www.symetrix.com.au All alarms use sensors connected to a control unit via hardwire or wireless link. Sensors commonly detect changes in the environment such as the opening of a window or inside motion. Types of alarm systems range from small, all-in-one sirens to sophisticated, multi-zoned systems. The most basic alarm systems feature elements including a control panel, keypad, siren, indoor motion detector, door and window contacts, and a monitoring station, if the system is monitored. More sophisticated features that can be added include glass break detectors, remote controls and panic buttons.

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