... , low battery warning, non-false alarm. Widely used for rolling door, shutter door, garage door.Specification: 1. Triggered distance :< 6 cm2. Working voltage12V ... magnetic part: It should be installed in the motion door and keep it parallel with the side of the base ... flashes, it means normal work.7. After installation, open the door, the signal LED flashes about one second, it means installing ...