ALEKO Gate Opener Safety Reversing Reflective Sensors Photo Beam Infrared Sensor Reflector Photo Eye Create an invisible security barriers for driveways, gates or garages Pre-wired cord with SPDT normally closed and normally open relay outputs Adjustable sensing distance. 12/24 DC or AC voltage Compatible with all ALEKO gate opener models and other brands Weatherproof rating for outdoor applications. 10 Meters (33 Feet) Range