The Digi-Code CR-2149 Universal Safety Beam Sensor kit includes: Two mounting brackets, one sender and one receiver sensor, four screws and complete installation instructions. If your garage door opener originally came with safety sensors, these universal sensors are a perfect replacement.
This Universal Safety Beam kit has a self programming feature that allows you to wire these new sensors to the existing wiring, mount them to the wall and your job is done. You do not have to worry about hooking them up backwards because they are non-polarized.
