The second is photoelectric.
Garage door photo eye beam width.
Lower is easy to stand above with a foot on either side.
Proper height for a garage door sensor is 4 to 6 inches 10 2 to 15 2 cm.
It consists of two units installed about 4 inches from the floor on each side of the door.
The photo eye sensor is one of the most important parts of your garage door system.
Higher than that can miss many low lying objects including pets.
They shoot an invisible beam between them which will sense if something is between them as it breaks the beam.
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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.
If the photo eye senses an obstruction it stops the door from closing and potentially prevents damage or injury to a vehicle.
These sensors sit either side of your garage door near the ground.
The photo eye of an automatic opening garage door is a safety feature.