It can be used in household, stairs, corridor, washroom, toilet, workshop, warehouse, garage, factory lighting, etc. Fast and easy to install, not obstructed by walls, capable of connecting any loads. 4 way ON-OFF Digital Intelligent Wireless Remote Control Switch. Suitable for drop-light, crystal lamp, modern low-pressure lamp, absorb dome light, day flower lamp, fluorescent lamp, energy-saving lamps, exhaust fan, etc. Remote controller and switch can be used simultaneously for ease and flexibility. Stable signal receiving. 1 x 12V 23A battery (not included) is needed for the remote control switch.