EASY INSTALLATION-Surface-The touchless hand wave sensor switch for auto door opener is mounted without damage wall or screw mountable, connecting wires with controller of automatic door opener^^TOUCHLESS HAND WAVE SENSOR TO OPEN DOOR-non-touch hand wave sensor to open door, safer for users, widely used for commercial automatic swing door opener and automatic sliding door opener, Wave your hand sensing distance up to 11.81 inch (adjustable) ^^FAST RESPONSE-Powerful red infrared sensor for hands-free control, fast to open door^^EASY TO CLEAN-The touch-free hand wave sensor switch for auto electric door opener has a smooth panel, resistant to dirt, not easy to accumulate dust, easy to clean^^WIRED DESIGN-The infrared sensor switch for auto door openers is wired, without charging or battery replacement, square 3.39 inch large panel