
     the Base Rate plus the Applicable Base Rate Margin.  Changes in the rate of
     interest   applicable  to  the  Term  Loan  Note  shall  become   effective
     automatically and without notice at the time of changes in the Base Rate.

          Detection,  however,  at least three  Business Days prior to each Rate
     Change  Date may notify the Bank of its  election  to have a portion of the
     outstanding  principal  amount  under the Term Loan (which must be at least
     $1,000,000  and must be an  increment  of  $100,000)  bear  interest  for a
     one-month,  three-month, or six month period commencing on such Rate Change
     Date at the LIBOR Rate plus the Applicable LIBOR Margin.

          All  computations  of  interest  shall be made on the basis of a three
     hundred sixty (360) day year and the actual number of days elapsed.

          Detection will make arrangements satisfactory to the Bank, such as the
     purchase of interest  rate caps,  providing  for  protection of at least an
     aggregate of  $11,537,500  of  Obligations  under the Mortgage Loan and the
     Term Loan from interest rate increases.

          3A.4 Payments.  Commencing on October 1, 1998, payments of all accrued
     interest under the Term Loan Note shall be due and payable on the first day
     of each month. In addition, commencing on March 1, 2000, principal payments
     of  $217,424.24  each  shall be due and  payable  on the  first day of each
     month.
<PAGE>
      The Term Loan Note shall be due and payable in full on September 30, 2005.

          3A.5 Break Costs. Any payment of any principal  outstanding  under the
     Term Loan Note,  which principal  amount is then bearing interest at a rate
     based upon the LIBOR Rate,  shall be  accompanied by a payment of all Break
     Costs  unless such  payment is on the Rate Change Date  applicable  to that
     particular principal amount outstanding.

          3A.6 Facility  Fee. The Borrower  shall pay to the Bank a fee equal to
     US$17,220 on the date hereof in connection  with the initial advance of the
     Term Loan.

ARTICLE 4 - EXPENSES/DEFAULT RATE INCREASES

          4.1 Administrative Expenses. The Borrower shall pay any fees, expenses
     and disbursements,  including reasonable legal fees, of the Bank related to
     this Agreement, the Obligations,  the perfection of any collateral security
     required  hereunder,  and the transactions  contemplated by this Agreement.
     Such  payments  shall be due from  time to time  upon the Bank  giving  the
     Borrower notice of the amount of such expenses.

          4.2 Collection  Costs.  At the request of the Bank, the Borrower shall
     promptly  pay  any  expenses,   reasonable   attorney's  fees,   costs,  or
     disbursements  in connection  with  administration  of the  Obligations  or
     collection of any of the  Obligations  or  enforcement of any of the Bank's
     rights  hereunder  or under any  note,  security  agreement,  reimbursement
     agreement,  guarantee,  or other agreement related hereto.  This obligation
     shall  survive the payment of any notes  executed  hereunder.  The Bank may
     apply any  payments  of any nature  received  by it first to the payment of
     Obligations  under  this  Section  4.2,   notwithstanding  any  conflicting
     provision  contained  in this  Agreement  or any other  agreement  with the
     Borrower.

          4.3 Default  Interest Rate. Upon the failure of the Borrower to comply
     with any covenant contained in Section 8.1 or Article 10 of this Agreement,
     the rate of interest on each of the  Obligations  shall be  increased  to a
     rate at all times  equal to two  percentage  points  (2%) above the rate of
     interest which would be in effect absent such failure of  compliance,  such
     increased  rate to remain in effect  through and  including  the end of the
     fiscal  quarter in which such failure of compliance  is remedied.  Upon the
     occurrence of an Event of Default,  the provisions of this paragraph  shall
     be superseded by the provisions of the second paragraph of this Section 4.3
     which  relates  to  increases  in the  rate  of  interest  in  case  of the
     occurrence of an Event of Default.

          Upon the  occurrence  of an Event of Default,  the rate of interest on
     each of the Obligations  shall be increased to a rate at all times equal to
     two  percentage  points (2%) above the rate of  interest  which would be in
     effect absent such failure of compliance,  such increased rate to remain in
     effect through and including  payment in full of all of the Obligations and
     cancellation  of  further  commitments  to lend under  this  Agreement,  or
     written waiver of such Event of Default by the Bank.
<PAGE>
          4.4 Late  Payment  Fees.  If the  entire  amount of  principal  and/or
     interest  is not paid in full  under any of the Loan  Documents  within ten
     (10) days after the same is due,  Borrower shall pay to the Bank a late fee
     equal to two percent (2%) of the required payment.

          4.5 Prepayments Upon Default.  If by reason of an Event of Default the
     Bank elects to declare the  Obligations to be immediately  due and payable,
     then any Break Cost or  prepayment  charge with respect to the  Obligations
     shall  become due and payable in the same manner as though the Borrower had
     exercised a right of prepayment.


ARTICLE 5 - COLLATERAL AND GUARANTEES

          5.1  Security  Interests.  As  collateral  for  all  Obligations,  the
     Borrower  shall  provide to the Bank,  and shall  cause each  Guarantor  to
     provide to the Bank, a security  interest and lien in all their  respective
     assets,  including  without  limitation  machinery,  equipment,  furniture,
     fixtures, vehicles, accounts, inventory, chattel paper, interests in leases
     and property under lease,  intellectual property and proprietary interests,
     documents,  instruments,  and general intangibles.  Such security interests
     shall  be  first  liens  on  such  assets,  which  shall  not be  otherwise
     encumbered  except as specified on Schedule 5.1 attached  hereto and made a
     part hereof.

          Detection's  assets,  Radionics'  assets,  and the Guarantors'  assets
     located in Tennessee,  as well as the security interest of the Bank in such
     Tennesee assets,  shall be limited to the aggregate principal amount of One
     Hundred Fifty Thousand  Dollars  ($150,000) each, and in each case together
     with all related interest,  costs, expenses,  fees, and charges of any kind
     or nature.

          5.2 Guarantees. Radionics shall provide its unconditional guarantee of
     the  Obligations  of Detection  related to the  Mortgage  Loan and the Term
     Loan.  The  Borrower  shall  cause  all  Subsidiaries  other  than  Foreign
     Subsidiaries to become Guarantors.  The Guarantor  guarantees shall contain
     an agreement that,  except for intercompany  transactions with the Borrower
     or other Subsidiaries, such Guarantor shall comply in all respects with the
     requirements  set  forth  in  Section  8.13,  and  9.10,  and with the same
     requirements  as are  imposed  upon  the  Borrower  in  Article  11 of this
     Agreement.

          5.3 Stock  Pledge.  The  Borrower  shall pledge to the Bank (a) all of
     Borrower's shares of capital stock of Domestic Subsidiaries, and (b) in the
     case of each  First-Tier  Foreign  Subsidiary,  65% of the  total  combined
     voting power of all classes of stock of such First-Tier  Foreign Subsidiary
     entitled  to vote.  No stock of any Foreign  Subsidiary  other than a First
     Tier Foreign Subsidiary shall be pledged to the Bank.

          5.4 Landlord Waivers.  The Borrower shall deliver to the Bank a waiver
     from each landlord and mortgagee of premises on which the Bank's collateral
     is located and that is not owned by the Borrower.
<PAGE>
          5.5 Mortgage.  The Bank shall receive a Mortgage  covering the fee and
     leasehold  interests of Detection and the Agency in the facility located at
     130 Perinton Parkway, Town of Perinton, New York owned in part by Detection
     and owned in part by the Agency and leased by the Agency to Detection.  The
     Mortgage shall secure the Mortgage Loan.  Unencumbered  (except as provided
     on Schedule 5.1) and  marketable  title to the  Mortgaged  Property must be
     acceptable to the Bank's  attorneys.  The lien of the Mortgage  shall cover
     all improvements to the Mortgaged Property, ingress and egress thereto, and
     all  easements  and  licenses   necessary  or   appropriate  in  connection
     therewith.  The  lien  of the  Mortgage  also  shall  cover  all  fixtures,
     equipment,  and other  personal  property  installed upon or affixed to the
     Mortgaged Property including without limitation mechanical equipment.

          5.6  Assignment of Leases.  The Agency shall assign as collateral  for
     the  Obligations  the Lease Agreement made by the Agency to Detection dated
     as of February 1, 1982 between the Agency and Detection.


ARTICLE 6 - REPRESENTATIONS OF BORROWER

          The Borrower represents and warrants to the Bank as follows:

          6.1  Organization  and Power.  Detection  is duly  organized,  validly
     existing and in good standing  under the laws of the State of New York, and
     is duly  qualified to transact  business and in good standing in all states
     in which it is  required  to qualify or in which  failure to qualify  could
     have a material  adverse  impact on its business.  Detection has full power
     and authority to own its properties,  to carry on its business as now being
     conducted,  to execute,  deliver and perform this Agreement and all related
     documents and instruments,  and to consummate the transactions contemplated
     hereby.  Detection has no Subsidiaries or Affiliates  except  Radionics and
     those listed on Schedule 6.1.

          Radionics is duly  organized,  validly  existing and in good  standing
     under  the  laws of the  State  of  California,  and is duly  qualified  to
     transact  business  and in good  standing  in all  states  in  which  it is
     required  to qualify or in which  failure to qualify  could have a material
     adverse  impact on its business.  Radionics has full power and authority to
     own its  properties,  to carry on its business as now being  conducted,  to
     execute,  deliver and perform this Agreement and all related  documents and
     instruments,  and  to  consummate  the  transactions  contemplated  hereby.
     Radionics  has no  Subsidiaries  or Affiliates  except  Detection and those
     listed on Schedule 6.1.

          Each  Subsidiary  is  duly  organized,  validly  existing  and in good
     standing under the laws of the state or country of its organization, and is
     duly qualified to transact  business and in good standing in all states and
     countries in which it is required to qualify or in which failure to qualify
     could have a material  adverse impact on its business.  Each Subsidiary has
     full power and authority to own its properties, to carry on its business as
     now being conducted, to execute,  deliver and perform its obligations under
     this Agreement and all documents and instruments related to this Agreement,
     and to consummate the transactions contemplated hereby.
<PAGE>
          6.2 Proceedings of Borrower.  All necessary  action on the part of the
     Borrower,  including shareholder approval to the extent required,  relating
     to  authorization  of the execution and delivery of this  Agreement and all
     related  documents and instruments,  and the performance of the Obligations
     of the Borrower hereunder and thereunder has been taken. This Agreement and
     all related documents and instruments  constitute legal,  valid and binding
     obligations  of  the  Borrower,   enforceable  in  accordance   with  their
     respective  terms,  except as  enforceability  may be limited by applicable
     bankruptcy,  insolvency  or similar law  affecting  the rights of creditors
     generally, and equitable principles. The Borrower has no defenses, offsets,
     claims, or counterclaims with respect to its obligations arising under this
     Agreement  and all related  documents  and  instruments.  The execution and
     delivery by the Borrower of this  Agreement  and all related  documents and
     agreements,  and the performance by the Borrower of its  obligations  under
     this Agreement and all related  documents and  agreements  will not violate
     any provision of law or either of the Borrower's respective Certificates of
     Incorporation   or  By-laws  or   organizational   or  other  documents  or
     agreements.  The execution,  delivery and performance of this Agreement and
     all  related  documents  and  agreements,   and  the  consummation  of  the
     transactions  contemplated  hereby will not violate,  be in conflict  with,
     result in a breach of, or constitute a default under any agreement to which
     the Borrower is a party or by which any of its properties is bound,  or any
     order,   writ,   injunction,   or  decree  of  any  court  or  governmental
     instrumentality,  and will not result in the creation or  imposition of any
     lien,  charge or encumbrance upon any of its properties  except in favor of
     the Bank.

          All  necessary  action  on the  part  of  each  Subsidiary,  including
     shareholder  approval to the extent required,  relating to authorization of
     the execution and delivery of this Agreement and all related  documents and
     instruments,  and the  performance of the  Obligations  of each  Subsidiary
     hereunder and  thereunder  has been taken.  All  documents and  instruments
     related  to  this  Agreement  executed  by  each  Subsidiary   respectively
     constitute  legal,  valid  and  binding  obligations  of  such  Subsidiary,
     enforceable  in  accordance  with  their   respective   terms,   except  as
     enforceability  may be  limited by  applicable  bankruptcy,  insolvency  or
     similar law  affecting  the rights of creditors  generally,  and  equitable
     principles.  No Subsidiary has defenses,  offsets, claims, or counterclaims
     with respect to its obligations arising under all documents and instruments
     related to this Agreement. The execution and delivery by each Subsidiary or
     all documents and agreements related to this Agreement, and the performance
     by each Subsidiary of its obligations  under this Agreement and all related
     documents  and  agreements  will not  violate any  provision  of law or any
     Subsidiary's  Certificate of Incorporation or By-laws or  organizational or
     other documents or agreements.  The execution,  delivery and performance of
     all  documents  and  agreements   related  to  this   Agreement,   and  the
     consummation of the transactions  contemplated  hereby will not violate, be
     in conflict with,  result in a breach of, or constitute a default under any
     agreement  to  which  any  Subsidiary  is a party  or by  which  any of its
     properties is bound, or any order, writ, injunction, or decree of any court
     or  governmental  instrumentality,  and will not result in the  creation or
     imposition of any lien,  charge or  encumbrance  upon any of its properties
     except in favor of the Bank.

          6.3  Capitalization.  All of the  outstanding  shares and other equity
     interests of both of the Borrowers are duly authorized, validly issued, and
     fully paid.  There is no existing  contract,  debenture,  security,  right,
     option, warrant, call or similar commitment of any character calling for or
     relating to the issuance, retirement,  redemption,  purchase, or repurchase
     of shares or other equity interests of the Borrower.
<PAGE>
          All of the  outstanding  shares  and other  equity  interests  of each
     Subsidiary are duly authorized, validly issued, and fully paid. There is no
     existing contract,  debenture,  security,  right, option,  warrant, call or
     similar  commitment  of  any  character  calling  for  or  relating  to the
     issuance,  retirement,  redemption,  purchase,  or  repurchase of shares or
     other equity  interests of any Subsidiary  except with respect to Emergency
     Communications,  Inc. pursuant to the Shareholders  Agreement dated January
     26, 1993, a complete  copy of which has been  provided to the Bank prior to
     the date hereof.

          6.4  Litigation.  Except as shown on Schedule 6.4, there is no action,
     suit or  proceeding  at law or in equity or by or before  any  governmental
     instrumentality  or  other  agency  pending  or,  to the  knowledge  of the
     Borrower, threatened against or affecting the Borrower (i) that brings into
     question the legality,  validity or enforceability of this Agreement or the
     transactions  contemplated  hereby or (ii) that,  if adversely  determined,
     would have a material  adverse  effect on the  financial  condition  or the
     business of the Borrower.

          There is no action,  suit or  proceeding  at law or in equity or by or
     before any governmental  instrumentality or other agency pending or, to the
     knowledge of the Borrower,  threatened  against or affecting any Subsidiary
     (i) that brings into question the legality,  validity or  enforceability of
     this  Agreement or the  transactions  contemplated  hereby or (ii) that, if
     adversely determined, would have a material adverse effect on the financial
     condition or the business of the Subsidiary.

          6.5 Financial  Statements.  All financial  statements furnished by the
     Borrower  to the Bank are  complete  and  correct,  have been  prepared  in
     accordance  with  generally  accepted  accounting  principles  consistently
     applied throughout the periods indicated,  and fairly present the financial
     condition of the Borrower and its Subsidiaries,  as of the respective dates
     thereof and the results of their  respective  operations for the respective
     periods covered thereby.

          6.6  Adverse  Changes.  Since  the most  recent  financial  statements
     described in Section 6.5 hereof there has been no material  adverse  change
     in  the  condition,   financial  or  otherwise,  of  the  Borrower  or  its
     Subsidiaries, taken as a whole.

          6.7 Taxes.  The  Borrower has filed or caused to be filed when due all
     federal tax returns and all state and local tax returns  that are  required
     to be  filed,  and has paid or caused to be paid all taxes as shown on said
     returns or any  assessment  received.  Detection's  tax  returns  have been
     audited and tax years closed through and including  fiscal 1994.  Radionics
     tax returns have been audited and tax years  closed  through and  including
     fiscal 1992.  Each  Subsidiary has filed or caused to be filed when due all
     federal tax returns and all state and local tax returns  that are  required
     to be  filed,  and has paid or caused to be paid all taxes as shown on said
     returns or any  assessment  received.  The  Borrower's  tax returns are not
     being  audited on the date of this  Agreement and the Borrower has not been
     notified of any intention by any taxing authority to conduct such an audit.
<PAGE>
          6.8 Properties.  The Borrower and each of its  Subsidiaries  have good
     and  marketable  title to all of their  properties  and  assets,  including
     without limitation,  the properties and assets reflected in the most recent
     financial  statements  referred to in Section 6.5 hereof.  The Borrower and
     each of its Subsidiaries  have undisturbed  peaceable  possession under all
     leases under which they are  operating,  none of which  contain  unusual or
     burdensome  provisions  that may  materially  affect the  operations of the
     Borrower  and its  Subsidiaries,  and all such leases are in full force and
     effect.

          6.9  Indebtedness.  Except as disclosed  in the most recent  financial
     statements  referred  to in  Section  6.5  hereof,  the  Borrower  and  its
     Subsidiaries have no outstanding Debt.

          6.10 ERISA.  No action,  event, or transaction has occurred that could
     give rise to a lien or  encumbrance  on the assets of the  Borrower  or its
     Subsidiaries  as a result of the  application  of  relevant  provisions  of
     ERISA,  and the Borrower and its  Subsidiaries  are in material  compliance
     with all requirements of ERISA.

          6.11 Margin  Securities.  No proceeds of the Obligations  have been or
     will be used for the purpose of purchasing or carrying Margin Securities as
     defined in Regulation U of the Federal Reserve Board.

          6.12 Compliance With Law. The Borrower and its Subsidiaries are not in
     violation of any laws,  ordinances,  governmental rules,  requirements,  or
     regulations  to which they are subject  which  violation  might  materially
     adversely affect the condition (financial or otherwise) of the Borrower and
     its  Subsidiaries.  The Borrower and its Subsidiaries have obtained and are
     in compliance  with all licenses,  permits,  franchises,  and  governmental
     authorizations  necessary  for the  ownership of their  properties  and the
     conduct of their  business,  for which  failure to comply could  materially
     adversely affect the condition (financial or otherwise) of Borrower and its
     Subsidiaries.

          6.13 Patents,  Trademarks,  and  Authorizations.  The Borrower and its
     Subsidiaries own or possess all patents,  trademarks,  service marks, trade
     names, copyrights,  licenses,  authorizations,  other intellectual property
     rights,  and all rights with  respect to the  foregoing,  necessary  to the
     conduct of their  business as now conducted  without any material  conflict
     with the rights of others.

          6.14 Contracts and Agreements.  The Borrower and its  Subsidiaries are
     not parties to any contract or agreement that materially  adversely affects
     their business, property, assets, or condition, financial or otherwise, and
     the  Borrower  and  its  Subsidiaries  are in  compliance  in all  material
     respects with all contracts and agreements to which they are a party.

          6.15 Year 2000.  The Borrower and its  Subsidiaries  have reviewed the
     areas within their business and operations that could be adversely affected
     by, and have  developed or are  developing a program to address on a timely
     basis,   the  "Year  2000  Problem"   (that  is,  the  risk  that  computer
     applications  used by the  Borrower and its  Subsidiaries  may be unable to
     recognize and perform properly  date-sensitive  functions involving certain
     dates prior to and any date after December 31, 1999).  Based on such review
     and program,  the Borrower reasonably believes that the "Year 2000 Problem"
     will not have a material  adverse  effect on the  business,  operations  or
     financial conditions or prospects of the Borrower and its Subsidiaries.
<PAGE>
ARTICLE 7 - CONDITIONS OF LENDING

          The following  conditions must be satisfied before the Bank shall have
     any obligation to make any advance under this Agreement:

          7.1 Representations and Warranties. The representations and warranties
     of the Borrower  contained  herein shall be true and correct as of the date
     of making of each such  advance,  with the same effect as if made on and as
     of such date.

          7.2 No  Defaults.  There  shall  exist  no  condition  or  event  that
     constitutes  (or that,  with the giving of notice or the passage of time or
     both, would  constitute) an Event of Default under Article 12 hereof at the
     time each advance is made.

          7.3  Performance.  The Borrower shall have performed and complied with
     all agreements and conditions  required to be performed or complied with by
     it prior to or at the time the advance is made.

          7.4 Opinion of Counsel.  The Borrower  shall have delivered an opinion
     of its  counsel,  dated  the  date  of this  Agreement,  and  upon  request
     supplemental  opinions dated the date of the advance, in form and substance
     reasonably satisfactory to the Bank.

          7.5 Documents to be Delivered.  The Borrower  shall have  delivered to
     the Bank all security agreements,  reimbursement  agreements,  assignments,
     guarantees,  and any related documents necessary or desirable in connection
     with the  requirements  of  Article 5  hereof.  All  notes  evidencing  the
     Obligations shall have been delivered to the Bank at the time of the making
     of the respective loans.

          7.6 Certified  Resolutions.  Each of the Borrowers and the  Guarantors
     shall have delivered a certificate of its corporate  secretary  certifying,
     as of the  date of the  first  advance,  resolutions  duly  adopted  by its
     respective  Board of  Directors  authorizing  the  execution,  delivery and
     performance of this Agreement, or in the case of Guarantors, its respective
     guarantee, and all related documents and agreements and the consummation of
     the transactions  contemplated  hereby,  which  resolutions shall remain in
     full force and effect so long as any of the  Obligations are outstanding or
     any commitment to lend exists under this Agreement.

          7.7 Fees and Taxes.  The  Borrower  shall  have paid all filing  fees,
     taxes, and assessments  related to the borrowings and the perfection of any
     interests in collateral security required hereunder.

          7.8 Insurance. The Borrower shall have delivered evidence satisfactory
     to the Bank of the existence of insurance required hereby.
<PAGE>
          7.9 Organizational Documents. The Borrower shall have delivered to the
     Bank copies of its  then-effective  Certificate of Incorporation,  By-laws,
     d/b/a certificates, and other organizational documents and instruments, and
     upon request of the Bank, a written  certificate  that such  documents  and
     instruments  have not been  changed  or amended  since the last  advance to
     Borrower pursuant to the terms of this Agreement.

          7.10 Other  Documents  and  Agreements.  On or before the date of this
     Agreement,   the  Borrower  shall  have  delivered  such  other  documents,
     instruments,  and  agreements as the Bank and its legal counsel may require
     in connection with the transactions contemplated hereby.

          7.11  Certificates  of Good  Standing.  On or before  the date of this
     Agreement the Borrower  shall have  delivered to the Bank  certificates  of
     good standing from appropriate  state officials to the effect that the each
     of  the  Borrowers  and  each  Domestic  Subsidiary  that  owns  a  Foreign
     Subsidiary  is in good standing in the state of its formation as well as in
     all  other  states  in which  qualification  is  necessary  for each of the
     Borrowers and such Domestic  Subsidiaries  to carry on its business in such
     states.

          7.12 Appraisal. The Borrower shall have delivered to the Bank prior to
     the making of the Mortgage  Note an appraisal in form  satisfactory  to the
     Bank,  prepared by appraisers  satisfactory  to the Bank,  showing that the
     principal  amount of the Mortgage Note will not exceed eighty percent (80%)
     of the fair market value of the Mortgaged Property.

          7.13 Title  Insurance.  Prior to the making of the Mortgage  Loan, the
     Borrower  shall  have  delivered  to the  Bank's  legal  counsel an updated
     Abstract  of Title and shall have  delivered  title  insurance  in the face
     amount of the Mortgage Loan, with all title exceptions being subject to the
     approval of the Bank's attorneys.

          7.14 Survey.  Prior to the making of the Mortgage  Loan,  the Borrower
     shall have  delivered to the Bank a survey  prepared by a  registered  land
     surveyor,  showing all  encroachments  or easements  across property lines.
     Those  encumbrances  not  acceptable  to the Bank and its  counsel  must be
     removed.  Said survey is to be approved by,  satisfactory to, and certified
     to the Bank, the Bank's attorneys, and the title insurance company.

          7.15 Real Estate Taxes.  Prior to the making of the Mortgage Loan, the
     Borrower  must  provide  proof of payment of current  real estate taxes and
     assessments related to the Mortgaged  Property,  or payment of all payments
     due under any payment-in-lieu-of-tax agreements, if any.

          7.16  Environmental  Report.  The Borrower  shall have provided to the
     Bank an environmental  inspection report covering the Mortgaged Property in
     form  and  substance   satisfactory  to  the  Bank  prepared  by  engineers
     satisfactory to the Bank.
<PAGE>
ARTICLE 8 - AFFIRMATIVE COVENANTS OF BORROWER

          So long as any  Obligations  to the Bank shall be  outstanding or this
     Agreement remains in effect, unless the Bank otherwise consents in writing,
     the Borrower shall:

          8.1  Financial  Statements.  Furnish to the Bank as soon as available,
     but in no event later than one hundred  twenty  (120) days after the end of
     each of its fiscal years, copies of its annual report containing its annual
     financial  statements  audited by and with an  unqualified  opinion from an
     independent  certified  public  accountant  satisfactory  to the Bank. Said
     financial statements shall be accompanied by (i) copies of its Form 10K for
     the  respective  year,  (ii) a schedule  showing  computation  of financial
     covenants, (iii) a copy of any management letter prepared by the Borrower's
     accountants,  and (iv) a certificate of the Chief Financial  Officer or the
     Chief  Accounting  Officer of the  Borrower  to the effect that no Event of
     Default has occurred and no condition exists which with the passage of time
     or the giving of notice would constitute an Event of Default.

          The   Borrower   also  shall   furnish  to  the  Bank  copies  of  its
     consolidating  quarterly  financial  statements  and Form 10Q not more than
     fifty (50) days after the close of each  quarter of its fiscal  year.  Said
     statements  shall be accompanied by (i) a schedule  showing  computation of
     financial covenants,  and (ii) a certificate of the Chief Financial Officer
     or the Chief Accounting Officer of the Borrower to the effect that no Event
     of Default has occurred  and no condition  exists which with the passage of
     time or the giving of notice would constitute an Event of Default.

          The Borrower shall provide to the Bank interim  financial  statements,
     if any, prepared by the Borrower's independent accountants.

          8.2  Other  Reports  and  Inspections.  Furnish  to the Bank an annual
     budget  within 30 days of the  commencement  of any fiscal  year,  and such
     additional  information,  reports, or financial statements as the Bank may,
     from time to time, reasonably request.

          The Borrower shall permit any person designated by the Bank to inspect
     the property,  assets,  and books of the Borrower at reasonable  times and,
     prior to an Event of Default, upon reasonable notice, and shall discuss its
     affairs, finances, and accounts at reasonable times with the Bank from time
     to time as often as may be reasonably requested.

          8.3 Taxes.  Pay and  discharge  all taxes,  assessments,  levies,  and
     governmental charges upon the Borrower,  its income and property,  prior to
     the date on which penalties are attached thereto;  provided,  however, that
     the Borrower may in good faith contest any such taxes, assessments, levies,
     or charges so long as such  contest is  diligently  pursued  and no lien or
     execution  exists or is levied against any of Borrower's  assets related to
     the contested items and so long as Borrower maintains all reserves required
     by GAAP.
<PAGE>
          8.4 Insurance.  Maintain or cause to be maintained insurance, of kinds
     and  in  amounts  satisfactory  to the  Bank,  with  responsible  insurance
     companies  on all of its real and personal  properties  in such amounts and
     against such risks as are prudent,  including but not limited to, full-risk
     extended  coverage  hazard  insurance to the full  insurable  value of real
     property  (co-insurance  not being  permitted  without  the  prior  written
     consent of the Bank),  all-risk  coverage for personal  property,  business
     interruption or loss of rents coverage,  worker's  compensation  insurance,
     and comprehensive  general liability and products liability insurance.  The
     Borrower  also shall  maintain  flood  insurance  covering  any of its real
     properties  located in flood zones. The Borrower shall provide to the Bank,
     no less often  than  annually  and upon its  request,  a detailed  list and
     evidence  satisfactory  to the Bank of its insurance  carriers and coverage
     and shall  obtain  such  additional  insurance  as the Bank may  reasonably
     request. Hazard insurance policies for real property shall name the Bank as
     mortgagee,  and for personalty,  additional  insured and loss payee, as its
     interests may appear.  All policies  shall provide for at least thirty (30)
     days' prior notice of cancellation to the Bank.

          8.5 Existence.  Cause to be done all things  necessary to preserve and
     to keep in full force and effect its existence,  rights, and franchises and
     to comply in all material  respects with all valid laws and regulations now
     in effect or hereafter promulgated by any properly constituted governmental
     authority having jurisdiction.

          8.6  Maintenance  of  Properties.  At all  times  maintain,  preserve,
     protect,  and keep its property used or useful in conducting  its business,
     in good repair,  working order,  and condition and, from time to time, make
     all needful and proper repairs, renewals,  replacements,  betterments,  and
     improvements  thereto,  so that the business carried on may be properly and
     advantageously conducted at all times.

          8.7 Material  Changes,  Judgments.  Notify the Bank immediately of any
     material  adverse change in the financial  condition of the Borrower and of
     the  filing  of  any  suits,   judgments,  or  liens  which,  if  adversely
     determined,  could  have a  material  adverse  effect  on the  business  or
     financial  condition of the  Borrower.  The Borrower  also shall notify the
     Bank  immediately of any change in the name,  identity,  or  organizational
     structure  of the  Borrower,  or any  change  in any  equity  or  ownership
     interest in Radionics, the Guarantors, or any Foreign Subsidiary.

          8.8  ERISA  Compliance.  Comply  in all  material  respects  with  the
     provisions of ERISA and regulations and interpretations related thereto.

          8.9  Franchises/Permits/Laws.  Preserve  and  keep in full  force  and
     effect  all  franchises,  permits,  licenses,  and other  authority  as are
     necessary  to enable it to conduct its  business as being  conducted on the
     date of this  Agreement and comply in all material  respects with all laws,
     regulations, and requirements now in effect or hereafter promulgated by any
     properly constituted governmental authority having jurisdiction over it.

          8.10  Payments.  Make  all  payments  as and  when  required  by  this
     Agreement  and the  notes  and other  agreements  related  hereto or to the
     Obligations.
<PAGE>
          8.11 Deposits/Bank Services.  Detection,  and to the extent practical,
     Radionics,  shall maintain all of its main depository  accounts at the Bank
     and shall obtain its cash management services from the Bank.

          8.12  Amendments.  Give the Bank  written  notice of an  amendment  or
     modification  to  the  Certificate  of  Incorporation  or  other  governing
     documents or agreements of either Borrower.

          8.13  Subsidiaries.  Cause each  Subsidiary  to comply in all respects
     with the same  requirements  as are imposed  upon the  Borrower in Sections
     8.3, 8.4, 8.5, 8.6, 8.7, 8.8, and 8.9 of this Agreement.

ARTICLE 9 - NEGATIVE COVENANTS OF BORROWER

          So long as any  Obligations  shall be  outstanding,  or this Agreement
     shall remain in effect,  unless the Bank otherwise consents in writing, the
     Borrower shall not, directly or indirectly:

          9.1 Debt/Liens.  Create, incur, assume, or allow to exist, voluntarily
     or involuntarily,  any Debt, or any security interest,  assignment, pledge,
     lien or  other  encumbrance  for the  purpose  of  collateral  of any  kind
     (including the charge upon property  purchased under  conditional  sales or
     other  title  retention  agreements)  upon any of its  property  or assets,
     whether now owned or hereafter  acquired,  or become the general partner in
     any  partnership,  excluding only (i)  Obligations to and interests held by
     the Bank,  (ii) Debt  described in Schedule 9.1 attached  hereto and made a
     part  hereof,  (iii)  encumbrances  described  in  Schedule  5.1,  and (iv)
     obligations and interests to which the Bank consents in writing.

          9.2  Loans  and  Investments.  Make any  loan or  advance  to,  or any
     investment of any kind in, any person, firm, joint venture,  corporation or
     other entity whatsoever,  except (i) short-term investments in certificates
     of deposit of financial  institutions  and similar  investments made in the
     ordinary  course of  business,  and (ii) to the  extent  permitted  by this
     Agreement,  to or in  any  Subsidiary,  provided  however,  that  aggregate
     investments  and/or capital  contributions by the Borrower and its Domestic
     Subsidiaries in or to the Foreign  Subsidiaries (taken as a whole) shall in
     no event exceed $1,000,000 per year.

          9.3 Mergers,  Sales and  Acquisitions/Change  in Ownership  Interests.
     Enter into any merger or consolidation, or acquire all or substantially all
     the stock or other ownership interests or assets of any person, firm, joint
     venture,  corporation,  or other entity except for acquisition transactions
     involving the  expenditure  by the Borrower and its  Affiliates of not more
     than  $1,000,000  in total  consideration  in any one year or in any single
     transaction; or sell, lease, transfer, or otherwise dispose of any material
     portion of its assets except in the ordinary course of business.
<PAGE>
          The  Borrower  will not allow any  change in the  ownership,  legal or
     equitable,  of the shareholder or other equity interests in Radionics or in
     the  Subsidiaries  except  between or among the  Borrower  and the Domestic
     Subsidiaries.

          9.4 Amendments. Allow the amendment or modification of either of their
     Certificates of Incorporation,  By-laws,  or other governing  documents and
     agreements in any material respect without the prior written consent of the
     Bank.

          9.5 Compensation.  Compensate any person or entity,  including without
     limitation salaries,  bonuses,  consulting fees, or otherwise, in excess of
     amounts reasonably related to services rendered to the Borrower.

          9.6 Judgments. Allow to exist any judgments against Borrower in excess
     of $100,000 which are not fully covered by insurance or for which an appeal
     or other  proceeding  for the review  thereof shall not have been taken and
     for  which a stay of  execution  pending  such  appeal  shall not have been
     obtained.

          9.7 Margin  Securities.  Allow any proceeds of the  Obligations  to be
     used for the  purpose  of  carrying  any  Margin  Securities  as defined in
     Regulation U of the Board of Governors of the Federal Reserve.

          9.8 Tennessee  Assets.  Allow any of either of their respective assets
     to be  located  in the  State of  Tennessee  with a value in  excess of the
     dollar amount limitation of coverage by the respective  Borrower's Security
     Agreements related to Tennessee assets.

          9.9 Negative Pledge. Assign, transfer, pledge or otherwise encumber to
     or in favor of anyone other than the Bank any property,  real,  personal or
     intangible,  which the Borrower now or hereafter owns. Borrower will not at
     any time enter into any agreement  with anyone other than the Bank in which
     the Borrower agrees not to assign,  transfer,  pledge or otherwise encumber
     any  property,  real,  personal or  intangible,  which the  Borrower now or
     hereafter owns.

          9.10  Subsidiaries.  Cause each  Subsidiary  to comply in all respects
     with the same  requirements  as are imposed  upon the  Borrower in Sections
     9.1, 9.2, 9.3, 9.5, 9.6, 9.8 and 9.9 of this Agreement.


ARTICLE 10 - FINANCIAL COVENANTS

          The financial covenants set forth in Section 10.1, 10.2, 10.3 and 10.4
     shall be determined by  calculating  such covenant for the Borrower and its
     Subsidiaries on a consolidated basis and without  duplication in accordance
     with GAAP.

          So long as any  Obligations  to the Bank shall be  outstanding or this
     Agreement remains in effect, unless the Bank otherwise consents in writing,
     the Borrower, shall:
<PAGE>
          10.1 Minimum  Current  Ratio.  Maintain a minimum  Current Ratio of at
     least 2.0 to 1.0, as shown on each quarterly  financial  statement provided
     to the Bank.

          10.2  Minimum  Fixed Charge  Coverage.  Maintain a ratio of (a) EBITDA
     minus Distributions to (b) Fixed Charges, calculated for the quarter ending
     on the  measurement  date  plus the  fewer  of  either  (i) the last  three
     preceding  quarters,  or (ii) the number of quarters except the measurement
     date  quarter  that  have  ended  after  March  31,  1998,  as shown on the
     quarterly financial statements provided to the Bank, of at least 1.5 to 1.0
     for the quarter ending June 30, 1998 and thereafter.

          10.3  Maximum  Funded Debt  Ratio.  Maintain a ratio of Funded Debt to
     EBITDA,  calculated for the quarter ending on the measurement date plus the
     three preceding quarters, not exceeding:

          (a)  2.75  to 1.0  measured  commencing  September  30,  1998,  and on
     December 31, 1998,  March 31, 1999,  June 30, 1999,  September 30, 1999 and
     December 31, 1999 

          (b) 2.5 to 1.0  measured on March 31, 2000,  June 30, 2000,  September
     30, 2000, and December 31, 2000,
  
          (c) 2.25 to 1.0 measured on March 31, 2001,  June 30, 2001,  September
     30, 2001, and December 31, 2001, and

          (d) 2.0  measured  on March  31,  2002 and at the end of each  quarter
     thereafter.

          10.4 Minimum Tangible Net Worth. Maintain a minimum Tangible Net Worth
     equal to at least ninety  percent (90%) of the higher of Tangible Net Worth
     of the  Borrower  (a) as of the  date  of  this  Agreement,  and  (b) as of
     December 31, 1997, as shown on each quarterly  financial statement provided
     to the Bank. Such minimum Tangible Net Worth requirement shall be increased
     in each succeeding  fiscal year by an amount equal to seventy-five  percent
     (75%) of net  operating  income for the prior  fiscal year plus one hundred
     percent  (100%) of the net proceeds  from any sale of stock or other equity
     interests in the Borrower.

          10.5 Limitation on Foreign  Intercompany  Indebtedness.  Ensure at all
     times that aggregate  indebtedness of all Foreign Subsidiaries owing to the
     Borrower  and all  Domestic  Subsidiaries  at no time  exceeds by more than
     $29,900,000  the  aggregate  indebtedness  of the Borrower and all Domestic
     Subsidiaries owing to all Foreign Subsidiaries.

ARTICLE 11 - ENVIRONMENTAL MATTERS; INDEMNIFICATION

          11.1  Environmental  Representations.   The  Borrower  represents  and
     warrants that, to the best of Borrowers's  knowledge and except as shown on
     Schedule 11.1:

          (a)  Neither  the  Improvements  nor  any  property  adjacent  to  the
     Improvements  is  being  or has  been  used  for  the  storage,  treatment,
     generation, transportation, processing, handling, production or disposal of
     any  Hazardous  Substance or as a landfill or other waste  disposal site or
     for the  storage  of  petroleum  or  petroleum  based  products  except  in
     compliance with all Environmental Laws.
<PAGE>
          (b) Underground storage tanks are not and have not been located on the
     Improvements except in compliance with all Environmental Laws.

          (c) The soil, subsoil,  bedrock,  surface water and groundwater of the
     Improvements are free of any Hazardous Substances.

          (d) There has been no Release, nor is there the threat of a Release of
     any  Hazardous  Substance on, at or from the  Improvements  or any property
     adjacent  to or within the  immediate  vicinity of the  Improvements  which
     through soil,  subsoil,  bedrock,  surface water or  groundwater  migration
     could come to be located on the Improvements, and Borrower has not received
     any form of notice or inquiry from any federal, state or local governmental
     agency or authority, any operator, tenant, subtenant,  licensee or occupant
     of the  Improvements  or any property  adjacent to or within the  immediate
     vicinity of the  Improvements  or any other person with regard to a Release
     or the threat of a Release of any  Hazardous  Substance  on, at or from the
     Improvements or any property adjacent to the Improvements.

          (e)  All  Environmental  Permits  relating  to the  Borrower  and  the
     Improvements have been obtained and are in full force and effect.

          (f) No event has occurred with respect to the Improvements which, with
     the passage of time or the giving of notice,  or both,  would  constitute a
     violation of any applicable  Environmental Law or  non-compliance  with any
     Environmental Permit.

          (g) There  are no  agreements,  consent  orders,  decrees,  judgments,
     license or permit  conditions or other orders or directives of any federal,
     state or local  court,  governmental  agency or  authority  relating to the
     past,  present or future  ownership,  use,  operation,  sale,  transfer  or
     conveyance  of the  Improvements  which  require  any change in the present
     condition  of  the  Improvements  or  any  work,   repairs,   construction,
     containment,  clean up, investigations,  studies, removal or other remedial
     action or capital expenditures with respect to the Improvements.

          (h) There are no actions,  suits,  claims or  proceedings,  pending or
     threatened,  which could cause the  incurrence  of expenses or costs of any
     name or  description  or  which  seek  money  damages,  injunctive  relief,
     remedial  action or any other remedy that arise out of, relate to or result
     from (i) a violation or alleged  violation of any applicable  Environmental
     Law or  non-compliance  or alleged  non-compliance  with any  Environmental
     Permit,  (ii) the presence of any  Hazardous  Substance or a Release or the
     threat  of a  Release  of  any  Hazardous  Substance  on,  at or  from  the
     Improvements or any property  adjacent to or within the immediate  vicinity
     of the  Improvements  or (iii) human  exposure to any Hazardous  Substance,
     noises,  vibrations  or nuisances  of whatever  kind to the extent the same
     arise  from  the  condition  of the  Improvements  or the  ownership,  use,
     operation,   sale,  transfer  or  conveyance  thereof.  
<PAGE>
          11.2 Environmental  Covenants.  The Borrower covenants and agrees with
     the Bank that, so long as this  Agreement  remains in effect,  the Borrower
     shall:

          (a) Comply with, and shall cause all operators,  tenants,  subtenants,
     licensees and occupants of the  Improvements  to comply with all applicable
     Environmental  Laws and shall obtain and comply  with,  and shall cause all
     operators, tenants, subtenants, licensees and occupants of the Improvements
     to obtain and comply with, all Environmental Permits.

          (b) Not  cause or  permit  any  change  to be made in the  present  or
     intended  use of the  Improvements  which would (i) violate any  applicable
     Environmental  Law, (ii) constitute  non-compliance  with any Environmental
     Permit or (iii) materially  increase the risk of a Release of any Hazardous
     Substance.

          (c) Promptly  provide Bank with a copy of all  notifications  which it
     gives or receives with respect to any past or present Release or the threat
     of a Release of any Hazardous  Substance on, at or from the Improvements or
     any property adjacent to the Improvements.

          (d) Undertake and complete all investigations,  studies,  sampling and
     testing  and all  removal  and other  remedial  actions  required by law to
     contain,  remove and clean up all Hazardous  Substances that are determined
     to be  present  at the  Improvements  in  accordance  with  all  applicable
     Environmental Laws and all Environmental Permits.

          (e) At all times allow the Bank and its officers,  employees,  agents,
     representatives,  contractors and  subcontractors  reasonable  access after
     reasonable   prior  notice  to  the   Improvements   for  the  purposes  of
     ascertaining  site conditions,  including,  but not limited to,  subsurface
     conditions.

          (f) Deliver promptly to the Bank: (i) copies of any documents received
     from the  United  States  Environmental  Protection  Agency,  or any state,
     county  or  municipal   environmental  or  health  agency   concerning  the
     Borrower's operations or the Improvements; and (ii) copies of any documents
     submitted by the  Borrower to the United  States  Environmental  Protection
     Agency or any state,  county or municipal  environmental  or health  agency
     concerning its operations or the Improvements.
<PAGE>
          (g) If at any  time  the  Bank  obtains  any  reasonable  evidence  or
     information which suggests that a material potential  environmental problem
     may  exist  at the  Improvements,  the  Bank  may  require  that a full  or
     supplemental  environmental inspection and audit report with respect to the
     Improvements  of a  scope  and  level  of  detail  satisfactory  to Bank be
     prepared by an environmental  engineer or other qualified person acceptable
     to the Bank at  Borrower's  expense.  Such  audit may  include  a  physical
     inspection  of the  Improvements,  a  visual  inspection  of  any  property
     adjacent to or within the immediate vicinity of the Improvements, personnel
     interviews and a review of all Environmental Permits. If the Bank requires,
     such  inspection  shall also  include a records  search  and/or  subsurface
     testing for the  presence of  Hazardous  Substances  in the soil,  subsoil,
     bedrock,  surface water and/or groundwater.  If such audit report indicates
     the  presence of any  Hazardous  Substance  or a Release or the threat of a
     Release  of any  Hazardous  Substance  on,  at or  from  the  Improvements,
     Borrower shall promptly  undertake and diligently  pursue to completion all
     necessary,  appropriate and legally authorized investigative,  containment,
     removal,  clean up and other remedial actions, using methods recommended by
     the engineer or other person who prepared said audit report and  acceptable
     to the appropriate federal, state and local agencies or authorities.

          11.3  Indemnity.  The Borrower agrees to indemnify,  defend,  and hold
     harmless  the  Bank  from  and  against  any and all  liabilities,  claims,
     damages,  penalties,  expenditures,  losses, or charges, including, but not
     limited to, all costs of investigation,  monitoring,  legal representation,
     remedial response,  removal,  restoration or permit acquisition of any kind
     whatsoever,  which may now or in the future be undertaken,  suffered, paid,
     awarded,  assessed,  or otherwise incurred by the Bank (or any other person
     or entity  affiliated  with the Bank or representing or acting for the Bank
     or at the  Bank's  behest,  or with a claim on the Bank or to whom the Bank
     has liability or  responsibility  of any sort related to this Section 11.3)
     relating  to,  resulting  from  or  arising  out  of  (a)  the  use  of the
     Improvements  for  the  storage,  treatment,  generation,   transportation,
     processing,  handling, production or disposal of any Hazardous Substance or
     as a  landfill  or other  waste  disposal  site,  (b) the  presence  of any
     Hazardous  Substance  or a  Release  or  the  threat  of a  Release  of any
     Hazardous  Substance  on, at or from the  Improvements,  (c) the failure to
     promptly  undertake  and  diligently  pursue to completion  all  necessary,
     appropriate and legally  authorized  investigative,  containment,  removal,
     clean up and other remedial actions with respect to a Release or the threat
     of a Release of any Hazardous  Substance  on, at or from the  Improvements,
     (d) human  exposure  to any  Hazardous  Substance,  noises,  vibrations  or
     nuisances of whatever  kind to the extent the same arise from the condition
     of the Improvements or the ownership,  use,  operation,  sale,  transfer or
     conveyance  thereof,  (e) a violation of any applicable  Environmental Law,
     (f)  non-compliance  with  any  Environmental  Permit  or  (g)  a  material
     misrepresentation  or  inaccuracy  in any  representation  or warranty or a
     material  breach of or failure to perform any covenant  made by Borrower in
     this  Agreement.  Such costs or other  liabilities  incurred by the Bank or
     other  entity  described  in this  Section 11.3 shall be deemed to include,
     without limitation, any sums which the Bank deems it necessary or desirable
     to expend to protect its security interests and liens.
<PAGE>
          11.4 No  Limitation.  The liability of Borrower  under this Article 11
     shall in no way be limited, abridged, impaired or otherwise affected by (a)
     any  amendment or  modification  of this  Agreement  or any other  document
     relating  to the  Obligations  by or for the  benefit  of  Borrower  or any
     subsequent   owner  of  the   Improvements   except  for  an  amendment  or
     modification  which expressly refers to this Article 11, (b) any extensions
     of time for payment or performance  required by this Agreement or any other
     document  relating to the  Obligations,  (c) the release of  Borrower,  any
     guarantor or any other person from the  performance or observance of any of
     the agreements,  covenants, terms or conditions contained in this Agreement
     or any other  document  relating to the  Obligations  by  operation of law,
     Bank's voluntary act or otherwise,  (d) the invalidity or  unenforceability
     of any of the terms of provisions of this  Agreement or any other  document
     relating to the  Obligations,  (e) any exculpatory  provision  contained in
     this Agreement or any other document  relating to the Obligations  limiting
     Bank's  recourse to  property  encumbered  by any  mortgage or to any other
     security  or  limiting  Bank's  rights  to a  deficiency  judgment  against
     Borrower, (f) any applicable statute of limitations,  (g) any investigation
     or inquiry  conducted by or on the behalf of Bank or any information  which
     Bank may have or obtain with  respect to the  environmental  or  ecological
     condition of the Improvements,  (h) the sale,  assignment or foreclosure of
     any interest in collateral for the Obligations,  (i) the sale,  transfer or
     conveyance  of all or part of the  Improvements,  (j) the  dissolution  and
     liquidation  of  Borrower,  (k)  the  death  or  legal  incapacity  of  any
     individual,  (l) the release or discharge, in whole or in part, of Borrower
     in any bankruptcy, insolvency,  reorganization,  arrangement, readjustment,
     composition,   liquidation  or  similar   proceeding,   or  (m)  any  other
     circumstances which might otherwise constitute a legal or equitable release
     or discharge of Borrower, in whole or in part.

          11.5  Survival.  Notwithstanding  anything to the  contrary  contained
     herein,  the Borrower's  liability and obligations under Section 11.4 shall
     survive the discharge,  satisfaction or assignment of this Agreement by the
     Bank and the payment in full of all of the Obligations.

          11.6   Investigations.   If  the  Borrower  defaults  on  any  of  its
     Obligations pursuant to this Agreement or any other Loan Document, the Bank
     or its  designee  shall  have the  right,  upon  reasonable  notice  to the
     Borrower,   to  enter  upon  the   Improvements  and  conduct  such  tests,
     investigation  and sampling,  including but not limited to  installation of
     monitoring  wells,  as  shall  be  reasonably  necessary  for  the  Bank to
     determine whether any disposal of Hazardous  Substances has occurred on, at
     or near the Improvements.  The costs of all such tests,  investigations and
     samplings  shall be considered as  additional  indebtedness  secured by all
     collateral for the Obligations and shall become immediately due and payable
     without notice and with interest  thereon at highest rate then borne by any
     of the Obligations.
<PAGE>
          11.7 No Warranty Regarding  Information.  The Borrower agrees that the
     Bank shall not be liable in any way for the completeness or accuracy of any
     Environmental  Report or the information  contained  therein.  The Borrower
     further  agrees that the Bank has no duty to warn the Borrower or any other
     person or entity about any actual or potential environmental  contamination
     or other problem that may have become  apparent or will become  apparent to
     the Bank.

ARTICLE 12 - DEFAULTS

          12.1 Defaults.  The following  events  (hereinafter  called "Events of
     Default") shall  constitute  defaults under this Agreement.  Such Events of
     Default shall be without  prejudice to the Bank's rights to demand  payment
     in full of Obligations payable on demand, as specified in this Agreement or
     the notes relating to such Obligations, at any time.

          a. Nonpayment. Failure of the Borrower to make any payment of any type
     under the terms of the Loan  Documents  within ten (10) days after the same
     becomes due and payable.

          b.  Performance.  Failure of the Borrower or any Subsidiary to observe
     or perform any other  condition,  covenant  or term of the Loan  Documents;
     provided,  however, except with respect to Sections 8.1 and 8.4 and Article
     10 of this  Agreement,  if such failure is  susceptible to cure an Event of
     Default shall not occur unless such failure is not cured within thirty (30)
     days  after the Bank  gives the  Borrower  or the  Subsidiary  respectively
     notice of same.

          c. Other  Obligations.  Failure of the Borrower or any  Subsidiary  to
     observe  or perform  any other  condition,  covenant,  or term of any other
     agreement with the Bank after any  applicable  cure or grace period related
     thereto,  or default by the Borrower or any Subsidiary  under any agreement
     involving  Debt or any other  material  agreement  with any third person or
     entity.

          d. Representations. (i) failure of any representation or warranty made
     by the Borrower or any  Guarantor in  connection  with the execution of the
     Loan Documents,  or any  certificate of officers  pursuant  thereto,  to be
     truthful,  accurate  or correct  in all  material  respects,  or (ii) after
     fifteen (15) days notice and failure to cure, failure of any representation
     or warranty made by the Borrower or any  Guarantor in  connection  with the
     performance  of  the  Loan  Documents   after  the  closing  date,  or  any
     certificate  of  officers  pursuant  thereto to be  truthful,  accurate  or
     correct in all material respects.

          e. Financial  Difficulties.  Financial difficulties of the Borrower or
     any Guarantor as evidenced by:

          (i) any  admission in writing of inability to pay debts as they become
     due; or

          (ii) the filing of a voluntary or involuntary  petition in bankruptcy,
     or under any chapters of the Bankruptcy Code, or under any federal or state
     statute providing for the relief of debtors; or

          (iii) making an assignment for the benefit of creditors; or

          (iv) consenting to the appointment of a trustee or receiver for all or
     a major part of any of its property; or

          (v) the entry of a court order  appointing a receiver or a trustee for
     all or a major part of its property; or

          (vi) the occurrence of any event,  action,  or transaction  that could
     give  rise to a lien or  encumbrance  on the  assets of the  Borrower  as a
     result of application of relevant provisions of ERISA.
<PAGE>
          f. Material  Change.  After ten (10) days notice to the Borrower,  any
     condition by reason of which the Bank  reasonably  believes the  Borrower's
     ability to timely repay any Obligations to the Bank is impaired,  including
     without  limitation by reason of material or reasonably  projected material
     change in Borrower's  business or  operations,  or in any factor  affecting
     Borrower's  business or  operations,  or regarding any other  obligation or
     agreement of  Borrower,  or in the  financial  condition of Borrower or its
     Subsidiaries  taken as a whole,  or in the  collateral  for the  Borrower's
     Obligations.

          12.2 Remedies.  If any one or more Events of Default listed in Section
     12.1 (e)(i)-(v)  occur,  (a) any further  commitments or obligations of the
     Bank  shall be deemed to be  automatically  and  without  need for  further
     action  terminated,  and (b) all  Obligations  of the Borrower to the Bank,
     automatically  and without need for further action,  shall become forthwith
     due and payable without  presentment,  demand,  protest, or other notice of
     any kind,  all of which are  hereby  expressly  waived.  If any one or more
     Events of Default other than those listed in Section 12.1 (e)(i)-(v) occur,
     the Bank may, at its option,  take either or both of the following  actions
     at the same or different  times:  (a) terminate any further  commitments or
     obligations of the Bank, and (b) declare all Obligations of the Borrower to
     the  Bank,  automatically  and  without  need  for  further  action,  to be
     forthwith due and payable without  presentment,  demand,  protest, or other
     notice of any kind, all of which are hereby expressly waived.

          In case any such  Events of  Default  shall  occur,  the Bank shall be
     entitled to recover  judgment  against the Borrower for all  Obligations of
     the Borrower to the Bank either before, or after, or during the pendency of
     any proceedings for the enforcement, of any security interests,  mortgages,
     pledges,  or guarantees  and, in the event of realization of any funds from
     any security or  guarantee  and  application  thereof to the payment of the
     Obligations  due,  the Bank shall be  entitled  to  enforce  payment of and
     recover  judgment  for  all  amounts  remaining  due  and  unpaid  on  such
     Obligations.  The Bank shall be  entitled  to  exercise  any other legal or
     equitable  right which it may have,  and may proceed to protect and enforce
     its rights by any other appropriate  proceedings,  including action for the
     specific  performance  of any  covenant  or  agreement  contained  in  this
     Agreement and other agreements held by the Bank.

          After any Event of  Default,  the Bank may  require  the  Borrower  to
     deliver cash  collateral  to the Bank,  together  with  agreements  related
     thereto satisfactory to the Bank in its sole discretion, in an amount equal
     to the aggregate undrawn outstanding amount of all letters of credit issued
     pursuant to Section 2.8 of this Agreement.
<PAGE>
ARTICLE 13 - MISCELLANEOUS

          13.1  Waiver.  No delay or failure of the Bank to exercise  any right,
     remedy,  power or privilege hereunder shall impair the same or be construed
     to be a waiver of the same or of any Event of  Default  or an  acquiescence
     therein.  No single or  partial  exercise  of any right,  remedy,  power or
     privilege shall preclude other or further exercise thereof by the Bank. All
     rights,  remedies,  powers,  and privileges  herein conferred upon the Bank
     shall be deemed cumulative and not exclusive of any others available.

          13.2 Survival of  Representations.  All representations and warranties
     contained herein shall survive the execution and delivery of this Agreement
     and the execution and delivery of other agreements hereunder.

          13.3 Additional  Security/Setoff.  The Borrower and Guarantors  hereby
     grant  to the  Bank a lien,  security  interest,  and  right  of set off as
     security  for the  Obligations  upon and  against  all  deposits,  credits,
     collateral  and  property,  now or  hereafter in the  possession,  custody,
     safekeeping  or control of Bank or any  entity  under the  control of Fleet
     Financial  Group,  Inc.,  or in transit to any of them. At any time without
     demand or  notice,  the Bank may set off the same or any part  thereof  and
     apply the same to any  liability or  obligation  of Borrower or  Guarantors
     even  though  unmatured  and  regardless  of  the  adequacy  of  any  other
     collateral securing the Obligations.  Any and all rights to require Bank to
     exercise its rights or remedies with respect to any other  collateral which
     secures  the  Obligations,  prior to  exercising  its right of set off with
     respect to such  deposits,  credits,  or other  property of the Borrower or
     Guarantors are hereby knowingly, voluntarily, and irrevocably waived.

          13.4  Notices.  Any notice or demand  upon any party  hereto  shall be
     deemed to have been  sufficiently  given or served for all purposes  hereof
     when delivered in person or by nationally recognized overnight courier with
     receipt  requested,  or two Business Days after it is mailed certified mail
     postage prepaid, return receipt requested, addressed as follows:


            If to Bank:       Fleet National Bank
                                    One East Avenue
                                    Rochester, New York 14638
                                    Attention: Corporate Banking Department
                                               Martin K. Birmingham


            If to Borrower:   Detection Systems, Inc.
                                    130 Perinton Parkway
                                    Fairport, New York 14450
                                    Attention: President

Any party may change, by notice in writing to the other parties,  the address to
which notices to it shall be sent.
<PAGE>
          13.5 Entire  Agreement.  This Agreement and the documents  referred to
     herein embody the entire agreement and understanding  among the parties and
     supersede all prior agreements and  understandings  relating to the subject
     matter  hereof. This Agreement shall not be changed or amended without the
     written  agreement  of all parties  hereto.  This  Agreement  embodies  all
     commitments  to lend between the Bank and the Borrower and  supersedes  any
     prior commitments.

          13.6  Parties  in  Interest.  All the  terms  and  provisions  of this
     Agreement  shall  inure  to  the  benefit  of and be  binding  upon  and be
     enforceable by the parties and their respective  successors and assigns and
     shall  inure to the  benefit of and be  enforceable  by any holder of notes
     executed  hereunder.  Upon any transfer of any  Obligation  or any interest
     therein the Bank may deliver or otherwise  transfer or assign to the holder
     any  collateral  or  guarantees  for the  Obligation,  which  holder  shall
     thereupon have all the rights of the Bank.

          13.7  Business  Days.  All Loan  Documents  shall be  governed  by the
     Modified  Following  Business  Day  Convention,  but any  extension of time
     shall, in each such case, be included in the computation of any interest or
     fees.

          13.8 Oral and Telecopy  Requests.  As a  convenience  to the Borrower,
     Borrower  hereby  authorizes  the Bank to rely  upon  requests  made by the
     Borrower  or its  employees  in writing or by  telecopy,  and to treat such
     requests  as if they  were  made in a writing  delivered  to the Bank.  Any
     advance of funds made by the Bank  pursuant  to any such  request  shall be
     deemed to be authorized by the Borrower unless immediately repaid in full.

          13.9 Severability. In the event that any one or more of the provisions
     contained in this Agreement or any other agreement,  document, or guarantee
     related  hereto  shall,  for  any  reason,  be  held  invalid,  illegal  or
     unenforceable   in   any   respect,   such   invalidity,    illegality   or
     unenforceability  shall not affect any other provision of this Agreement or
     such other agreement, document, or guarantee.

          13.10  Governing  Law.  This  Agreement  and the notes and  agreements
     hereunder,  together with all of the rights and  obligations of the parties
     hereto,  shall be construed,  governed and enforced in accordance  with the
     laws  of the  State  of New  York  without  regard  to  conflicts  of  laws
     principles.

          13.11  Participations;  Assignments.  All the terms and  provisions of
     this  Agreement  shall inure to the  benefit of and be binding  upon and be
     enforceable by the parties and their respective  successors and assigns and
     shall  inure to the  benefit of and be  enforceable  by any holder of notes
     executed hereunder.

          Bank may at any time pledge all or any portion of its rights under the
     Loan   Documents,   including  any  portion  of  any  note  evidencing  the
     Obligations, to any of the twelve (12) Federal Reserve Banks.
<PAGE>
          The Bank shall have the unrestricted right at any time or from time to
     time, and without Borrower's or any Guarantor's  consent,  to assign all or
     any portion of its rights and obligations hereunder to one or more banks or
     other financial institutions (each an "Assignee"), and Borrower agrees that
     it shall execute,  or cause to be executed,  and shall cause each Guarantor
     to execute,  such documents,  including without  limitation,  amendments to
     this  Agreement  and to any other  Loan  Documents,  as the Bank shall deem
     necessary to effect the foregoing.  In addition, at the request of the Bank
     and any such  Assignee,  Borrower  shall  issue one or more new  promissory
     notes, as applicable, to any such Assignee and, if Bank has retained any of
     its rights and obligations  hereunder  following such assignment,  to Bank,
     which new promissory  notes shall be issued in  replacement  of, but not in
     discharge of, the liability  evidenced by the promissory  note held by Bank
     prior to such  assignment  and shall  reflect the amount of the  respective
     commitments and loans held by such Assignee and Bank after giving effect to
     such assignment.  Upon the execution and delivery of appropriate assignment
     documentation,  amendments, and any other documentation required by Bank in
     connection  with  such  assignment,  and the  payment  by  Assignee  of the
     purchase price agreed to by Bank and such Assignee,  such Assignee shall be
     a party to this Agreement and shall have all of the rights and  obligations
     of the Bank hereunder  (and under any and all other Loan  Documents) to the
     extent  that such  rights and  obligations  have been  assigned by the Bank
     pursuant  to  the  assignment  documentation  between  the  Bank  and  such
     Assignee,  and Bank shall be released  from its  obligations  hereunder and
     thereunder to a corresponding extent.

          The Bank shall have the  unrestricted  right at any time and from time
     to time, and without the consent of or notice to Borrower or Guarantor,  to
     grant  to one or  more  banks  or  other  financial  institutions  (each  a
     "Participant")   participating  interests  in  Bank's  obligation  to  lend
     hereunder  and/or any or all of the  Obligations.  In the event of any such
     grant by Bank of a participating  interest to  Participant,  whether or not
     upon notice to Borrower,  Bank shall remain responsible for the performance
     of its obligations hereunder and Borrower shall continue to deal solely and
     directly  with  Bank in  connection  with  Bank's  rights  and  obligations
     hereunder.

          The  Bank may  furnish  any  information  concerning  Borrower  in its
     possession  from time to time to  prospective  Assignees and  Participants,
     provided  that the Bank shall  require  any such  prospective  Assignee  or
     Participant  to agree in writing to maintain  the  confidentiality  of such
     information.

          13.12 Clarification of Prior Agreements.  This Agreement clarifies and
     supersedes the Amended and Restated  Credit  Agreement dated as of June 24,
     1997 between the Bank and the Borrower,  and the credit facilities  related
     thereto.

          13.13 Jurisdiction/TRIAL BY JURY. Grantor consents to jurisdiction and
     service of process in the courts of the State of New York and in the courts
     of the United States having jurisdiction hereof. BORROWER AND BANK MUTUALLY
     HEREBY KNOWINGLY,  VOLUNTARILY AND INTENTIONALLY WAIVE THE RIGHT TO A TRIAL
     BY JURY IN RESPECT OF ANY CLAIM BASED  HEREON,  ARISING OUT OF, UNDER OR IN
     CONNECTION WITH THIS AGREEMENT OR ANY OTHER LOAN DOCUMENTS OR ANY COURSE OF
     CONDUCT,  COURSE OF  DEALINGS,  STATEMENTS  (WHETHER  VERBAL OR WRITTEN) OR
     ACTIONS OF ANY PARTY.  THIS WAIVER  CONSTITUTES A MATERIAL  INDUCEMENT  FOR
     BANK TO ACCEPT THIS AGREEMENT AND MAKE THE LOANS CONTEMPLATED HEREUNDER.
<PAGE>
          13.14 Loss or  Mutilation.  Upon receipt of an affidavit of an officer
     of Bank as to the  loss,  theft,  destruction,  or  mutilation  of any note
     evidencing any Obligation or any other Loan Document which is not of public
     record,  and,  in  the  case  of  any  such  loss,  theft,  destruction  or
     mutilation,  upon  surrender  and  cancellation  of such note or other Loan
     Document, Borrower will issue, in lieu thereof, a replacement note or other
     Loan Document in the same  principal  amount  thereof and otherwise of like
     tenor.

          13.15 Usury. All agreements  between  Borrower,any  Guarantor and Bank
     are hereby expressly limited so that in no contingency or event whatsoever,
     whether by reason of acceleration or maturity of the indebtedness evidenced
     hereby or otherwise, shall the amount paid or agreed to be paid to Bank for
     the use or the forbearance of the indebtedness  evidenced hereby exceed the
     maximum  permissible  under  applicable  law.  As  used  herein,  the  term
     "applicable  law"  shall  mean the law in  effect  as of the  date  hereof,
     provided,  however  that in the  event  there is a change  in the law which
     results in a higher  permissible rate of interest,  then the Loan Documents
     shall be governed by such new law as of its effective date. In this regard,
     it is  expressly  agreed that it is the intent of Borrower  and Bank in the
     execution,  delivery and acceptance of this Agreement to contract in strict
     compliance  with the laws of the  State  of New York  from  time to time in
     effect. If, under or from any circumstances whatsoever,  fulfillment of any
     provision hereof or of any of the Loan Documents at the time performance of
     such provision shall be due, shall involve  transcending  the limit of such
     validity  prescribed by applicable law, then the obligation to be fulfilled
     shall automatically be reduced to the limits of such validity, and if under
     or from any  circumstances  whatsoever Bank should ever receive as interest
     an amount  which would exceed the highest  lawful  rate,  such amount which
     would be  excessive  interest  shall be  applied  to the  reduction  of the
     principal balance evidenced hereby and not to the payment of interest. This
     provision  shall control every other  provision of all  agreements  between
     Borrower and Bank.

          13.16 Time of Payments.  In the event that any payment is due from the
     Borrower  under  this  Agreement  or any note,  instrument,  agreement,  or
     document  related  hereto,  such  payment  shall  be  made  in  immediately
     available  funds to the Bank at or before 2:00 p.m. on the  Business Day on
     which such payment is due.  Payments made after such time shall continue to
     bear interest until the next succeeding Business Day at the rates otherwise
     provided in this Agreement.
<PAGE>
          IN WITNESS  WHEREOF,  the parties have executed this  Agreement on the
     date first above written.

                                  FLEET NATIONAL BANK

                                  By: /s/Martin K. Birmingham, Vice President


                                  DETECTION SYSTEMS, INC.

                                  By: /s/Frank J. Ryan, Secretary & Treasurer

 
                                  RADIONICS, INC.

                                  By: /s/Frank J. Ryan, Secretary & Treasurer
<PAGE>

                               INDEX TO SCHEDULES

SCHEDULE 5.1      -     Liens and Encumbrances

SCHEDULE 6.1      -     Affiliates and Subsidiaries

SCHEDULE 6.4      -     Litigation

SCHEDULE 9.1      -     Obligations

SCHEDULE 11.1     -     Environmental Matters



                                INDEX TO EXHIBITS


EXHIBIT A         -     Revolving Line Note

EXHIBIT B         -     Mortgage Loan Note

EXHIBIT C         -     Term Loan Note
<PAGE>
                                  SCHEDULE 5.1
                             Liens and Encumbrances
<PAGE>

                                  SCHEDULE 6.1
                           Affiliates and Subsidiaries
<PAGE>

                                  SCHEDULE 6.4
                                   Litigation
<PAGE>

                                  SCHEDULE 9.1
                                   Obligations
<PAGE>

                                  SCHEDULE 11.1
                              Environmental Matters
<PAGE>

                    AMENDED AND RESTATED REVOLVING LINE NOTE

$17,000,000                                                   September 30, 1998
 
     Unless otherwise  expressly  provided herein, all capitalized terms in this
Amended and Restated  Revolving Line Note ("Revolving Line Note") shall have the
meanings  given to them in the Amended and Restated  Credit  Facility  Agreement
dated as of September 30, 1998,  between the undersigned  ("Borrower") and Fleet
National Bank (as successor to Fleet Bank,  "Bank"), as the same may be amended,
extended, replaced, or modified from time to time (the "Credit Agreement").

     This Revolving Line Note amends, replaces, and restates in its entirety the
Revolving  Line Note dated as of May 31,  1996,  as amended and  restated by the
Amended and Restated Revolving Line Note dated February 18, 1997, as amended and
restated by the Amended and  Restated  Revolving  Line Note dated June 24, 1997,
given by the Borrower in favor of the Bank.


     FOR VALUE RECEIVED, the Borrower, jointly and severally, hereby promises to
pay to the order of the Bank,  at any of its banking  offices,  or at such other
places  as Bank may  specify  in  writing  to  Borrower,  the  principal  sum of
Seventeen  Million  Dollars  ($17,000,000),  or if less,  the  aggregate  unpaid
principal amount of all advances made by Bank to Borrower. Bank shall maintain a
record of amounts of  principal  and interest  payable by Borrower  from time to
time,  and the records of Bank  maintained  in the  ordinary  course of business
shall be prima facie  evidence of the  existence  and amounts of the  Borrower's
obligations  recorded  therein.  In addition,  Bank may mail or deliver periodic
statements to Borrower  indicating the date and amount of each advance hereunder
(but any failure to do so shall not relieve  Borrower of the obligation to repay
any advance). Unless Borrower questions the accuracy of an entry on any periodic
statement  within fifteen  business days after such mailing or delivery by Bank,
Borrower  shall be deemed to have accepted and be obligated by the terms of each
such periodic statement as accurately  representing the advances  hereunder.  In
the  event of  transfer  of this  Revolving  Line  Note,  or if the  Bank  shall
otherwise deem it  appropriate,  Borrower  hereby  authorizes Bank to endorse on
this  Revolving  Line Note the amount of  advances  and  payments to reflect the
principal  balance  outstanding from time to time. Bank is hereby  authorized to
honor borrowing and other requests  received from purported  representatives  of
Borrower orally, by telecopy,  in writing, or otherwise.  Oral requests shall be
conclusively  presumed  to have been made by an  authorized  person  and  Bank's
crediting of Borrower's  account with the amount  requested  shall  conclusively
establish Borrower's obligation to repay the amount advanced.

     Interest. All outstanding amounts under this Revolving Line Note shall bear
interest  until  paid in full at the Base  Rate  plus the  Applicable  Base Rate
Margin.  Changes in the rate of interest  applicable to this Revolving Line Note
shall become effective  automatically  and without notice at the time of changes
in the Base Rate.
<PAGE>
     The  Borrower,  however,  at least three  business  days prior to each Rate
Change  Date  may  notify  the Bank of its  election  to have a  portion  of the
outstanding  principal  amount under this  Revolving Line Note (which must be at
least  $1,000,000  and must be an  increment of  $100,000)  bear  interest for a
one-month,  three-month, or six month period commencing on such Rate Change Date
at the LIBOR Rate plus the Applicable LIBOR Margin.

     Interest shall be calculated based on actual days elapsed divided by a year
of 360 days.  Interest shall continue to accrue after maturity,  including after
acceleration  and  judgment,  at the rate required by this  Revolving  Line Note
until this  Revolving  Line Note is paid in full.  The rate of  interest on this
Revolving  Line Note may be increased  under the  circumstances  provided in the
Credit  Agreement.  The right of Bank to receive such increased rate of interest
shall not constitute a waiver of any other right or remedy of Bank.

     Payments.  Payments of all accrued  interest under this Revolving Line Note
shall be due and payable on the first day of each month.

     All remaining  outstanding  principal and accrued interest shall be due and
payable in full on the Revolving Line Termination Date.

     All payments  shall be in lawful money of the United States in  immediately
available  funds.  Unless canceled in writing by Borrower,  Borrower  authorizes
Bank to debit its  accounts at Bank to make  payments  due  hereunder,  but such
authority  shall not relieve  Borrower of the obligation to assure that payments
are made when due.

     Late  Charge.  This  Revolving  Line Note is  subject  to the late  charges
provided in the Credit Agreement.

     Maximum Rate. All agreements between Borrower and Bank are hereby expressly
limited  so that in no  contingency  or event  whatsoever,  whether by reason of
acceleration  of maturity of the  indebtedness  evidenced  hereby or  otherwise,
shall  the  amount  paid  or  agreed  to be  paid  to  Bank  for  the use or the
forbearance of the indebtedness  evidenced hereby exceed the maximum permissible
under  applicable law. As used herein,  the term "applicable law" shall mean the
law in effect as of the date hereof provided, however that in the event there is
a change in the law which results in a higher permissible rate of interest, then
this Note shall be governed by such new law as of its  effective  date.  In this
regard,  it is  expressly  agreed that it the intent of Borrower and Bank in the
execution, delivery and acceptance of this Note to contract in strict compliance
with the laws of the State of New York from time to time in effect. If, under or
from any circumstances whatsoever, fulfillment of any provision hereof or of any
other documents  between the Borrower and the Bank at the time of performance of
such  provision  shall be due,  shall  involve  transcending  the  limit of such
validity prescribed by applicable law, then the obligation to be fulfilled shall
automatically  be reduced to the limits of such  validity,  and if under or from
circumstances  whatsoever  Bank should ever receive as interest and amount which
would  exceed the highest  lawful  rate,  such amount  which would be  excessive
interest  shall be applied to the reduction of the principal  balance  evidenced
hereby and not to the payment of interest.  This  provision  shall control every
other provision of all agreements between Borrower and Bank.

     Prepayment.  This Revolving  Line Note is freely  prepayable in whole or in
part at any time,  subject to payment of Break Costs, if any, as provided in the
Credit Agreement.

     Holidays.  If this Revolving Line Note or any payment hereunder becomes due
on a day not a Business Day, the due date of this Revolving Line Note or payment
shall be extended to the next succeeding  Business Day, but any interest or fees
shall be calculated based upon the actual time of payment.

     Events of Default.  At Bank's option, this Revolving Line Note shall become
immediately  due and  payable in full,  without  further  presentment,  protest,
notice, or demand, upon the happening of any Event of Default.

     Modification  of Terms.  The terms of this  Revolving  Line Note  cannot be
changed,  nor may this  Revolving  Line Note be  discharged in whole or in part,
except by a writing  executed by Bank. In the event that Bank demands or accepts
partial  payments of this Revolving Line Note,  such demand or acceptance  shall
not be deemed to  constitute  a waiver of the right to demand the entire  unpaid
balance of this  Revolving  Line Note at any time in  accordance  with the terms
hereof.  Any delay or omission by Bank in exercising any rights  hereunder shall
not operate as a waiver of such rights.

     Collection  Costs.  Borrower  on  demand  shall pay all  expenses  of Bank,
including  without  limitation  reasonable  attorneys'  fees, in connection with
enforcement and collection of this Revolving Line Note.

     Miscellaneous.  To the fullest extent  permissible by law,  Borrower waives
presentment,  demand for payment,  protest, notice of nonpayment,  and all other
demands or notices  otherwise  required by law in connection  with the delivery,
acceptance,  performance,  default,  or enforcement of this Revolving Line Note.
Borrower consents to extensions, postponements, indulgences, amendments to notes
and agreements,  substitutions or releases of collateral,  and  substitutions or
releases of other parties  primarily or secondarily  liable herefor,  and agrees
that none of the same shall affect  Borrower's  obligations under this Revolving
Line Note which shall be unconditional.

     Laws.  Borrower  agrees that this  Revolving Line Note shall be governed by
the laws of the State of New York.


                                  DETECTION SYSTEMS, INC.

                                  By: /s/Frank J. Ryan, Secretary & Treasurer


                                  RADIONICS, INC.

                                  By: /s/Frank J. Ryan, Secretary & Treasurer
<PAGE>

                                    EXHIBIT B

                     AMENDED AND RESTATED MORTGAGE LOAN NOTE


$[3,400,000 - to be updated with current balance]             September 30, 1998


     Unless otherwise  expressly  provided herein, all capitalized terms in this
Mortgage  Loan Note shall have the  meanings  given to them in the  Amended  and
Restated  Credit  Facility  Agreement dated as of September 30, 1998 between the
undersigned ("Detection"), Radionics, Inc. and Fleet National Bank (as successor
to Fleet Bank,  "Bank"),  as the same may be  amended,  extended,  replaced,  or
modified from time to time (the "Credit Agreement").

     This Amended and Restated Mortgage Loan Note evidences the same obligations
as evidenced by, and amends and restates in its entirety, the Mortgage Loan Note
dated May 31, 1996 in the original  principal  amount of $3,400,000 given by the
Borrower  to the Bank,  as amended and  restated  by the  Amended  and  Restated
Mortgage  Loan Note  dated June 24,  1997 in the  original  principal  amount of
$3,400,000, given by the Borrower to the Bank.

     FOR VALUE  RECEIVED,  Detection  hereby promises to pay to the order of the
Bank, at any of its banking offices, or at such other places as Bank may specify
in writing  to  Borrower,  the  principal  sum of [Three  Million  Four  Hundred
Thousand Dollars ($3,400,000)].

     Interest. Outstanding principal amounts under this Mortgage Loan Note shall
bear interest until paid in full at the Base Rate plus the Applicable  Base Rate
Margin.  Changes in the rate of interest  applicable  to this Mortgage Loan Note
shall become effective  automatically  and without notice at the time of changes
in the Base Rate.

     Detection,  however,  at least two business  days prior to each Rate Change
Date may notify the Bank of its  election  to have a portion of the  outstanding
principal  amount  under  this  Mortgage  Loan  Note  (which  must  be at  least
$1,000,000  and must be an increment of $100,000) bear interest for a one-month,
three-month,  or six month  period  commencing  on such Rate  Change Date at the
LIBOR Rate plus the Applicable LIBOR Margin.

     Interest shall be calculated based on actual days elapsed divided by a year
of 360 days.

     Interest  shall  continue to accrue after  maturity at the rate required by
this Mortgage Loan Note until this Mortgage Loan Note is paid in full.  The rate
of interest on this Mortgage Loan Note may be increased under the  circumstances
provided in the Credit  Agreement.  The right of Bank to receive such  increased
rate of interest  shall not  constitute a waiver of any other right or remedy of
Bank.
<PAGE>
     Payments.  Payments of all accrued  interest  under this Mortgage Loan Note
shall be due and payable on the first day of each month. In addition, commencing
on October 1,  1998,  principal  payments  of  $20,987.65  each shall be due and
payable on the first day of each month.

     All  Obligations  under and related to this Mortgage Loan Note shall be due
and payable in full on May 31, 2006.

     All payments  shall be in lawful money of the United States in  immediately
available funds. Unless canceled in writing by Detection,  Detection  authorizes
Bank to debit its  accounts at Bank to make  payments  due  hereunder,  but such
authority shall not relieve  Detection of the obligation to assure that payments
are made when due.

     Late  Charge.  This  Mortgage  Loan  Note is  subject  to the late  charges
provided in the Credit Agreement.

     Maximum Rate. All agreements between Borrower and Bank are hereby expressly
limited  so that in no  contingency  or event  whatsoever,  whether by reason of
acceleration  of maturity of the  indebtedness  evidenced  hereby or  otherwise,
shall  the  amount  paid  or  agreed  to be  paid  to  Bank  for  the use or the
forbearance of the indebtedness  evidenced hereby exceed the maximum permissible
under  applicable law. As used herein,  the term "applicable law" shall mean the
law in effect as of the date hereof provided, however that in the event there is
a change in the law which results in a higher permissible rate of interest, then
this Note shall be governed by such new law as of its  effective  date.  In this
regard,  it is  expressly  agreed that it the intent of Borrower and Bank in the
execution, delivery and acceptance of this Note to contract in strict compliance
with the laws of the State of New York from time to time in effect. If, under or
from any circumstances whatsoever, fulfillment of any provision hereof or of any
other documents  between the Borrower and the Bank at the time of performance of
such  provision  shall be due,  shall  involve  transcending  the  limit of such
validity prescribed by applicable law, then the obligation to be fulfilled shall
automatically  be reduced to the limits of such  validity,  and if under or from
circumstances  whatsoever  Bank should ever receive as interest and amount which
would  exceed the highest  lawful  rate,  such amount  which would be  excessive
interest  shall be applied to the reduction of the principal  balance  evidenced
hereby and not to the payment of interest.  This  provision  shall control every
other provision of all agreements between Borrower and Bank.

     Prepayment.  This  Mortgage  Loan Note is freely  prepayable in whole or in
part at any time,  subject to payment of Break Costs, if any, as provided in the
Credit Agreement.

     Holidays.  If this Mortgage Loan Note or any payment  hereunder becomes due
on a Saturday, Sunday or other holiday on which the Bank is authorized to close,
the due date of this Mortgage Loan Note or payment shall be extended to the next
succeeding business day, but any interest or fees shall be calculated based upon
the actual time of payment.
<PAGE>
     Events of Default.  At Bank's option,  this Mortgage Loan Note shall become
immediately due and payable in full upon the happening of any Event of Default.

     Modification  of Terms.  The  terms of this  Mortgage  Loan Note  cannot be
changed,  nor may this  Mortgage  Loan Note be  discharged  in whole or in part,
except by a writing  executed by Bank. In the event that Bank demands or accepts
partial payments of this Mortgage Loan Note, such demand or acceptance shall not
be deemed to  constitute  a waiver of the  right to  demand  the  entire  unpaid
balance  of this  Mortgage  Loan Note at any time in  accordance  with the terms
hereof.  Any delay or omission by Bank in exercising any rights  hereunder shall
not operate as a waiver of such rights.

     Collection  Costs.  Detection  on demand  shall pay all  expenses  of Bank,
including  without  limitation  reasonable  attorneys'  fees, in connection with
enforcement and collection of this Mortgage Loan Note.

     Miscellaneous.  To the fullest extent  permissible by law, Detection waives
presentment,  demand for payment, protest, notice of non-payment,  and all other
demands or notices  otherwise  required by law in connection  with the delivery,
acceptance,  performance,  default,  or  enforcement of this Mortgage Loan Note.
Detection  consents to  extensions,  postponements,  indulgences,  amendments to
notes and agreements, substitutions or releases of collateral, and substitutions
or releases of other parties primarily or secondarily liable herefor, and agrees
that none of the same shall affect  Detection's  obligations under this Mortgage
Loan Note which shall be unconditional.

     Laws.  Detection  agrees that this  Mortgage Loan Note shall be governed by
the laws of the State of New York.


                            DETECTION SYSTEMS, INC.

                            By: /s/Frank J. Ryan, Secretary & Treasurer

<PAGE>
                       AMENDED AND RESTATED TERM LOAN NOTE


$14,350,000                                                   September 30, 1998


     Unless otherwise  expressly  provided herein, all capitalized terms in this
Term Loan Note shall have the meanings given to them in the Amended and Restated
Credit Facility Agreement dated as of September 30, 1998 between the undersigned
("Detection"),  Radionics,  Inc. and Fleet  National Bank (as successor to Fleet
Bank, "Bank"), as the same may be amended, extended,  replaced, or modified from
time to time (the "Credit Agreement").

     This  Amended and  Restated  Term Loan Note,  in part,  evidences  the same
obligations  as evidenced by, and amends and restates in its entirety,  the Term
Loan Note dated May 31, 1996 in the  original  principal  amount of  $14,350,000
given by the  Borrower to the Bank,  as amended and  restated by the Amended and
Restated Term Loan Note dated June 24, 1997 given by the Borrower to the Bank.

     FOR VALUE  RECEIVED,  Detection  hereby promises to pay to the order of the
Bank, at any of its banking offices, or at such other places as Bank may specify
in writing to Borrower,  the  principal  sum of Fourteen  Million  Three Hundred
Fifty Thousand Dollars ($14,350,000).

     Interest.  Outstanding  principal  amounts  under this Term Loan Note shall
bear interest until paid in full at the Base Rate plus the Applicable  Base Rate
Margin.  Changes in the rate of interest applicable to this Term Loan Note shall
become effective  automatically and without notice at the time of changes in the
Base Rate.

     Detection,  however,  at least two business  days prior to each Rate Change
Date may notify the Bank of its  election  to have a portion of the  outstanding
principal  amount  under this Term Loan Note (which must be at least  $1,000,000
and  must  be  an  increment  of  $100,000)   bear  interest  for  a  one-month,
three-month,  or six month  period  commencing  on such Rate  Change Date at the
LIBOR Rate plus the Applicable LIBOR Margin.
<PAGE>

     Interest shall be calculated based on actual days elapsed divided by a year
of 360 days.

     Interest  shall  continue to accrue after  maturity at the rate required by
this  Term  Loan Note  until  this  Term Loan Note is paid in full.  The rate of
interest  on this  Term  Loan  Note may be  increased  under  the  circumstances
provided in the Credit  Agreement.  The right of Bank to receive such  increased
rate of interest  shall not  constitute a waiver of any other right or remedy of
Bank.

     Payments.  Payments of all accrued interest under this Term Loan Note shall
be due and payable on the first day of each month.  In addition,  commencing  on
March 1, 2000,  principal  payments of $217,424.24 each shall be due and payable
on the first day of each month.

     All  Obligations  under and related to this Term Loan Note shall be due and
payable in full on September 30, 2005.

     All payments  shall be in lawful money of the United States in  immediately
available funds. Unless canceled in writing by Detection,  Detection  authorizes
Bank to debit its  accounts at Bank to make  payments  due  hereunder,  but such
authority shall not relieve  Detection of the obligation to assure that payments
are made when due.

     Late Charge. This Term Loan Note is subject to the late charges provided in
the Credit Agreement.

     Maximum Rate. All agreements between Borrower and Bank are hereby expressly
limited  so that in no  contingency  or event  whatsoever,  whether by reason of
acceleration  of maturity of the  indebtedness  evidenced  hereby or  otherwise,
shall  the  amount  paid  or  agreed  to be  paid  to  Bank  for  the use or the
forbearance of the indebtedness  evidenced hereby exceed the maximum permissible
under  applicable law. As used herein,  the term "applicable law" shall mean the
law in effect as of the date hereof provided, however that in the event there is
a change in the law which results in a higher permissible rate of interest, then
this Note shall be governed by such new law as of its  effective  date.  In this
regard,  it is  expressly  agreed that it the intent of Borrower and Bank in the
execution, delivery and acceptance of this Note to contract in strict compliance
with the laws of the State of New York from time to time in effect. If, under or
from any circumstances whatsoever, fulfillment of any provision hereof or of any
other documents  between the Borrower and the Bank at the time of performance of
such  provision  shall be due,  shall  involve  transcending  the  limit of such
validity prescribed by applicable law, then the obligation to be fulfilled shall
automatically  be reduced to the limits of such  validity,  and if under or from
circumstances  whatsoever  Bank should ever receive as interest and amount which
would  exceed the highest  lawful  rate,  such amount  which would be  excessive
interest  shall be applied to the reduction of the principal  balance  evidenced
hereby and not to the payment of interest.  This  provision  shall control every
other provision of all agreements between Borrower and Bank.

     Prepayment. This Term Loan Note is freely prepayable in whole or in part at
any time,  subject to payment of Break Costs,  if any, as provided in the Credit
Agreement.

     Holidays.  If this Term Loan Note or any payment hereunder becomes due on a
Saturday,  Sunday or other holiday on which the Bank is authorized to close, the
due  date of this  Term  Loan  Note or  payment  shall be  extended  to the next
succeeding business day, but any interest or fees shall be calculated based upon
the actual time of payment.

     Events of  Default.  At Bank's  option,  this Term Loan Note  shall  become
immediately due and payable in full upon the happening of any Event of Default.
<PAGE>
     Modification of Terms.  The terms of this Term Loan Note cannot be changed,
nor may this  Term  Loan  Note be  discharged  in whole or in part,  except by a
writing  executed  by Bank.  In the event that Bank  demands or accepts  partial
payments of this Term Loan Note,  such demand or acceptance  shall not be deemed
to constitute a waiver of the right to demand the entire unpaid  balance of this
Term Loan Note at any time in  accordance  with the terms  hereof.  Any delay or
omission  by Bank in  exercising  any rights  hereunder  shall not  operate as a
waiver of such rights.

     Collection  Costs.  Detection  on demand  shall pay all  expenses  of Bank,
including  without  limitation  reasonable  attorneys'  fees, in connection with
enforcement and collection of this Term Loan Note.

     Miscellaneous.  To the fullest extent  permissible by law, Detection waives
presentment,  demand for payment, protest, notice of non-payment,  and all other
demands or notices  otherwise  required by law in connection  with the delivery,
acceptance,  performance,  default,  or  enforcement  of this  Term  Loan  Note.
Detection  consents to  extensions,  postponements,  indulgences,  amendments to
notes and agreements, substitutions or releases of collateral, and substitutions
or releases of other parties primarily or secondarily liable herefor, and agrees
that none of the same shall affect Detection's  obligations under this Term Loan
Note which shall be unconditional.

     Laws.  Detection  agrees  that this Term Loan Note shall be governed by the
laws of the State of New York.


                                 DETECTION SYSTEMS, INC.

                                 By: /s/Frank J. Ryan, Secretary & Treasurer




                    AMENDMENT NO. 1 TO EMPLOYMENT AGREEMENT

     THIS AMENDMENT is made as of the 23h day of October,  1998, between Karl H.
Kostusiak ("Executive") and Detection Systems, Inc. ("Company").

     The parties  entered into an Employment  Agreement dated July 14, 1998 (the
"Employment  Agreement")  and  a  Non-Competition,  Disability,  and  Retirement
Agreement  dated the same date (the  "Non-Competition  Agreement").  Desiring in
this  Amendment No. 1 to set forth certain  agreed  amendments to the Employment
Agreement  and the  Non-Competition  Agreement,  the  parties  hereby  agree  as
follows:

     1.  Amendment  of Section  7(b) of  Employment  Agreement  . The portion of
Section 7(b) of the Employment  Agreement appearing before subsection 7(b)(1) is
hereby amended in its entirety to read as follows:

            "(b)  If:

                    (i)  any Change in Control of the Company  occurs while this
                         Agreement is effective, and

                    (ii) Executive  gives  notice to the  Company or the Company
                         (acting upon a determination of its Board of Directors)
                         gives notice to Executive, in either case to the effect
                         that the six month  period  called for by this  Section
                         7(b) shall begin to run, and

                    (iii)Executive's  employment  is  terminated by Executive or
                         by the  Company  (other than for  Executive's  death or
                         disability) within six months after the date the notice
                         provided for in (ii) above is received (in  Executive's
                         case the termination being effected by Executive giving
                         notice within that six month period,  effective  within
                         30 days after the notice is given,  that his employment
                         is  terminated),  regardless  the reason,  if any,  and
                         regardless  which party gave the notice provided for in
                         (ii) above, then the Company shall pay,  transfer,  and
                         provide to Executive the following  amounts,  benefits,
                         and assets:"


     2. Amendment of Section 4 of Non-Competition Agreement. The first paragraph
of Section 4 of the  Non-Competition  Agreement is hereby amended to read in its
entirety as follows:
<PAGE>

          "4. Consulting Services.  If this Agreement becomes effective upon the
     occurrence of any contingency set forth in Section 19 other than subsection
     19(b) or (c),  beginning upon the date of that  occurrence  Executive shall
     hold himself available to the Company for providing  consulting services to
     it as an independent contractor at mutually agreeable times and places; and
     the  Company  shall  have the  right  to call  upon  Executive,  so long as
     Executive  is able,  for up to 8 days of  consulting  services  per year to
     provide information  concerning matters that occurred,  were developed,  or
     were determined  while  Executive was a full-time or part-time  employee of
     the Company.  Unless otherwise agreed,  those consulting  services shall be
     rendered  at a place  and time  mutually  agreed  (but  within  25 miles of
     Executive's  residence at the time) and shall be paid at the rate of $1,500
     per day (or up to 100 hours of  consulting  services  per year at an hourly
     rate to be agreed upon).  Any other  consulting  services shall be provided
     if, as, and when the parties may agree."


     3.  Amendment  of Section 9 of  Non-Competition  Agreement.  The portion of
Section 9 of the  Non-Competition  Agreement appearing before subsection 9(b) is
hereby amended to read in its entirety as follows:

          "9.  Retirement.  The Company hereby agrees that, if not ended sooner,
     the Term of Service as used in the  Employment  Agreement  shall end at the
     close of business on December 31 of the year in which Executive attains the
     age of 68, and  beginning  on the  opening of  business on January 1 of the
     next year (and  regardless  whether the Term of Service ended prior to that
     December  31), the Company will pay Executive  retirement  benefits for his
     lifetime  and for his spouse's  lifetime,  if his spouse  survives  him, as
     follows:  
          (a) a  retirement  wage  benefit  initially  equal  to 20% of the base
     salary rate being paid to Executive at the end of his full time  employment
     with the  Company,  increased  for each year after the end of his full time
     employment by any increase in the CPI (as defined  below),  except that the
     retirement  wage benefit  shall be equal to 60% of that base salary rate at
     the end of  Executive's  full time  employment  with the Company,  plus CPI
     increases,  effective for any retirement year after a Change in Control and
     after either  Executive is no longer a full time employee of the Company or
     Executive  or the  Company  has given the  notice  provided  for in Section
     20(b)(ii) below, and except that the retirement wage benefit for his spouse
     shall be 75% of the amount thus  calculated for each year after the year of
     Executive's death;"
<PAGE>

            [Note that Section 20(b)(ii) is added in Section 4 below.]

Also, a new subsection (d) shall be added to Section 9, which shall read in
its entirety as follows:

            "(d)  The  retirement  benefits  provided under this Section 9 (and,
      if  applicable,  Section 10) shall be paid as provided  herein  regardless
      whether the Company has any claims  against  Executive  for default  under
      this Agreement or for any other breach of duty or otherwise,  and,  except
      as  otherwise  provided in Section 7 above,  the  Company  shall pay those
      retirement  benefits as provided  and must  pursue  remedies  for any such
      default  or  other   breach  of  duty  or  other  claim   separately   and
      independently."


     4.  Amendment of Section 20 of  Non-Competition  Agreement.  The portion of
Section  20(b) of the  Non-Competition  Agreement  appearing  before  subsection
20(b)(1) is hereby amended in its entirety to read as follows:

            "(b)  If:
                    (i)  any Change in Control of the Company  occurs while this
                         Agreement is effective, and

                    (ii) Executive  gives  notice to the  Company or the Company
                         (acting upon a determination of its Board of Directors)
                         gives notice to Executive, in either case to the effect
                         that the six month  period  called for by this  Section
                         20(b) shall begin to run, and

                    (iii)Executive's   consulting  services  are  terminated  by
                         Executive or by the Company (other than for Executive's
                         death or  disability)  within six months after the date
                         the notice  provided  for in (ii) above is received (in
                         Executive's  case the  termination  being  effected  by
                         Executive  giving  notice within that six month period,
                         effective  within 30 days  after  the  notice is given,
                         that his  consulting  services  are  terminated  to the
                         extent permitted under Section 4 above), regardless the
                         reason,  if any,  and  regardless  which party gave the
                         notice  provided  for in (ii)  above,  then the Company
                         shall  pay,  transfer,  and  provide to  Executive  the
                         following amounts, benefits, and assets:"

     5.  Continuation  of Agreements The parties  acknowledge and agree that, as
amended  by  this   Amendment   No.  1,  the   Employment   Agreement   and  the
Non-Competition  Agreement  remain  binding and in full force and effect between
the Company and Executive.

     IN WITNESS  WHEREOF the Company and Executive  have executed this Amendment
No. 1 as of the date set forth above.


                                        /s/Karl H. Kostusiak, Executive


                                        DETECTION SYSTEMS, INC.

                                        By: /s/Donald R. Adair, Chairman of
                                        the Compensation Committee of
                                        the Board of Directors


   PART-TIME EMPLOYMENT, NON-COMPETITION, DISABILITY, AND RETIREMENT AGREEMENT


      AGREEMENT  made as of the  23rd  day of  October,  1998  between  David B.
Lederer  ("Executive")  and  Detection  Systems,  Inc.,  a New York  corporation
("Company").   It  is  the  intent  that  this   Agreement  will  supersede  the
Part-Time  Employment  Agreement,  dated August 15, 1997, which became effective
April 2, 1998.
                                  WITNESSETH:
      In  consideration of the mutual covenants  contained  herein,  the parties
agree as follows:

            1.    Effectiveness  and Terms.  This Agreement  shall be binding on
the parties as of its date set forth  above (the  "Commencement  Date"  herein).
"Term of  Employment"  as used herein  shall mean the period  commencing  on the
Commencement Date and continuing  thereafter  through December 31 of the year in
which  Executive's 68th birthday occurs,  unless the Company and Executive agree
in  writing  to  extend  the  Term of  Employment,  in  which  case  the Term of
Employment  shall  have  the  meaning  as  determined  at that  time;  provided,
however,  that  Executive's  employment  services may be earlier  terminated  as
hereinafter  expressly set forth or as may be agreed  between  Executive and the
Company,  in which event the Term of  Employment  shall mean the period from the
Commencement  Date  through  the date of such  earlier  termination  (but such a
termination  shall  not  affect   Executive's   obligation  to  provide  minimum
consulting services as provided in Section 5 below).
<PAGE>

      2.    Non-Competition.  During  any  period  (a)  in  which  Executive  is
being paid  currently  for  employment  services as provided in Section 4 below,
(b) in which  Executive is being paid currently the  compensation  called for by
Section 3 below,  (c) in which  Executive is being paid currently for disability
benefits  as  provided  under  Section 11 below,  or (d) in which  Executive  is
being paid currently for  retirement  benefits as provided under Section 9 or 10
below,  Executive  shall not,  without the prior written consent of the Board of
Directors  of  the  Company,  engage,  as  an  employee,  partner,   consultant,
venturer,  entrepreneur,  or  otherwise,  in  the  development  or  sale  of any
product or service  which is  competitive  with any  product or service  sold or
under active development by the Company during the Term of Employment.

      3.    Compensation  for  Non-Competition.  After  the  Term of  Employment
has ended,  in  consideration  for  Executive's  non-competition  as provided in
Section 2 above,  the Company  shall pay and provide to Executive  the following
compensation  and benefits  through  December 31 of the year in which  Executive
attains the age of 68:
      (a)   An annual  non-competition  fee equal to or greater  than  $120,000,
that  fee to be  increased  each  year if and to the  extent  the  CPI  (defined
below)  has  increased  during  the  preceding  year  (and any fees  earned as a
director  of the  Company  shall be  credited  to that fee),  which fee shall be
paid in full on January 2 of each year;
      (b)   The  Executive  will  not   participate  in  any  of  the  Company's
executive  incentive  compensation plans except for any such plan or plans which
expressly refer to this Agreement;
      (c)   Grants of options  under any Company  stock option plan that permits
such  options,  in such amounts as are  determined  by the Board of Directors or
the Committee of the Board administering the plan;
      (d)   Participation   in   Company   pension,    deferred    compensation,
insurance,  health and welfare and other  benefit plans in effect on the date of
this Agreement; and
      (e)   Continuation  of all  plans in  which  the  Executive  participates,
including   existing  fringe   benefits  and  executive   perquisites  to  which
Executive  is  entitled  as of the date  immediately  prior to the  Commencement
Date under this Agreement.
      Beginning on the January 1 after the year in which  Executive  attains the
age of 68, the  retirement  benefits  set forth in Sections 9 and 10 below shall
be the full consideration to be paid to Executive for his non-competition.
<PAGE>

      4.    Employment.  The Company  hereby  employs  Executive in the capacity
of Vice President,  Business  Development for the Term of Employment  commencing
on the  Commencement  Date.  The Company  agrees to provide  Executive with such
offices and such  operational and  administrative  support as is consistent with
his position and  responsibilities  under this Agreement.  The  compensation and
benefits which the Company shall provide  Executive for his services  during the
Term of Employment  shall include,  but not be limited to, (a) base salary equal
to or greater than $130,286  (including  directors  fees, if applicable) and (b)
the  benefits  listed in  clauses  (b),  (c),  (d),  and (e) of Section 3 above.
Executive  agrees  that he will  devote  approximately  half  time  and his best
efforts  during  reasonable  business  hours to  performance  of the  duties and
responsibilities  of his office during the Term of  Employment.  Executive  also
agrees not to disclose  trade secrets of the Company,  or to engage in any other
activity which is  detrimental to the interests of the Company,  during the Term
of Employment.
      Notwithstanding  any of the other  provisions of this Agreement,  the Term
of  Employment  will   automatically   terminate  upon  Executive's   death  and
thereupon  all payments and  non-vested  benefits  payable  hereunder  and under
Section 3 above shall  cease,  except for any death  benefits  and any  survivor
benefits for his spouse which are provided  under the Company's  employee  plans
and  except  for  the  retirement  benefits  set  forth  in  Section  9 for  any
surviving  spouse.  Those retirement  benefits shall be paid pursuant to Section
9 commencing after  Executive's  68th birthday would have occurred,  except that
the  surviving  spouse  may  elect,  by written  notice  given to the  Company's
President or  Secretary,  to receive  early  retirement  benefits as provided in
Section 10 below,  in which case the  provisions of Section 9 below shall apply,
except  that  the  initial  retirement  wage  benefit  shall  be  calculated  as
provided in Section 10.
      The  Company  may  terminate   Executive's  services  due  to  Executive's
permanent  disability,  as  determined  by the Board of  Directors in good faith
based on the  certification  of an independent  M.D., and thereupon all payments
and  non-vested  benefits  under this Section 4 and under  Section 3 shall cease
except that the disability  and retirement  benefits shall be paid in accordance
with the provisions of Sections 9, 10, and 11 below.

      5.    Minimum  Consulting  Services.  After a termination  of  Executive's
services  pursuant to Section 7, 8, or 9 below,  the Company shall  nevertheless
have the right to call upon  Executive,  so long as Executive is able, for up to
8 days of  consulting  services  per  year  to  provide  information  concerning
matters that occurred,  were developed,  or were determined  while Executive was
a full-time  or  part-time  employee of the Company.  Unless  otherwise  agreed,
these  consulting  services  shall be  rendered  at a place  and  time  mutually
agreed (but within 25 miles of  Executive's  residence at the time) and shall be
paid at the rate of $1,200  per day (or up to 100 hours of  consulting  services
per year at an hourly rate to be agreed  upon).  Any other  consulting  services
shall be provided if, as, and when the parties may agree.
<PAGE>

      6.    Executive's   Acceptance.    Executive   agrees   to   provide   the
employment and the consulting services described in this Agreement.

      7.    Termination  for  Cause.  The  Company  may  terminate   Executive's
services  immediately  and  without  prior  notice to  Executive  for "Cause" as
defined  below.  The  existence of Cause shall be  determined  by the  Company's
Board of  Directors  (other than  Executive)  acting in good  faith.  "Cause" is
defined,  and shall be limited  to, a good faith  determination  by the Board of
Directors that any of the following has occurred:
      (a)   Executive has knowingly  misappropriated  for his benefit a material
amount of funds or property of the Company;
      (b)   Executive has obtained a material  personal  profit from any illegal
Company transaction with a third party;
      (c)   Executive  has obtained a material  personal  profit from the use of
the Company's trade secrets other than on its behalf; or
      (d)   The Company has  suffered  material  financial  harm from  knowingly
illegal  action  by  Executive  other  than on the  Company's  behalf or for its
benefit.
      If  Executive's  services  are  terminated  by the Company  for Cause,  he
shall continue to be paid compensation and benefits for his  non-competition  in
accordance  with the provisions of Section 3 above,  for any minimum  consulting
services  provided  pursuant  to Section 5 above,  and  retirement  benefits  in
accordance with Section 9 and, if elected,  Section 10 below,  provided that his
cash compensation  (including  retirement  benefit payments to be provided under
this  Agreement)  shall be reduced by the amount of any monetary damage suffered
by the  Company  due  to the  Cause,  as  determined  by a  court  of  competent
jurisdiction,  prorated  over  the  actuarially  determined  term  of  all  such
payments beginning on such determination.

      8.    Resignation.  If, at any time  prior to  Executive's  retirement  as
provided  in Section 9 below,  Karl H.  Kostusiak  is no longer  employed as the
full time senior  executive  officer of the  Company,  Executive  shall have the
option of resigning  from his  employment  obligations  under  Section 4 of this
Agreement  by giving  written  notice  thereof  to the  Company's  President  or
Secretary,  but no resignation  shall affect  Executive's  obligation to provide
the minimum consulting services provided for in Section 5 above.
<PAGE>

      9.    Retirement.  The Company  hereby  agrees that,  if not ended sooner,
the Term of  Employment  as used in this  Agreement  shall  end at the  close of
business on December  31 of the year in which  Executive  attains the age of 68,
and  beginning  on the  opening of  business  on January 1 of the next year (and
regardless  whether the Term of  Employment  ended prior to that  December  31),
the Company  will pay  Executive  retirement  benefits  for his lifetime and for
his spouse's lifetime, if his spouse survives him, as follows:
      (a)   a  retirement  wage  benefit  initially  equal  to 20%  of the  base
salary  rate  being  paid to  Executive  at the end of his full time  employment
with  the  Company,  increased  for each  year  after  the end of his full  time
employment  by any  increase  in the CPI (as  defined  below),  except  that the
retirement  wage  benefit  shall be equal to 60% of that base salary rate at the
end of Executive's  full time employment  with the Company,  plus CPI increases,
effective  for any  retirement  year  after a Change  in  Control  and after the
conditions  described  in Section  20(b)(ii)  below have  occurred  which  would
allow  Executive  to  give  the  notice   described  there   (disregarding   his
retirement,  if any),  and  except  that the  retirement  wage  benefit  for his
spouse shall be 75% of the amount thus  calculated  for each year after the year
of Executive's death;
      (b)   continuation  of  Executive's  participation  (for  himself  and his
spouse)  in  the  health  program  in  effect  on the  date  of  this  Agreement
(including for dental and eye care  coverage,  an annual  physical  examination,
and similar benefits); and
      (c)   continuation  of all other benefits  provided at time of retirement,
such  continuation  limited in  individual  benefit  cost to 60% of the  maximum
annual  cost  of  such  benefit  in any  year  prior  to  retirement,  plus  CPI
increases,

      For these purposes:
            (1)   unless  otherwise  agreed  or  directed  by  law  or a  court,
"spouse"  shall  mean the  person to whom  Executive  is married at the time any
benefit  is to be  paid,  or,  after  Executive's  death,  the  person  to  whom
Executive was married at the time of his death;
            (2)   "CPI"  shall mean the  Consumer  Price  Index,  all Urban Wage
Earners  as  determined  by the United  States  Department  of Labor,  Bureau of
Labor  Statistics,  or any successor  governmental  agency or,  lacking any such
successor,  any  other  authoritative  source  designated  in good  faith by the
Board of  Directors;  and the wage  benefit  shall be  increased as of January 1
each year by  multiplying  the wage benefit paid during the previous year by any
fraction  greater  than  one  calculated  by  dividing  the  CPI  most  recently
computed  and  available  at the end of  that  previous  year  by the  CPI  most
recently  computed and  available at the end of the year  previous to that;  the
CPI shall not be used to decrease the wage benefit.
      The parties  agree:  (x) that the  foregoing  retirement  benefits  are in
addition to any other  retirement  benefits  that may be  available to Executive
(such  as the  Company's  401(k)  savings  plan),  (y)  that  payment  of  these
retirement  benefits  may  be  terminated  if a  court  of law  determines  that
Executive  has  violated  the  provisions  of Section 2 above,  and (z) that the
Company  will  purchase  and  maintain  life  insurance  sufficient  to fund the
estimated  benefits for Executive's  spouse (estimated no later than Executive's
retirement  date;  any excess  policy  proceeds to be available,  if agreed,  to
purchase  shares of the Company's  Common Stock held in Executive's  estate) and
the policy or policies of such insurance  shall be held in trust  designated for
this purpose.
<PAGE>
      (d)   The  retirement  benefits  provided  under this  Section 9 (and,  if
applicable,  Section 10) shall be paid as  provided  herein  regardless  whether
the Company has any claims  against  Executive for default under this  Agreement
or for  any  other  breach  of duty  or  otherwise,  and,  except  as  otherwise
provided in Section 7 above,  the Company  shall pay those  retirement  benefits
as provided  and must pursue  remedies  for any such  default or other breach of
duty or other claim separately and independently.

      10.  Early   Retirement   Benefits.   The  parties   agree  that,  in  the
circumstances   expressly   provided  in  this   Agreement,   Executive   and/or
Executive's  spouse shall be paid early  retirement  benefits in accordance with
the following:
      (a) The  provisions  of  Section  9 shall  apply  to  Executive's  and the
spouse's retirement  benefits as provided therein,  except as expressly modified
by this  Section  10,  and shall be paid  beginning  at the time  payment of the
early retirement benefits actually commences as provided in this Agreement;
      (b) The  initial  retirement  wage  benefit  shall not be the  amount  set
forth in Section 9(a) above,  but shall be calculated  as follows:  multiply the
initial  retirement  wage benefit  (calculated  in accordance  with Section 9(a)
above) by the  actuarially  determined  number of years it would be paid  during
Executive's then  actuarially  determined  remaining  lifespan as if Executive's
68th birthday had just occurred;  then divide that amount by the number of years
then  actuarially   determined  to  be  Executive's  actual  expected  remaining
lifespan  based on his  actual  age at that time.  The  amount  thus  calculated
shall be the initial  annual  retirement  wage  benefit for  purposes of Section
9(a) above.

      11.  Disability.  If Executive is  determined to be  permanently  disabled
in accordance  with the provisions of Section 4 above,  Executive  shall be paid
disability  benefits  from that date  through  December  31 of the year in which
Executive  attains the age of 68, which  disability  benefits  shall be equal to
the  non-competition  compensation  and  benefits and the salary that would have
been paid to  Executive  pursuant to Sections 3 and 4 above if he had not become
disabled,  provided  that,  to the extent the  disability  wage benefits are not
taxable  income to Executive  under the U.S.  Internal  Revenue Code of 1986, as
amended,  the disability  benefit amount shall equal 60% of the compensation and
salary that would have been paid pursuant to Sections 3 and 4 above.

      12. Stock  Transfers by Executive  and  Executive's  Estate and Heirs.  So
long as this  Agreement  is in  effect,  Executive  shall not sell any shares of
Company  Common  Stock  except (a) in  transactions  approved  in advance by the
Company's  Board of Directors or (b) pursuant to all the  conditions of Rule 144
promulgated by the Securities and Exchange  Commission  under the Securities Act
of 1933, as amended (or any rule thus  promulgated  which is a successor to Rule
144);  provided,  however,  that no such sales  shall be made in any block trade
or when there is any plan,  program,  or tender  offer  announced  by any person
other than the  Company  to acquire  shares of the  Company's  Common  Stock and
that person was  required to file a  statement,  schedule,  or other report with
respect thereto with the U.S.  Securities and Exchange  Commission under Section
13 or 14 of the  Securities  Exchange Act of 1934, as amended,  or the rules and
regulations  thereunder.  Executive  agrees that restrictive  legends  referring
to the  provisions  of this  Section  12 shall be placed  upon all  certificates
representing  shares to which this Section 12 applies.  The  provisions  of this
Section 12 shall  terminate  upon any Change in  Control or  Executive's  death,
whichever may first occur and shall not apply thereafter.
<PAGE>
      13.   Expenses  and  Interest.  If the  Company  is  found  by a court  of
competent  jurisdiction to have breached this  Agreement,  the Company shall pay
the costs  and  expenses  (including  reasonable  attorneys  fees)  incurred  by
Executive  in any  litigation  seeking  damages in respect of such  breach or to
enforce the  performance  of this  Agreement by Company,  together with interest
on each  installment  of wages or benefits  paid late by the Company  calculated
to the date of actual  payment at an annual  rate  equal to 3% over the  highest
rate then paid by the Company under its short term borrowing  arrangements  with
an  independent  institutional  lender (and if there is no such lender,  then 4%
above the prevailing prime rate as reported in the Wall Street Journal).

      14.   Notices.  Any notice  required or  permitted  to be given  hereunder
shall be in  writing  and may be  delivered  personally  or  given  by  prepaid,
certified, return receipt requested, first class mail addressed:
      (a)   if to  the  Company,  to at  least  two  members  of  the  Board  of
Directors,  c/o  the  Company's  Secretary  at  the  address  of  the  Company's
principal office;
      (b)   if to  Executive,  at his  home  mailing  address  on file  with the
Company; and
      (c)   to such other  address  as the party to which  such  notice is to be
given shall have  notified (in  accordance  with the  provisions of this Section
14) as its substitute address for the purpose of this Agreement.
      Any notice given as aforesaid  shall be deemed  conclusively  to have been
received on the fifth business day after such mailing.

      15.   Amendment.  It is  agreed  that no change  or  modification  of this
Agreement shall be made except in a writing signed by both parties.

      16.   Severability.  In the event  that any one or more of the  provisions
of this Agreement shall be or become invalid,  illegal,  or unenforceable in any
respect,   the  validity,   legality,   and   enforceability  of  the  remaining
provisions shall not be affected thereby.

      17.   Law  Governing.  The  validity,  interpretation,  and effect of this
Agreement shall be governed by the laws of the State of New York.
<PAGE>

      18.   Entire    Agreement.    This    Agreement    contains   the   entire
understanding  of the parties  with  respect to the  employment  of Executive by
the Company during the Term of Employment  and with respect to  non-competition,
minimum  consulting,  and  disability  and  retirement  benefits  (but  does not
affect  pension and other  benefit  plans and  arrangements  in which  Executive
participates).  There are no  restrictions,  agreements,  promises,  warranties,
covenants,  or  undertakings  other than those  expressly  set forth herein with
respect to the Term of Employment.  As of the  Commencement  Date this Agreement
supersedes all prior agreements,  arrangements,  and understandings  between the
parties,  whether oral or written,  with  respect to  employment  or  consulting
services of Executive on and after the Commencement Date.

      19.   [Intentionally left blank]

      20.   Change in Control.
      (a) A "Change in Control" of the Company  shall be deemed to have occurred
          if:
                  (1)   any  "person,"  as such term is used in  Sections  13(d)
            and 14(d) of the  Securities  Exchange Act of 1934,  as amended (the
            "Exchange  Act") (other than the Company or any  corporation  owned,
            directly  or  indirectly,  by the  shareholders  of the  Company  in
            substantially  the same  proportions as their  ownership of stock of
            the Company),  is or becomes the  "beneficial  owner" (as defined in
            Rule 13d-3  under the  Exchange  Act),  directly or  indirectly,  of
            securities of the Company  representing  25% or more of the combined
            voting power of the Company's then outstanding securities;
                  (2)   there  is  elected  35% or  more of the  members  of the
            Board of  Directors  of the  Company  without  the  approval  of the
            nomination  of such  members  by a  majority  of the  Board  serving
            prior to such election;
                  (3)   the  shareholders  of the  Company  approve  a merger or
            consolidation  of the  Company  with any  other  corporation,  other
            than  (i) a  merger  or  consolidation  which  would  result  in the
            voting  securities  of the  Company  outstanding  immediately  prior
            thereto  continuing  to  represent  more  than  75% of the  combined
            voting  power  of the  voting  securities  of the  Company,  or such
            surviving  entity,  outstanding  immediately  after  such  merger or
            consolidation;  or  (ii)  a  merger  or  consolidation  effected  to
            implement   a   recapitalization   of  the   Company   (or   similar
            transaction)  in which no "person" (as defined above)  acquires more
            than  25%  of  the   combined   voting   power   of  the   Company's
            then-outstanding securities; or
                  (4)   The  shareholders  of the Company  approve an  agreement
            for  the   sale  or   disposition   by  the   Company   and  all  or
            substantially all of the Company's assets.
<PAGE>
      (b)   If:

          (i)  any Change in Control of the Company  occurs while this Agreement
               is effective, and

          (ii) Executive gives notice to the Company or the Company (acting upon
               a  determination  of its  Board of  Directors)  gives  notice  to
               Executive, in either case to the effect that the six month period
               called for by this subsection  20(b) shall begin to run (provided
               that  Executive  shall  not have the  right to give  that  notice
               unless Karl H.  Kostusiak is no longer  employed as the full time
               senior executive  officer of the Company at the time or he either
               has  consented  in writing  to the  giving of that  notice or has
               given a similar  such  notice for  himself  under his  applicable
               agreement with the Company), and

          (iii)Executive's  employment  is  terminated  by  Executive  or by the
               Company (other than for Executive's  death or disability)  within
               six months  after the date the notice  provided for in (ii) above
               is received (in Executive's  case the termination  being effected
               by  Executive   giving  notice  within  that  six  month  period,
               effective  within  30 days  after the  notice is given,  that his
               employment is terminated to the extent  permitted under Section 8
               above), regardless the reason, if any, and regardless which party
               gave the notice  provided  for in (ii)  above,  

then the Company  shall pay,  transfer,  and provide to Executive  the following
amounts, benefits, and assets:

                  (1)   The  Company   shall  pay  to   Executive   the  sum  of
            Executive's  full  non-competition  compensation  and salary through
            the effective  date of  termination of his employment at the rate in
            effect  at the time of  termination  or at the time  the  Change  in
            Control  occurs,  whichever  is higher,  and an amount  equal to the
            amount  of any bonus  which has been  earned by him but not yet paid
            to him.  These  two  amounts  shall be paid to  Executive  in a lump
            sum within five days  following the effective  date of  termination,
            or in the case of a bonus  which is not readily  calculable  at that
            time, within five days after the bonus can be calculated.
                  (2)   The Company  shall pay to  Executive  an amount equal to
            three  times the  highest  total cash  compensation  (including  any
            base salary,  non-competition compensation,  bonuses, and consulting
            fees) paid  Executive  in any of the  Company's  last  three  fiscal
            years  completed  prior to such  termination.  This amount  shall be
            paid to  Executive  as provided in the last  sentence of  subsection
            (1) above.

<PAGE>
                  (3)   The Company  shall pay to  Executive  an amount equal to
            the total  amounts  that would be  expended  for the  benefits to be
            provided  Executive  under  Section 3 above on the  assumption  that
            Executive will continue to be compensated  for  non-competition  for
            three years  after the  termination.  This  amount  shall be paid to
            Executive as provided in the last sentence of  subsection  (1) above
            either in cash or in the form of an  annuity  contract  issued by an
            independent  insurance  company  licensed to do business in New York
            that will provide payment of all such total amounts.
                  (4)   All options and other  rights  that  Executive  may hold
            to purchase or otherwise  acquire  Common Stock of the Company shall
            immediately  become  exercisable  in full for the  total  number  of
            shares  that are or might  become  purchasable  thereunder,  in each
            case without  further  condition or limitation  except the giving of
            notice  of  exercise   and  the  payment  of  the   purchase   price
            thereunder  (but  without  amendment  of the plan  under  which they
            were issued).  At his  discretion,  Executive may elect to surrender
            to the  Company  his rights in any such  options  and rights held by
            him and,  upon that  surrender,  the Company shall pay him an amount
            in cash equal to the aggregate  spread  between the exercise  prices
            of all those  options  and rights and the value of the Common  Stock
            purchasable  thereunder  (or of any other  security  into  which the
            Common  Stock has been  exchanged  or  converted)  as of the date of
            the  termination  of  employment,  the value to be determined by the
            reported  last  sale  price  of  the  Common  Stock  or  that  other
            security  (or the mean  between  the  reported  last  bid and  asked
            prices)  on  that  date  on  NASDAQ  (or,  if it is not  NASDAQ,  on
            whatever may then be the principal  exchange or quotation  system on
            which the  Company's  Common Stock or that other  security is traded
            at that time).
                  (5)   The  Company  shall  repay any policy  loans  previously
            taken  on the  Company's  life  insurance  policies  on  Executive's
            life  (provided  that  the  directors  of  the  Company  were  given
            written  notice  promptly  after the making of any such loans  which
            were made while  Executive was an officer of the Company),  and then
            shall  transfer to Executive  any and all of its right,  title,  and
            interest  in  and  to  all  Company  life   insurance   policies  on
            Executive's life (and upon that transfer,  Executive shall be deemed
            to have  released the Company from any and all  obligations  it then
            owes to him to  maintain  and pay  premiums on those  policies,  all
            other  provisions of any agreements  under which those policies were
            agreed to be maintained, however, to remain in effect).
<PAGE>
                  (6)   In  addition  to the  amounts  specified  in clauses (1)
            through  (5)  of  this  paragraph  (b),  the  Company  shall  pay to
            Executive,   at  the  same  time  as  those  amounts  are  paid,  an
            additional  amount  which,  after  taking into  account all federal,
            state,   and  local  income  and  excise  taxes  that  Executive  is
            required  to pay with  respect to receipt of the  additional  amount
            under this clause  (6),  will  render the net  after-tax  payment to
            Executive under this clause (6) equal to the sum of:
                        (A)   all  federal,  state,  and local excise taxes that
                  Executive  is  required  to pay with  respect to the  payments
                  made pursuant to clauses (1) through (5) above; and
                        (B)   all  federal,  state,  and local income and excise
                  taxes that  Executive  is required to pay with  respect to the
                  payment made pursuant to this clause (6).

            The  foregoing  amounts  of  federal,  state,  and local  income and
            excise  taxes  shall  be   determined   initially  by  a  nationally
            recognized  firm  of  independent  public  accountants  retained  by
            Executive at his expense or, at Executive's  option,  by independent
            public   accountants   at   the   Company's   expense,    and   such
            determination  and the basis  therefor shall be furnished in writing
            to  Executive  and  the  Company.  Payment  shall  be  made  by  the
            Company in  accordance  with that initial  determination  regardless
            whether  there is a dispute  over the  accuracy  thereof.  If either
            party   disputes  that  initial   determination   the  matter  shall
            promptly   be   referred  to  a   nationally   recognized   firm  of
            independent  public  accountants  selected by the  Executive  (which
            firm shall not have been  involved  in the  initial  determination),
            and Executive and the Company  shall  promptly  furnish to that firm
            such  information  as it  reasonably  requests.  The  Company  shall
            make  such  additional  payment  to  Executive  or  Executive  shall
            refund to the Company,  as the case may be, in  accordance  with the
            latter  firm's  determination.  The fees and  expenses  of that firm
            shall be borne by the Company.

            (c)   The Company may  withhold  from any  payments due to Executive
under  paragraph  (b) such amounts as its  independent  public  accountants  may
determine  are required to be withheld  under  applicable  federal,  state,  and
local tax laws.

            (d)   If  applicable,  the  provisions  of  this  Section  20  shall
control  over  the  provisions  of  Section  7. In the  event  that  Executive's
employment  is not  terminated  by the Company or the  Executive  within the six
month  period  specified  in Section  20(b),  the  provisions  of Section 7 once
again shall be applicable thereafter.

            (e) In  addition,  if any Change in Control  of the  Company  occurs
while this  Agreement is  effective,  the Company  shall  purchase and fully pay
for an annuity policy  sufficient to pay the retirement  benefits  called for by
Section 9 of this  Agreement and shall transfer  ownership  thereof to a "rabbi"
trust for the  benefit  of  Executive  (but  subject  to the  claims of  Company
creditors  to the  extent  required  under  applicable  tax  laws  so  that  the
transfer  to the  trust  will  not  itself  be an  event  upon  which  Executive
recognizes  income  for  federal  or  state  income  tax  purposes).  In lieu of
purchasing  the annuity  policy,  the Company may deposit cash into such a trust
sufficient to provide,  based on assumptions  believed reasonable in the written
opinion  of  a  nationally  recognized  employee  benefits   organization,   for
assuring payment of those retirement benefits to Executive and his spouse.
<PAGE>
            (f)   Payment of the  amounts  called  for by this  Section 20 shall
not affect the Company's  obligation  to pay  non-competition  compensation  and
benefits  under Section 3 above or retirement  benefits  under Section 9 and, if
elected by Executive, Section 10 above.

      21.   Successors and Assigns.  This  Agreement  shall inure to the benefit
of and be binding  upon the heirs,  legatees,  administrators,  successors,  and
assigns of the respective parties.

      IN WITNESS WHEREOF,  Executive for himself,  and the undersigned  director
of the  Company,  acting on behalf of the Company by  authority  of its Board of
Directors,  have  executed  this  Agreement  as of the day and year first  above
written.

       October 23, 1998                /s/David B. Lederer, Executive
 


                                       DETECTION SYSTEMS, INC.


       October 23, 1998                By:/s/Donald R. Adair, Chairman of the
                                       Compensation Committee of the Board of 
                                       Directors



                             DETECTION SYSTEMS, INC.

                     NON-EMPLOYEE DIRECTOR STOCK OPTION PLAN

                        Adopted by the Board of Directors
                                September 4, 1998

     This is a stock plan pursuant to which options to purchase the Common Stock
of Detection Systems,  Inc., a New York corporation (the "Corporation"),  may be
granted to non-employee directors of the Corporation as partial compensation for
their  service  as  directors.  This  plan  shall be  known as the  Non-Employee
Director  Stock Option Plan (the  "Plan").  The purpose of the Plan is to obtain
and retain the services of qualified persons who are not full-time  employees of
the Corporation to serve as directors.

     SECTION  1.   Administration.   The  Plan  shall  be  administered  by  the
Corporation's Board of Directors (the "Board").  The Board shall, subject to the
provisions of the Plan and Section 9 in particular, grant options under the Plan
and shall  have the power to  construe  the Plan,  to  determine  all  questions
thereunder,  and  to  adopt  and  amend  such  rules  and  regulations  for  the
administration of the Plan as it may deem desirable.

     SECTION 2. Shares  Available.  The Board shall  reserve for the purposes of
this Plan,  out of the  authorized  but  unissued  shares of Common Stock of the
Corporation,  or out of shares of Common Stock held in its  Treasury,  or partly
out of each, as shall be  determined  by the Board,  a total of 50,000 shares of
the Common Stock (or the number and kind of shares of stock or other  securities
which, in accordance with Section 7 of this Plan, shall be substituted for those
shares or to which those shares shall be adjusted).  In the event that an option
granted  under the Plan to any  non-employee  director  expires or is terminated
unexercised as to any shares covered thereby,  the shares not purchased under it
shall thereafter again be available for the purposes of this Plan.

     SECTION 3. Eligibility. Each member of the Corporation's Board of Directors
who is not a full-time  employee of the  Corporation  ("non-employee  director")
shall be eligible to receive stock options under this Plan.

     SECTION 4. Grants and Terms of  Options;  Option  Agreements.  The Board of
Directors may grant options from time to time under this Plan, provided that any
options  granted  prior  to  ratification  of  this  Plan  by the  Corporation's
shareholders  as provided in Section 8 below shall be subject to receipt of that
ratification.  The number of shares  purchasable under each option and all other
terms  and  conditions  of the  option  shall be as  determined  by the Board of
Directors,  provided  that,  unless this Plan is validly  amended as provided in
Section  9 below,  in the case of any  inconsistency  between  this Plan and the
terms and  conditions of any option,  the provisions of this Plan shall prevail.
As soon as  practicable  after  the  grant of an  option  under  the  Plan,  the
Corporation  and the  non-employee  director  shall  enter  into a Stock  Option
Agreement  evidencing the option so granted and its terms and  conditions.  That
agreement  shall be in such form,  consistent  with the Plan, as the Board shall
deem appropriate.
<PAGE>
   SECTION 5.  Exercise and Term of Options.

     (a) Options  granted under the Plan shall be exercisable as provided in the
terms of the option grant and the related Stock Option Agreement.

     (b) The  option  exercise  price of the shares of Common  Stock  subject to
options shall be 100% of the market value of the shares on the day the option is
granted.  The option price will be subject to adjustment in accordance  with the
provisions  of Section 7 of this Plan.  For  purposes  of this Plan,  the market
value of a share of Common Stock on any day shall be the closing price of such a
share on that day on the National  Association of Securities  Dealers  Automated
Quotation  System  ("NASDAQ")  or, if there is no such  price on that  day,  the
closing price of such a share on NASDAQ on the last preceding day on which there
was such a price,  except that, if the Board  determines  that NASDAQ is not the
principal  trading market system for the  Corporation's  Common Stock,  then the
market  value shall be the  reported  closing  price of the Common Stock on such
other market  system or exchange as the Board  determines  is then the principal
trading market for shares of the Corporation's Common Stock.

     (c)  Options  granted  under the Plan  shall have a term of up to ten years
from the date of the granting thereof, provided, however, that each option shall
automatically  terminate at the close of business on the 210th day after the day
on which the  non-employee  director  ceases to be a director of the Corporation
and if that day is not a regular  business  day at the  Corporation's  principal
office, then at the close of business of the next such regular business day.

     (d)  Options  granted  under  this Plan  shall not be  transferable  by the
non-employee director otherwise than by will, or if he or she dies intestate, by
the laws of descent  and  distribution  of the state of  domicile at the time of
death, and options shall be exercisable  during the director's  lifetime only by
the director.

     SECTION 6. Manner of Exercise of Option. Options granted hereunder shall be
exercised  by  the  directors  or  the  director's   executor  or  administrator
("optionee")  delivering to the  Corporation,  from time to time within the time
limits specified in Section 6 hereof, a written notice  specifying the number of
shares the optionee then desires to purchase  together with (i) check payable in
United States  currency to the order of the  Corporation  for an amount equal to
the  option  price  for  the  shares  being  purchased,  or (ii)  shares  of the
Corporation's  Common Stock owned by the optionee  duly endorsed to the order of
the  Corporation,  equal in value to the option price for such number of shares,
valued as of the close of business on the  immediately  preceding  business  day
(except  that  payment  in  shares  may,  in  whole  or in  part,  be by  way of
constructive transfer of shares in lieu of actual transfer and physical delivery
of certificates so that, to the extent of any payment by constructive  transfer,
the director will receive the number of shares being  purchased by that payment,
less the number of shares that the director is deemed to have transferred to the
Corporation in making that payment),  or (iii) any combination of the foregoing,
and such other  instruments or agreements  duly signed by the optionee as in the
opinion of counsel for the  Corporation  may be  necessary or advisable in order
that the  issuance of such number of shares  comply  with  applicable  rules and
regulations  under the Securities Act of 1933, any appropriate  state securities
laws or any  applicable  requirement of any national stock exchange or quotation
or market system on which the shares of Common Stock may then be traded. As soon
as practicable  after any such exercise of the option in whole or in part by the
optionee,  the Corporation will deliver to the optionee at the principal offices
of the Corporation, a certificate for the number of shares with respect to which
the option shall have been so  exercised,  issued in the  optionee's  name.  The
stock  certificate  shall  carry  such  appropriate  legend,  and  such  written
instructions  shall be  given to the  Corporation's  transfer  agent,  as may be
deemed  necessary or advisable by counsel to the  Corporation in order to comply
with the  requirements  of the  Securities  Act of 1933 or any state  securities
laws.
<PAGE>
     SECTION 7.  Adjustment  of Number of Shares.  If a dividend  or stock split
shall  hereinafter be declared upon the Common Stock of the Corporation  payable
in shares  of  Common  Stock of the  Corporation,  then the  number of shares of
Common Stock then subject to any  outstanding  option under the Plan, the number
of shares reserved for issuance under those outstanding  options, and the number
of shares  reserved for issuance  pursuant to the Plan but not yet covered by an
option shall be adjusted by adding to each such share the number of shares which
would be  distributable  thereon if the share had been  outstanding  on the date
fixed for determining the Shareholders entitled to receive the stock dividend or
stock split.  If the  outstanding  shares of the Common Stock of the Corporation
shall be changed into or exchanged  for a different  number or kind of shares of
stock or other  securities of the Corporation  whether  through  reorganization,
recapitalization or  reclassification,  then there shall be substituted for each
share of Common Stock subject to any  outstanding  option under the Plan and for
each share of Common Stock  reserved  for issuance  pursuant to the Plan but not
yet  covered  by an  option,  the  number  and kind of  shares of stock or other
securities into which each outstanding share of Common Stock shall be so changed
or for which each such share shall be exchanged.

     If, prior to the delivery by the  Corporation  of all the shares in respect
of which an option  has been  granted  hereunder,  a merger,  consolidation,  or
dissolution  in which the  Corporation  is not the surviving  corporation  shall
occur or a transfer of  substantially  all the assets of the  Corporation  shall
occur:

     (a)  If  provision  has  been  made  in  writing  in  connection  with  the
transaction for the assumption and  continuance of any such option  granted,  or
the  substitution  for such  option of a new option  covering  the shares of the
successor  corporation,  with  appropriate  adjustment  as to number and kind of
shares and prices, the option granted,  or the new option substituted  therefor,
as the case may be, shall continue in the manner and under the terms provided.

     (b) If provision has not been made in the  transaction  for the continuance
and  assumption of an option  granted  hereunder or for the  substitution  of an
option covering the shares of the successor  corporation,  then the holder of an
option granted  hereunder shall be entitled,  prior to the effective date of any
the transaction, to purchase the full number of shares under the option, failing
which  purchase,  any  unexercised  portion  shall be deemed  canceled as of the
effective transaction date.

     If there is any change, other than as specified above in this Section 7, in
the number or kind of outstanding  shares of Common Stock of the  Corporation or
of any stock or other securities into which the Common Stock has been changed or
for which it has been exchanged,  then  appropriate  adjustment shall be made in
the number and kind of shares  subject to and reserved for issuance  pursuant to
this Plan and as to which outstanding options or portions then unexercised shall
be exercisable,  to the end that the proportionate  interest of the holder of an
option and a prospective holder, with respect to options theretofore granted and
to be granted,  shall be  maintained  as before the  occurrence of the change or
exchange.  In the case of any such substitution or adjustment as provided for in
this  Section,  the option price for each share  covered  thereby  prior to such
substitution  or adjustment  will be the option price for all shares of stock or
other securities which shall have been substituted for the share or to which the
share has been adjusted pursuant to this Section.  No adjustment or substitution
provided  for in  this  Section  7  shall  require  the  Corporation  to  sell a
fractional share, and the total  substitution or adjustment with respect to each
option shall be limited accordingly.
<PAGE>
     SECTION 8. Effective Date and Duration of Stock Plan. The effective date of
the Plan shall be September 4, 1998, the date of its adoption by the Board.  The
duration of the Plan shall be ten years from the  effective  date.  The Plan and
all options granted hereunder prior to the Corporation's  1999 annual meeting of
shareholders  shall be subject to  ratification  by  shareholders at that or any
prior meeting.

     SECTION 9.  Amendment of the Plan. The Board shall have the right to amend,
suspend,  or terminate this Plan at any time,  except that shareholder  approval
shall be required for any amendment which:

     (a)   increases  the  maximum  number  of  shares  subject  to the Plan
(subject to Section 7 above);

     (b) changes the provisions of the Plan regarding the  determination  of the
option exercise price (subject to Section 7 above);

     (c) changes the maximum  period  during which any options may be granted or
remain outstanding; or

     (d) changes the requirements as to the class of persons eligible to receive
options.

     Termination  or  suspension  of the Plan or any  amendment of it shall not,
without the consent of a holder of an outstanding  option issued under the Plan,
affect the holder's rights under that option.



Date:    ___________________     Approved by: /s/Frank J. Ryan, Vice President


                                  Exhibit 11
                           DETECTION SYSTEMS, INC.
                      COMPUTATION OF EARNINGS PER SHARE
                    (In thousands, except per share data)
<TABLE>
<S>                                        <C>          <C>
Three Months Ended September 30,             1998        1997
                                             ----        ----
Net income                                 $1,230        $672
                                            =====       =====
Weighted average number of shares           6,324       4,837
                                            =====       =====
Basic earnings per share                    $0.19       $0.14
                                            =====       =====
Shares attributable to deferred
 compensation plans and stock
 options and warrants                         515         603
                                             ====        ====
Diluted earnings per share:                 $0.18       $0.12
                                             ====        ====



Six Months Ended September 30,               1998        1997
                                             ----        ----
Net income                                 $2,062      $1,805
Plus: amortization of redeemable stock                     13
                                            -----       -----
Income available to common stockholders     2,062       1,818
                                            =====       =====
Weighted average number of shares           6,307       4,724
                                            =====       =====
Basic earnings per share                    $0.33       $0.38
                                            =====       =====
Shares attributable to deferred
 compensation plans and stock
 options and warrants                         523         583
                                             ====        ====
Diluted earnings per share:                 $0.30       $0.34
                                             ====        ====
</TABLE>

<TABLE> <S> <C>


<ARTICLE>                     5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          MAR-31-1999
<PERIOD-END>                               SEP-30-1998
<CASH>                                           1,759
<SECURITIES>                                         0
<RECEIVABLES>                                   25,785
<ALLOWANCES>                                    (1,215)
<INVENTORY>                                     41,561
<CURRENT-ASSETS>                                72,447
<PP&E>                                          31,113
<DEPRECIATION>                                 (19,114)
<TOTAL-ASSETS>                                  99,403
<CURRENT-LIABILITIES>                           28,081
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           328
<OTHER-SE>                                      53,187
<TOTAL-LIABILITY-AND-EQUITY>                    99,403
<SALES>                                         35,455
<TOTAL-REVENUES>                                35,455
<CGS>                                           22,225
<TOTAL-COSTS>                                   33,061
<OTHER-EXPENSES>                                    44
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 427
<INCOME-PRETAX>                                  2,011
<INCOME-TAX>                                       781
<INCOME-CONTINUING>                              1,230
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                     1,230
<EPS-PRIMARY>                                     0.19
<EPS-DILUTED>                                     0.18
        


</TABLE>


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