LIFTMASTER GARAGE DOOR SENSOR WIRING DIAGRAM

How to Wire a Sensor for a Genie Garage Door | Hunker
Garage door openers include a photo-electric sensor system to help prevent damage to the door or opener. The sensor emits an infrared beam that when broken, causes the opener to stop closing the door and reverses the movement back to the open position. Wiring a sensor for a Genie garage door opener is much like any other opener.
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