A
burglar alarm is a system
designed to detect intrusion – unauthorized entry – into a building or area.
They are also called security alarms,
security systems, alarm systems, intrusion detection systems, perimeter detection systems, and similar terms.
Burglar
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 of inmates.
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.
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