Remote control system

A remote control system includes transmission means (11) which a driver can carry, the transmission means having a battery (D) and an operation section (b) which the driver can operate, the transmission means configured to transmit an operation signal in response to an operation of the operation section (b), and receiving means (12) disposed in a vehicle, and configured to receive the operation signal transmitted by the transmission means (11), and to activate an electrical equipment disposed in the vehicle in accordance with the operation signal. The transmission means (11) is configured to transmit information about a voltage of the battery (D) to the receiving means (12), and the receiving means (12) is configured to provide a notification when the voltage of the battery (D) has fallen to a predetermined level or below. The system is in particular used with a shutter (8) covered ignition key cylinder.