Receiver indicator picks up a signal from the sensor and tells you by way of colored led s and perhaps a beep the current state of your garage door it s open or it s closed.
Garage door closed sensor.
With some garage door open monitor examples the indicator unit plugs into a wall outlet.
Door open chime entrance entry alert chime wireless door bell open sensor for home business garage retail store apartment office 2 receiver 2 magnetic sensor led flash 4 3 out of 5 stars 77 28 59 28.
The sending sensor shoots out an invisible beam which needs to make a connection with the receiving sensor in order to complete the circuit which allows the garage door opener to close.
It is a beneficial device if you have kids or pets in your house.
The working of these sensors is quite simple.
The garage door sensors are the safety add on to your garage doors.
This safety feature was made standard in the early 1990s to avoid unnecessary injuries.
It prevents the doors from automatically closing when anyone is in the doorway.
The sensor can t actually control your garage door like the chamberlain myq garage 55 at amazon door opener but whereas the chamberlain smart garage is 130 roost s sensor is only 40.