|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. Car alarms likewise protect vehicles and their contents. Prisons also use security systems for control ofinmates.|
|Some alarm systems serve a single purpose of burglary protection; combination systems provide both fire and intrusion protection. Intrusion alarm systems may also be combined with closed-circuit television surveillance systems to automatically record the activities of intruders, and may interface to access control systems for electrically locked doors. Systems range from small, self-contained noisemakers, to complicated, multi-area systems with computer monitoring and control.
In addition to the system itself, security alarms are often coupled with a monitoring service. In the event of an alarm, the premises control unit contacts a central monitoring station. Operators at the station see the signal and take appropriate action, such as contacting property owners, notifying police, or dispatching private security forces. Such signals may be transmitted via dedicated alarm circuits, telephone lines, or Internet.