Eastern Bank
Logo Appears Here




                                 May 20, 1999

International Electronics, Inc.
427 Turnpike Street
Canton, Massachusetts 02021
Attn:  John Waldstein, President and Treasurer

Gentlemen:

     Reference is made to our Demand Loan and Security Agreement Accounts
Receivable and Inventory dated February 28, 1997, together with all amendments
and additions thereto (hereinafter called the "AGREEMENT").  Notwithstanding the
provisions of the Agreement, it is agreed, effective immediately, that the
Agreement shall be amended as follows:

     1.  Section 5.A. of the Agreement is hereby stricken in its entirety and
the following new Section 5.A. substituted therefor:

          "A.  Subject to the terms and provisions of this Agreement, the Bank
     hereby establishes a discretionary revolving line of credit in Borrower's
     favor in the amount set forth below, as determined by Bank from time to
     time hereafter.  Bank may make such loans to Borrower, based upon such
     facts and circumstances existing at the time of the request, as from time
     to time Bank elects to make which are secured by Borrower's Inventory,
     Accounts and all other Collateral and the proceeds thereof.  Without
     limiting the discretionary nature of Bank's obligation to make loans
     hereunder, or the demand feature of any loans that Bank does make
     hereunder, Borrower agrees that the aggregate unpaid principal of all
     direct loans plus the sum of the aggregate amount undrawn on all letters of
     credit and acceptances shall not exceed the sum of One Million
     ($1,000,000.00) Dollars.  All such loans shall bear interest and at the
     option of Bank shall be evidenced by demand notes in form satisfactory to
     Bank, but in the absence of notes shall be conclusively evidenced by the
     Bank's record of disbursements and repayments and shall be payable ON
     DEMAND.  Interest will be charged to Borrower at a fluctuating rate which
     is the daily equivalent to the Base Rate in effect from time to time, or at
     such other rate agreed on from time to time by the parties, upon any
     balance owing to Bank at the close of each day and shall be payable
     monthly in arrears, on the first day of each month, until the Bank makes
     demand.  The rate of interest payable by Borrower shall be changed
     effective as of that date in which a change in the Base Rate becomes
     effective.  Interest shall be computed on the basis of the actual number of
     days


     elapsed over a year of three hundred sixty (360) days.  The term "BASE
     RATE" as used herein and in any supplement and amendment hereto shall mean
     the rate of interest announced from time to time by Bank, at its head
     office, as its Base Rate, it being understood that such rate is a reference
     rate and not necessarily the lowest rate of interest charged by the Bank.
     The Base Rate on the date hereof is agreed to be eight and one-quarter (8
     1/4%) percent."

     2.  Section 6 of the Agreement is hereby stricken in its entirety and the
following new Section 6 substituted therefor:

          "6.  DEFINITIONS OF QUALIFIED ACCOUNT.  This section has been
     intentionally reserved."

     3.  Section 7 of the Agreement is hereby stricken in its entirety and the
following new Section 7 substituted therefor:

          "7.  DEFINITION OF ELIGIBLE INVENTORY.  This section has been
     intentionally reserved."

     4.  Section 13(d) of the Agreement is hereby stricken in its entirety and
the following new Section 13(d) substituted therefor:

          "(d)  Borrower will at all times keep accurate and complete records of
     Borrower's Inventory, Accounts and other Collateral, and Bank, or any of
     its agents, shall have the right to call at Borrower's place or places of
     business at intervals to be determined by Bank, and without hindrance or
     delay, to inspect, audit, check, and make extracts from any copies of the
     books, records, journals, orders, receipts, correspondence which relate to
     Borrower's Accounts, and other Collateral or other transactions, between
     the parties thereto and the general financial condition of the Borrower and
     Bank may remove any of such records temporarily for the purpose of having
     copies made thereof.  Absent the occurrence of an Event of Default which is
     continuing, Borrower shall not be obligated to pay Bank an audit fee in
     connection with any such audit or inspection."

     5.  Section 14(a) of the Agreement is hereby stricken in its entirety and
the following new Section 14(a) substituted therefor:

          "(a)  (Debt to Worth) permit the aggregate amount of its indebtedness
     to be more than one and one-half (1  1/2) times the amount of its tangible
     net worth on the last day of any fiscal year beginning with the fiscal year
     ending August 31, 1998, or the last day of the month of February, 1999,
     commencing February 28, 1999;"


     6.  The Agreement is hereby amended by adding the following new Section
14(m) thereto:

          "(m)  (Minimum Net Earnings) permit the net after tax earnings of
     Borrower for the six (6) month period ending on the last day of February of
     each year or the twelve (12) month period ending on the last day of August
     of each year to be less than One ($1.00) Dollar."

     Kindly note that the alterations contained herein do not in any way alter,
release or change any other sections contained in the Agreement.

     Please acknowledge your agreement to the foregoing by signing the enclosed
copy of this letter and returning the same to the undersigned.

                                    Very truly yours,

                                    EASTERN BANK

                                    By: /s/ Alan Roberts
                                        ----------------------------
                                        Alan Roberts, Vice President


UNDERSTOOD AND AGREED TO:

INTERNATIONAL ELECTRONICS, INC.

By: /s/ John Waldstein
    ---------------------------------------
    John Waldstein, President and Treasurer