Garage: Photo Electric Eyes
The photo eye sensors on garage doors are located about six inches above the ground, one on either side of the garage door. These sensors send out an invisible beam that connects them.
The way they function is quite simple. If anything interrupts the beam so that the two sensors are not in contact, the sensor signals the system to break the circuit so the door cannot close.
Check out this article for more info: https://tinyurl.com/2jbbn4xb
Arkansas Licensed Home Inspector HI-2202
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