Document:

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                                                                    Exhibit 10.J

September 15, 1998

Mr. Jorge Hevia

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

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

Dear Jorge:

As per our meeting today, we agree to the following points for your employment
as Vice President of sales and marketing. We would like your employment to
commence October 5, 1998.

1)   Annual Salary of $165,000, with annual reviews hereafter on your
     anniversary date. Upon being promoted to Senior Vice President of Sales and
     Marketing (estimated to occur approximately May 1999) salary will be
     increased to $175,000.

2)   Signing Bonus- A signing bonus will be paid as follows:

     $10,000 upon employment

     $10,000 end of December 1998

     $10,000 end of May 1998

3)   Bonus Plan- An additional 61% of annual salary (or $95,000) can be earned
     as follows:

     A)   *Sales Volume- Sales volume bonus plan is as follows:

          a)   Net sales increase 5%- Bonus = $10,000

          b)   Net sales increase 10%- Bonus = $28,875

          c)   Net sales increase 15% or greater- Bonus = $50,000

     *Sales volume will be measured for the year ended 6/30/99 as compared to
     6/30/98. In the event of an acquisition, this plan will be adjusted.

     B)   Profitability- Profitability bonus plan is based on the average
          selling price of the top 250 stock keeping units (SKU's), which
          represent approximately 99% of overall corporate sales. The plan is as
          follows:

          a)   Average selling price is 6.5% below target (level 1 pricing)-
               Bonus = $7,000

          b)   Average selling price is 6% below target- Bonus = $17,325

          c)   Average selling price is 5% below target- Bonus = $25,000

     C)   *Sales and Marketing Budget-

          a)   If the Sales and Marketing Budget is met (not exceeded)- Bonus =
               $11,550

          b)   If the Sales and Marketing expenses are 5% or more below budget-
               Bonus = $20,000

     *The budget may be adjusted throughout the year, and would require approval
     of joint executive management.

          As discussed, since you will be joining the Company approximately in
          October 1998, the bonus plan would have to be prorated.

4)   Stock Options- 16,600 stock options would be awarded upon employment, at

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     the fair market value price of the Napco stock at that time. Future stock
     options will be granted based on performance.

5)   A contract will be drawn up for two (2) years and will include a clause for
     severance of nine (9) months salary and health insurance for six (6)
     months. The contract will be reviewed for renewal one (1) year before its
     expiration date.

6)   401K- The Company 401K policy allows for a company match of 1% of
     compensation (salary and bonus). The policy also includes a one (1) year
     waiting period before new employees can be added to the plan.

7)   Auto Allowance- You will be entitled to an auto allowance of $540 per
     month.

8)   Vacation- You will be entitled to three (3) weeks vacation.

I look forward to a long and prosperous relationship with you. This should be a
lot of fun.

Sincerely,

/s/ Richard Soloway
-------------------------------------
Richard Soloway
Chairman

Soloway/ Hevia- 9-15-98

                                       E-7<PAGE>

                                                                         Ex-10.K

               AMENDMENT NO. 2 TO THE LOAN AND SECURITY AGREEMENT

     AMENDMENT NO. 2 to the Loan and Security Agreement dated as of June 30,
1999 ("Amendment No. 2") by and between NAPCO SECURITY SYSTEMS, INC., a New York
corporation having a place of business at 333 Bayview Avenue, Amityville, New
York 11701 (the "Debtor") and HSBC BANK USA F/K/A MARINE MIDLAND BANK, having a
place of business at 534 Broad Hollow Road, Melville, New York 11747 (the
"Secured Party").

                                   WITNESSETH

     WHEREAS, as of May 12, 1997, Debtor and Secured Party had entered into a
certain loan and security agreement, as amended by amendment no. 1 to the loan
and security agreement dated as of May 28, 1998, as may be amended from time to
time (the "Agreement");

     WHEREAS, the Debtor has requested that the Secured Party extend the
Termination Date, as set forth in the Agreement and the Secured Party has agreed
to do so, in the manner set forth below, provided however, that, among other
things, Debtor execute this Amendment No. 2.

     NOW, THEREFORE, in consideration of the mutual promises and for other good
and valuable consideration, the receipt of which is hereby acknowledged, the
parties hereto agree as follows:

     1. The definition of "Termination Date" contained in Section 1.1. of the
Agreement is hereby amended to read in its entirety as follows:

                    "Termination Date" shall mean the earlier to occur of (a)
               November 30, 2000 or, if such day shall not be a Business Day,
               the next succeeding Business Day, or (b) upon the occurrence of
               an Event of Default.

     2. As an inducement to the Bank extending the Termination Date, Debtor
represents and warrants to Secured Party that, as of the date of execution of
this Amendment No. 2, (i) the representations and warranties set forth in
Article 4 of the Agreement and the representations and warranties of Debtor and
any Third Party set forth in the other Transaction Documents to which any is a
party are true and correct in all respects, (ii) no event has occurred and is
continuing which constitutes an "Event of Default" under any of the Transaction
Documents (as "Event of Default" is defined in each of those Transaction
Documents"), and (iii) Debtor is in compliance with the covenants set forth in
Articles 9 and 10 of the Agreement.

     3. Debtor represents and warrants to Secured Party that there are no
offsets, defenses or counterclaims to the payment of the indebtedness owing
Secured Party, including the Advances, and to the continuing general security
interest in the Collateral granted to Secured Party by Debtor as security for
payment of the indebtedness, as fully described in the Agreement.

     4. Except as modified herein, all other provisions of the Agreement and the
other Transaction Documents remain unmodified and are in full force and effect.

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     5. This Amendment No. 2 shall be governed by the laws of the State of New
York.

     IN WITNESS WHEREOF, the parties have executed this Amendment No. 2 as of
the day and year first above written.

                                        HSBC BANK USA F/K/A MARINE
                                        MIDLAND BANK

                                        By: /s/ Thomas J. Dionian
                                            ------------------------------------
                                            Vice President

                                        NAPCO SECURITY SYSTEMS, INC.

                                        By: /s/ Kevin Buchel
                                            ------------------------------------
                                            Senior Vice President

STATE OF NEW YORK
                    SS:
COUNTY OF SUFFOLK

On this 9th day of August, 1999, before me, the undersigned, a Notary Public in
and for said State, personally came THOMAS J. DIONIAN, personally known to me or
proved to me on the basis of satisfactory evidence to be the person, whose name
is subscribed to the within instrument and acknowledged to me that he executed
the same in his capacity and that by his signature on the instrument, the person
or entity upon behalf of which the person acted executed the instrument.

                                        /s/ Antonella Stallone
                                        ----------------------------------------
                                        Notary Public

STATE OF NEW YORK
                    SS:
COUNTY OF SUFFOLK

On this 9th day of August, 1999, before me, the undersigned, a Notary Public in
and for said State, personally came KEVIN BUCHEL, personally known to me or
proved to me on the basis of satisfactory evidence to be the person, whose name
is subscribed to the within instrument and acknowledged to me that he executed
the same in his capacity and that by his signature on the instrument, the person
or entity upon behalf of which the person acted executed the instrument.

                                        /s/ Antonella Stallone
                                        ----------------------------------------
                                        Notary Public

                                       E-9<PAGE>

                                                                         EX-10.L

                              EMPLOYMENT AGREEMENT

     This AGREEMENT is made this 27th day of July 1999, by and between Napco
Security Systems, Inc. and/or its related subsidiaries and/or affiliates (herein
referred to collectively as "NAPCO"), a Delaware corporation having its
principle place of business at 333 Bayview Avenue, Amityville, New York 11701
and Michael Carrieri (hereinafter "EXECUTIVE") residing at .

     WHEREAS, NAPCO desires to employ EXECUTIVE as Vice President of Engineering
Development and EXECUTIVE desires to be employed by NAPCO.

     NOW THEREFORE:

I.   EMPLOYMENT:

     Subject to the terms and conditions hereinafter set forth, NAPCO hereby
employs EXECUTIVE and EXECUTIVE agrees to be employed by NAPCO as its Vice
President of Engineering Development. EXECUTIVE agrees to devote his full time
and best efforts to the business of NAPCO.

II.  DUTIES:

     EXECUTIVE shall, during the continuance of his employment hereunder:

          (a) Devote the whole of his time and attention and abilities to the
     business of NAPCO during regular working hours and at such other times as
     may be necessary;

          (b) Perform such duties as are usually performed by an EXECUTIVE
     serving in his capacity and such other duties as may be assigned to him
     from time to time by the Chairman of NAPCO;

          (c) Use his best efforts to promote the business of NAPCO; and

          (d) Perform his duties subject to the direction of the Chairman of
     NAPCO.

III. COMPENSATION:

     For the services to be rendered under this AGREEMENT, NAPCO agrees to pay
the EXECUTIVE the following compensation:

          (a) SALARY - An annual salary of $150,000.00 subject to annual reviews
     and compensation adjustments hereinafter on the anniversary date of the
     commencement of employment. Upon being promoted to Senior Vice President of
     Engineering Development (anticipated to occur approximately May 2000
     depending on performance), EXECUTIVE's annual salary will be increased to
     $160,000.00. The annual salary will be paid periodically in accordance with
     NAPCO's standard payroll practices, which is presently on a weekly basis.

          (b) BONUS PLAN - A bonus of $30,000.00 may be earned by

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     EXECUTIVE based on getting each of the new products on the Phoenix #1
     program into the shipping department on or before March 2000, and by
     getting the Phoenix #2 Program products into the shipping department by
     August 2000. The $30,000.00 could be prorated to reflect the portions of
     the Phoenix #1 and Phoenix #2 programs that are already shipped by March
     2000 and the August 2000 dates. But it is understood that shipping 100% of
     the products of the Phoenix #1 and #2 programs by March 2000 and August
     2000 respectively are the goals.

          In addition, the EXECUTIVE will receive $5,000.00 for meeting the
Engineering budget for the fiscal year ending June 30, 2000.

          (c) STOCK OPTIONS - 15,000 stock options, in accordance with NAPCO's
     Incentive Stock Option Plan, will be awarded to EXECUTIVE upon employment,
     at the fair market value price of NAPCO stock (Nasdaq: "NSSC") at that
     time. These stock options will be recorded according to regulations set
     forth by the Securities and Exchange Commission ("SEC") and/or other
     government entities. EXECUTIVE will also receive an additional 10,000 stock
     options upon being promoted to Senior Vice President of Engineering
     Development. Thereafter, future stock options may be granted based on
     performance.

          (d) SEVERANCE AND HEALTH INSURANCE - In consideration for EXECUTIVE
     entering a new industry, upon any termination of employment not based on
     cause, EXECUTIVE will be entitled to severance pay equaling six (6) months'
     salary and continued health insurance for a period of six (6) months. The
     payment of any such severance or continued health insurance will be paid
     according to the same payment schedule as if EXECUTIVE was still employed
     during that time frame.

          (e) VACATION - EXECUTIVE will be granted three (3) weeks' vacation
     time.

          (f) 401(K) PLAN - NAPCO will provide EXECUTIVE with 401(k) benefits in
     accordance with the terms and conditions of its corporate plan in effect.

IV.  RESTRICTIVE COVENANTS:

          (a) EXECUTIVE acknowledges that technical, financial and other
     confidential information of NAPCO or any third party with which NAPCO is in
     technical or commercial cooperation, or which EXECUTIVE may obtain
     knowledge in the course of and by virtue of his employment, constitutes
     valuable and confidential assets and that unauthorized disclosure or
     utilization thereof would be detrimental to NAPCO. EXECUTIVE therefore
     agrees that he will not disclose or utilize, either during his employment
     or thereafter, any such technical or other confidential information,
     without first obtaining NAPCO's written consent thereto, except as such
     disclosure or utilization may be required by EXECUTIVE's service to NAPCO
     or by law.

          (b) All trade secrets and proprietary information including, but not
     limited to, all formulas, patterns, designs, sales and business plans,
     plant secrets, processes, methods for determination of costs, customer
     lists, and other confidential secrets, or internal information which
     heretofore have been or hereafter may be conceived by or

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     disclosed to EXECUTIVE in the course of EXECUTIVE's employment, shall at
     all times be and remain the sole and exclusive property of NAPCO, except as
     required by law or by EXECUTIVE's employment at NAPCO, and shall be kept
     confidential by EXECUTIVE and not be utilized personally be EXECUTIVE or
     divulged by EXECUTIVE to any third party or company.

          (c) All inventions, improvements, patent pendings, ideas concerning
     patents or improvements relating thereto (collectively hereinafter referred
     to as "Inventions") which EXECUTIVE solely, or with others, receives or
     reduces to practice or may conceive in the course of such employment or
     with the use of NAPCO time, material or facilities, or relating to any
     subject matter with which my work for NAPCO is or may be concerned or
     reduced to practice during the term of my employment by NAPCO, shall be the
     sole property of NAPCO.

          (d) EXECUTIVE shall promptly disclose in writing to NAPCO and maintain
     adequate and current written records of such Inventions, in the form of
     notes, sketches, drawings or reports, which shall be the property of NAPCO,
     shall specifically assign to NAPCO all such Inventions and shall executed
     all papers and perform all other lawful acts which NAPCO deems necessary or
     advisable for the preparation and prosecution of patent applications and
     the procurement and maintenance of United States and foreign patents and
     for the transfer of interests therein to NAPCO. It is understood and agreed
     that all expenses incurred with respect to the obligations of this
     paragraph shall be by NAPCO or its nominee. EXECUTIVE shall make no other
     application for intellectual property relating to such Inventions without
     the express written approval of NAPCO.

          (e) EXECUTIVE shall not make or permit to be made, except pursuant to
     his duties hereunder and for the sole use and account of NAPCO, any papers
     or documents, including drawings and records of research, made by EXECUTIVE
     or at EXECUTIVE's directions or which may come into EXECUTIVE's possession
     in any way, and EXECUTIVE shall deliver to NAPCO on the termination of
     employment, all such materials in EXECUTIVE'S possession.

          (f) EXECUTIVE agrees that during the term of employment hereunder, he
     will not, except with the prior written consent of NAPCO, directly or
     indirectly engage in, or accept any position as an agent, employee, officer
     or director of, or consult, advise with, invest in, or otherwise in any way
     give assistance to aid any person, firm or corporation (or any of their
     related entities) in the security alarm, fire alarm, security lock,
     security hardware or entry access products industry either as a
     manufacturer, installer and/or distributor. For a period of three (3) years
     after the termination of EXECUTIVE's employment hereunder, he will not,
     without the prior written consent of NAPCO, directly or indirectly engage
     in, or accept any position as agent, employee, officer or director of, or
     consult, advise with, invest in (except in insignificant amounts) or
     otherwise in anyway give assistance or aid to any person, firm, or
     corporation (or any of their related entities) engaging in business which
     relates directly or indirectly with the business of NAPCO or which would be
     competitive or a competitive substitute with any product(s) or product
     lines in the security alarm, fire alarm, security lock, security hardware
     or entry

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     access products industry either as a manufacturer, installer, and/or
     distributor of which NAPCO was involved with at the time of termination of
     EXECUTIVE's employment hereunder. This provision applies to any
     aforementioned affiliation of EXECUTIVE to any person, firm, or corporation
     (or any of their related entities) engaging in business which relates
     directly or indirectly with the business of NAPCO or which would be
     competitive or a competitive substitute with any product(s) or product
     lines in the security alarm, fire alarm, security lock, security hardware
     or entry access products industry either as a manufacturer, installer,
     and/or distributor which is conducting any business in the United States of
     America. EXECUTIVE explicitly acknowledges the reasonableness of the scope
     of this paragraph in view of the fact that EXECUTIVE was never previously
     engaged in any businesses relating to NAPCO, and in view of the fact that
     EXECUTIVE's position at NAPCO will enable him to become privy to
     significant and sensitive information.

          (g) EXECUTIVE covenants and agrees that so long as he is in the employ
     of NAPCO and after leaving the employ of NAPCO, he will not directly or
     indirectly disclose, communicate, divulge or furnish to or use for the
     benefit of himself (except while he is in the employ solely and in the
     pursuit of the activities of NAPCO) or any other person, firm or
     corporation, any other of the trade secrets, designs, improvements,
     marketing plans, inventions of NAPCO belonging to NAPCO, or the designs, or
     processes of distribution, or processes of manufacture of any product or
     article sold or distributed by NAPCO, which EXECUTIVE may learn by virtue
     by his activities or which he may develop for NAPCO.

V.   EXCEPTION TO SECTION IV:

          Based on EXECUTIVE's representation that he has conceived an invention
     in the field of telephone answering machines ("the Invention") that is
     unrelated to NAPCO's business, the parties agree to exclude the Invention
     from the obligations of Section IV herewith. In order to avoid any future
     disputes as to the nature and scope of the Invention and to avoid
     disclosure of the Invention at this time, EXECUTIVE has agreed to provide
     Attachment A hereto which is a sealed envelope that EXECUTIVE represents
     contains a written description of the Invention. NAPCO agrees not to unseal
     Attachment A unless either authorized by EXECUTIVE to do so or if a dispute
     arises under this Section.

          In order to avoid any potential conflict of interest, EXECUTIVE agrees
     not to directly market his Invention or any patent received thereon to any
     known customer or vendor of NAPCO without prior authorization from NAPCO's
     Chairman of the Board.

VI.  REMEDIES:

     The parties hereto recognize that, in the event of any breach or threatened
breach by the EXECUTIVE of the provisions of Section IV hereunder of, NAPCO will
suffer irreparable injury in connection with which damages would be difficult,
if not impossible, to ascertain and it is therefore agreed that NAPCO, in
addition to and without limiting any other remedy or right it may have under
this AGREEMENT, or at law or in equity, shall be entitled to an injunction
against the EXECUTIVE issued by any court of competent jurisdiction enjoining

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any such breach or threatened breach.

VII. EFFECT OF WAIVER:

     The waiver by either party of a breach of any provision of this AGREEMENT
shall not operate or be construed as a waiver of any subsequent breach thereof.

VIII. NOTICE:

     Any and all notices referred to hereunder shall be sufficient if furnished
in writing and sent by registered or certified mail to the parties at the
addresses given herein, or to such other addresses as may hereafter be
designated by notice in writing given in accordance with the provisions of this
paragraph.

IX.  GOVERNING LAW:

     The parties agree that this AGREEMENT shall be governed, interpreted and
construed in accordance with the substantive laws of the State of New York.

X.   SEVERABILITY:

     If any provision of this AGREEMENT shall, to any extent, be deemed invalid
or unenforceable, the remainder of this AGREEMENT shall not be affected, and
each term shall be valid and shall be enforced to the extent permitted by law.

XI.  AMENDMENTS TO AGREEMENT:

     No amendment of this AGREEMENT shall be effective unless reduced to writing
and executed by a duly authorized officer of NAPCO and by EXECUTIVE.

XII. TERM:

     This AGREEMENT shall be for a term of two years from the first date of
employment and may be renewed upon mutual written agreement by the parties. The
AGREEMENT will be reviewed with respect to a possible renewal one (1) year prior
to its expiration date. However, nothing in this provision requires NAPCO to pay
severance greater than that established in Section III.

XIII. TERMINATION OF EMPLOYMENT:

     In the event that EXECUTIVE voluntarily leaves the employ of employer
without cause or he is terminated with cause, all benefits of this AGREEMENT
shall cease.

XIV. MISCELLANEOUS:

     This AGREEMENT is to be read in conjunction with the rights and obligations
presented in NAPCO's Salaried Employee Handbook. Furthermore, nothing in this
AGREEMENT is intended or should be interpreted to circumvent any obligations
applicable to NAPCO pursuant to federal, state or local laws.

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Napco Security Systems, Inc.            EXECUTIVE

By: /s/ Richard L. Soloway              /s/ Michael Carrieri
    ---------------------------------   ----------------------------------------
    Richard L. Soloway                  Michael Carrieri
    Chairman of the Board

Dated: 7/15/99                          Dated: 7/26/99

                                      E-15

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