Abstract: The radio frequency (RF) security system includes a central control unit and a plurality of portable transmitters (up to 128 transmitters) which are in radio frequency communication with the central control unit. This communication is one-way from the portable transmitters to the central control unit. The central control unit and the portable transmitters both include microprocessors and associated memory. Each portable transmitter is assigned a unique unit binary code. In order to detect destruction of the transmitter unit, a powerline is imbedded in an elongated band which is placed on the wrist of a child or attached to an inanimate object. When the band is severed, the powerline is severed and the microprocessor in the portable transmitter is shut down. During normal operation (without the band being severed), the portable transmitter has an RF transmitting circuit which is fed the unique unit code and which frequency modulates (FM) the RF carrier signal with the unit code.