The idea is to connect them to an existing alarm system.
Roller garage door alarm contacts.
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How contact sensors work.
You can attach alarm contact sensors to any door or window in your house or apartment and when armed you ll get instant alerts on your phone and tablet whenever they open.
The sensor box typically goes onto the garage doorframe.
2 pack overhead garage door floor alarm switch contact sensor track mounted.
There are two types of door alarms i e contact and tilt.
Garage door alarm sensors.
Contact sensors come in two parts namely the sensor box and a magnet.
It consists of a switch and a magnet just like any standard door or window contact used for an alarm system.
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Seco larm sm 226rq enforcer overhead door mount magnetic contact closed loop adjustable to fit most door channel widths 2 3 4 70mm gap 24 61cm wire leads enclosed in armored cable.