System and transmitter

摘要: An improved system for an anti-theft transponder is disclosed. The new includes, besides a general paged autonomous low power transmitter device capable of transmitting specified address code accessing at least one which comprises receiver module operating on designated frequency used by coverage paging system. A the additionally number further modules tracking when activated. according to present invention provided with first individual access identity intended authorization activation and second will be control direct within limited transmitter. can also regularly that item under surveillance does not illegally leave site where it kept.