What is Door/Window Contact?
Consists of an alarm transmitter and a magnet. The transmitter should be installed on the door or window frame while the magnet should be installed on the door or window. Installing them in the opposite position would increase the chances of a broken alarm transmitter as the door may slam and rattle the sensitive circuit board. When the door or window is closed the magnet is aligned with the transmitter and the zone is closed. If the window or door is opened the magnet becomes unaligned and you have an open zone. When the security system is armed and a door/window contact has an open zone, an alarm signal is generated.
Door/window contacts are considered perimeter protection and most alarm companies recommend installing a door/window contact on every accessible door or window.