... warning, non-false alarm. Widely used for rolling door, shutter door, garage door.Specification: 1. Triggered distance :< 6 cm2. Working ... you are on the 8th floor, but your garage is on the first floor. You can install ... your home, and extend the wire into the garage.5. Open the cover of transmitter, fix ... means normal work.7. After installation, open the door, the signal LED flashes about one second, it ...