Patent ID: 7656270

Claim:
A keyless entry device comprising a car-mounted transmitter-receiver mounted in a vehicle and a portable transmitter-receiver, the keyless entry device comprising: the car-mounted transmitter-receiver including a signal transmitter-receiver, a controller, a first memory that stores an ID assigned to the portable transmitter-receiver, and a second memory that stores an ID assigned to the car-mounted transmitter-receiver; and the portable transmitter-receiver including a signal transmitter-receiver, a controller, a key switch, a first memory that stores the ID assigned to the car-mounted transmitter-receiver, and a second memory that stores the ID assigned to the portable transmitter-receiver; wherein the transmission and reception of radio signals between the car-mounted transmitter-receiver and the portable transmitter-receiver are made in one of an active entry mode and a passive entry mode, in both entry modes the transmitted signals contain the ID of the car-mounted transmitter-receiver and the ID of the portable transmitter-receiver, and in the active entry mode, the signal transmitted by the portable transmitter-receiver further contains an instruction signal corresponding to the operation of the key switch, the instruction signal controlling a selected mechanism disposed in the vehicle; and wherein the ID of the portable transmitter-receiver is registered by radio in the vehicle.