Abstract: A personal device normally carried on or about a user is combined with an RF transmission circuit. The device includes a case and at least one function button carried by the case. The RF transmission circuit is disposed within the case and includes a processor, a memory and an RF transmitter. The memory has at least one digital code stored therein. The processor is responsive to actuation of the function button to apply the code to the transmitter. The transmitter is further responsive to actuation of the function button to transmit a carrier signal modulated by the code applied thereto. The code when received by a corresponding receiver may then develop a control signal. The control signal may then be used to activate circuitry in a device to be controlled. Alternatively, the transmitter may periodically transmit an address. The device to be controlled may then include a receiver responsive to this address.