Patent ID: 8010171

Claim:
A communications system for a vehicle user, comprising: a portable receiver capable of being carried on a vehicle user's person and powered by a first battery; a portable transceiver, capable of being carried on a vehicle user's person and powered by the first battery; and a vehicle-mounted transmitter, supported by a vehicle and in electrical communication with the vehicle's power source, wherein the vehicle-mounted transmitter is capable of communicating with the portable receiver, wherein coded information contained in a transmission from the vehicle-mounted transmitter may be received by the portable receiver and thus activates a push to talk function of the portable transceiver, wherein the portable receiver activates a function if the number of transmissions from the vehicle-mounted transmitter is equal to or above a predetermined number and the transmissions are identical, and does not activate the function if the number of transmissions from the vehicle-mounted transmitter is below the predetermined number or the transmissions are not identical.