4 Ports ON-OFF Digital Wireless Remote Control Switch. - Only can use in countries using 200V~240V AC Socket. - Only 7 wires to hook up. - The remote control switch is powered by 2 x 23A battery (not included) - Fast and easy installation not obstructed by walls capable of connecting any loads. Remote controller and switch can be used simultaneously for ease and flexibility. - Press any one of the buttons A B C and D on remote controller of switch the corresponding light or socket is powered another press will cut it off. Each channel can be used individually