A remote control is a device which can make an activation at distance by using the Electromagnetic waves. It is mainly composed by two units:
one remote, transmitter, portable, carried by the user in the car or hand.
one receiver, in fixed position, connected to the device to drive.
The transmitter sends a message by means a radio wave to the receiver. The information present in the message is composed by a security code ( user code) and an accomplishment command. The receiver, once detected the radio message, make a comparison between the received code and the memorised code and if the operation is successfull , activates the relay, carrying out the command.