A security   alarm   is a system designed to detect intrusion   – unauthorized entry – into a building or area. Security   alarms   are used in residential, commercial, industrial, and military properties for protection against burglary (theft) or property damage, as well as personal protection against intruders. The alarm system control panel is the brain of the system. It carries out the decide function by processing the information it receives from various sensors and responding accordingly. For example, if a door or window is open while the system is disarmed, the control panel ignores the event. But, if a window is opened while the system is armed, it will immediately respond by sending a signal to your alarm monitoring center and triggering an audible alarm. Alarm system panels have built in communicators that transmit and receive signals via a phone line. These signals are sent to a central alarm monitoring center where trained dispatc...