This device is mostly used in hotels and rented rooms. Its main purpose is to control the main power supply that is used to operate the room lighting. The device co-operates with the GR-43 . When the room resident exits the room and removes the magnetic key from the GR-43 socket, the power supply of the room remains active for 60 seconds and then closes. If the key is entered in the socket, the power supply to the room lighting is activated immediately.