EXHIBIT 10.6

                               FIFTH AMENDMENT TO
                                CREDIT AGREEMENT

     This Fifth  Amendment is made as of November , 2002 among SYNERGX  SYSTEMS,
INC. (f/k/a  Firetector Inc.), a Delaware  corporation (the "Company");  GENERAL
SOUND (TEXAS) COMP ANY , a Delaware corporation ("General"); CASEY SYSTEMS INC.,
a New  York  corporation  ("Casey");  and  PYROTECH  SERVICE  INC.,  a New  York
corporation  ("Pyrotech" and collectively  with the Company,  General and Casey,
the  "Borrowers")  as  co-borrowers  and CITIZENS  BUSINESS  CREDIT  COMPANY , a
division  of  Citizens   Leasing   Corporation,   a  Rhode  Island   corporation
(hereinafter referred to as "Citizens") as lender.

     WHEREAS, the Borrowers and Citizens are parties to a Credit Agreement dated
as June 28, 1998 (as amended, the "Credit Agreement");

     WHEREAS,  Mirtronics  Inc.,  the  principal  stockholder  of  the  Company,
proposes to reduce its ownership of the Company below 40% as currently  required
by the Credit Agreement;

     NOW THEREFORE, the parties agree as follows:

     1. Section 4.26 Controlling  Interest is amended in its entirety to read as
follows:

     "The  stockholders  of the Company  designated in Schedule 4.26 will at all
     times own a  Controlling  Interest  in the  Company  and its  subsidiaries.
     "Controlling  Interest shall mean sufficient  voting control to designate a
     majority  of  the  board  of  directors.  Notwithstanding  anything  to the
     contrary  contained herein,  the stockholders of the Company  designated on
     Schedule  4.26 shall be  permitted  to reduce  their  aggregate  beneficial
     ownership to  twenty-five  percent (25%) of the Company's  equity  provided
     that at any time  during  this  Agreement  no other  person or  entity  has
     greater voting power."

     2. Except as set forth in this Fifth Amendment,  the Fourth Amendment dated
as of June 24, 2002,  the Third  Amendment  dated as of May 14, 2002, the Second
Amendment  dated as of  October  1,  2001 and the  First  Amendment  dated as of
October 10, 2000, the Credit Agreement remains in full force and effect.

IN WITNESS WHEREOF, the parties hereto have executed this Fourth Amendment under
seal as of the date first above written.

                                 BORROWERS:

                                 SYNERGX SYSTEMS, INC.

                                 (f/k/a Firetectr
                                 By:

                                 John A. Poserina . Chief Financial Officer


                                 GENERAL SOUND (TEXAS) COMPANY
                                 By:

                                 John A. Poserina . Chief Financial Officer


                                 CASEY SYSTEMS INC.
                                 By:

                                 John A. Poserina . Chief Financial Officer



                                 PYROTECH SERVICE INC.
                                 By:

                                 John A. Poserina . Chief Financial Officer


                                 LENDER:
                                 CITIZENS BUSINESS CREDIT COMPANY
                                 By:

                                 Vincent P. O'Leary
                                 Senior Vice President


Systems Service  Technology  Inc., a subsidiary of the Company,  consents to the
foregoing  amendment and  acknowledges  the continuing  validity of its Guaranty
dated June 23, 1998.

                                  Systems Service Technology Inc.
                                  By:

                                  John A. Poserina . Chief Financial Officer