The burglar alarm system consists of devices that detect unauthorized entry. The control panel is the brains of the system. When it detects an emergency, it calls a monitoring station, which immediately alerts proper authorities.
The keypad located at entrances allows you to arm and disarm the security system. Door contacts are magnetic devices that trigger the alarm system when opened. Motion sensors are interior protection devices which detect changes in infrared energy levels. Glassbreak detectors identify the sound of breaking glass. Sirens and strobes are attached to the interior and exterior of the building to draw immediate attention to the intrusion.
These systems are equipped with battery or cellular backup systems which operate immediately should the building lose power or have its phone lines cut.