Sensors' locations are at the perimeter of the protected area, within it, or both.

Sensors: Devices that detect intrusions.

Some also have their control units built-in to the keypad or other human-machine interface.

Many newer networks often use sealed plastic boxes out in the open. In a modern device, there are typically one or more computer circuit boards inside a metal enclosure. Premises control unit ( PCU), alarm control panel ( ACP), or simply panel: The 'brain' of the system reads sensor inputs, tracks arm/disarm status, and signals intrusions.However, a typical premises security alarm employs the following components: The most basic alarm consists of at least one sensor to detect trespassers and an alerting device to indicate the intrusion. 2.12 Electro-mechanical (shaker) sensors.

2.9 Smoke, heat, and carbon monoxide detectors.

It may even include a two-way voice which allows communication between the panel and monitoring station. These devices can also be complicated, multirole systems with computer monitoring and control. Homeowners typically have small, self-contained noisemakers. There are many types of security systems. Intrusion-alarm systems are combined with closed-circuit television surveillance (CCTV) systems to record intruders' activities and interface to access control systems for electrically locked doors. Some alarm systems serve a single purpose of burglary protection combination systems provide fire and intrusion protection. Prisons also use security systems for the control of inmates. Car alarms likewise help protect vehicles and their contents. Security alerts in neighborhoods show a connection with diminished robbery. Security alarms used in residential, commercial, industrial, and military properties protect against burglary ( theft) or property damage, as well as personal protection against intruders. A security alarm is a system designed to detect intrusion, such as unauthorized entry, into a building or other areas such as a home or school.

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