Magnetic Switch Alarm Sensor Overhead Garage Door Contacts With L Bracket
It consist of a reed switch part and a magnet part. When door closed, reed switch is effected by magnet and turn ON; when door open, reed switch is effected by magnet and turn OFF, trigger alarm. L bracket Material : Aluminum.
Magnetic Garage Door Alarm Contact Switch Sensor w/ L Bracket Overhead Door
Used for overhead doors in both industrial and residential situations where a wide gap is present. Adjustable with L bracket to fit most door-channel widths and easy installation. Alloy zinc material case make it quite sturdy.