Chamberlain Liftmaster - Garage Door Monitor CLDM1 / 916LM OEM NEW

The Liftmaster 916LM sensor is battery operated and attaches to the back of any garage door.
The sensor sends a wireless signal to the receiver that shows the status of the door.
The receiver is powered by the included wall transformer.
Units are pre-programmed and tested.
OEM manufactured by Chamberlain/Liftmaster (who have the same parent company)