Forget about worrying about your wireless alarm system being hacked. The door/window contact is a compact solution to a growing concern around wireless alarm system hacking. Forget the wires and jump into the future without sacrificing your security and “peace of mind.” There is a built-in reed switch for wireless protection and a pair of screw terminals inside the device designed to integrate a wired contact. You can setup two separate zones or choose just one. The most common application is the fully wireless option. There is a maximum spacing gap of one inch between magnet and reed switch. This means when the door/window is closed the magnet must be within this distance. You can also hard wire a Normally Closed (NC) contact to the door/window contact.