Security Alarm

A security alarm, also called a burglar alarm, is a system built to detect an intrusion such as an unauthorized entry into a building or another protected area, guarding against burglary, theft, property damage, and intruders in settings ranging from a private home or school to a vehicle or a prison. Some systems are built only to detect burglary, while others combine burglary detection with fire detection, closed circuit television surveillance, and electronic control of locked doors within one installation. A residential system is often a small self contained noisemaker, while an installation for a business or institution can be a much more complex system with computer monitoring, control, and two way voice contact with a monitoring station. The source consulted for this entry gives no specific date or inventor for the security alarm, so its origin and early development are left for the depth wave to source.