Universal Compatibility - Garage door sensor replacement Kit Fit for Liftmaster Sears Chamberlain Craftsman Master Mechanic Wayne Dalton after 1997. Our garage door openers perfectly replaces the original sensor..Easy to install - The Safety sensor kit 41A5034 Includes 2 safety sensors (with attached wires), 2 mounting brackets. Our product comes with an installation manual and fixing bolts required for installation. One person can complete the installation manually, saving you installation costs..Safety Garage Door Sensor - Garage door opener kit 41A5034 monitors the garage door opening for obstacles, the garage door automatically reverses before causing any damage to prevent accidents..Package Includes- The sensor kit contains 2 safety sensors (sending & receiving) with wires, 2 pairs of screws & wing nuts, 5pcs round head bolt and 1 Detailed installation instructions..Excellent After-Sales Service - Please make sure disconnect the power from door openers before installing. Our garage door opener kit provide a two-year warranty service, If you have any questions about the use or purchase of the product, you can communicate with us at any time.