AMENDMENT

   1

                                                                   Exhibit 10(o)


                                    AMENDMENT

         AMENDMENT NO. 1, dated as of August 5, 1999, to the Agreement, dated as
of September 1, 1998, between SENSORMATIC ELECTRONICS CORPORATION, a Delaware
corporation ("Sensormatic"), and Xxxxxx X. Xxxxx ("Director").

                              W I T N E S S E T H:

         WHEREAS, the parties hereto wish to amend and clarify the Agreement in
relation to medical insurance benefits as hereinafter set forth;

         NOW, THEREFORE, in consideration of the premises and for other good and
valuable consideration, the parties hereto agree as follows:

         A new Section 2A is hereby added to the Agreement as follows:

                  2A. MEDICAL INSURANCE BENEFITS. Sensormatic currently provides
         to Director group medical and group dental plans in which Director and
         his eligible dependents are participants. Sensormatic hereby agrees
         that there shall be no material reduction in any such currently
         provided benefits (and there shall be no material reduction in any
         additional benefits subsequently approved by Sensormatic's Board of
         Directors or any Committee thereof) during the pendency of an Attempted
         Change in Control or in the event of a Change in Control or at any time
         within 36 months after a Change in Control has occurred. Nothing in
         this Agreement shall be deemed to require Sensormatic to continue any
         such benefits or to prohibit Sensormatic from modifying any such
         benefits in any respect, although it is anticipated that such benefits
         (together with any such additional benefits) shall continue to be
         provided to Director on the same or a substantially similar basis in
         the future in accordance with the terms of the applicable benefit plans
         and policies.

         Except as expressly set forth in this Amendment, nothing contained
herein shall be deemed to alter, change, waive, amend or otherwise modify any
provision of the Agreement.

         IN WITNESS WHEREOF, the parties hereto have executed this Agreement on
the date first set forth above.

                                   SENSORMATIC ELECTRONICS
                                        CORPORATION


Director:                          By: /s/ Xxxxxx X. Xxxxxxx
                                      -----------------------------------------
                                      Name: Xxxxxx X. Xxxxxxx
                                      Title: Vice President - Corporate Counsel


/s/ Xxxxxx X. Xxxxx
-------------------
Xxxxxx X. Xxxxx