Liftmaster OEM Genuine Parts 41A4373A Safety Sensor Eyes For garage door openers that currently have sensors installed 41A4373A Sensors are compatible with LiftMaster and Chamberlain Brand from 1993 - late 1990's Each sensor has a green light and a bolt that runs right through the center of each sensor Designed to splice into your existing wires Includes 1-sending unit, 1-receiving unit, Wire connectors, and instructions - no brackets