The replacement kit includes the Sending Sensor (with an amber LED), Receiving Sensor (with a green LED), 2' of conductor wire, (5) wire connectors, (2) wingnuts, and (2) 1/4-20" round head bolts.
For use with all Garage Door Openers made after 1997. This is a required safety device that MUST be connected and aligned correctly before the garage door opener will move in the down direction.