Universal Compatibility - The sensor replacement kit is compatible with Sears Master Mechanic and (1997-Current) garage door openers.Easy to Install - The clear manual will help you replace your old sensor or on the floor. The sending sensor (yellow light) send an invisible light beam to the receiving sensor (green light) when the sensors detect an obstruction, then the door will automatically stop closing and reverse direction.Please Note: The kit replaces parts for 41A5034 safety sensors and 41A5266-1 brackets (NOT suitable for 041A4373A). Your garage door openers must have the black brackets and safety sensor that clip onto the garage door track.Package - The sensor kit contains 2 safety sensors (sending and receiving) with wires, 2 pairs of screws and wing nuts, 5pcs round head and 1 manual.Tips - Please make disconnect the power from door openers installing. The sensor beam must install not higher than 6 inch (15cm) above the garage door.color:As shownMaterial:plasticPackage Contents:1 x sensor replacement kit1 x English manualOnly the above package content, other are not included.Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is 1-3cm.