The photo eye sensor is one of the most important parts of your garage door system.
Garage door photo eye beam width.
Higher than that can miss many low lying objects including pets.
The second is photoelectric.
The photo eye of an automatic opening garage door is a safety feature.
If your garage door sensors are outside of this range remove them entirely from the garage door frame and install leveled inside the safe zone.
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Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
One unit emits an infrared beam invisible to the naked eye.
They shoot an invisible beam between them which will sense if something is between them as it breaks the beam.
The other unit is a reflector.
Lower is easy to stand above with a foot on either side.
It consists of two units installed about 4 inches from the floor on each side of the door.