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Abstract : Burglar (or intrusion), fire, and safety alarms such as home security system are electronic alarms designed to alert the user to a specific danger.
Sensors are connected to a control unit via low-voltage wiring or a narrowband RF signal which is used to interact with a response device. The most common security sensors are used to indicate the opening of a door or window or detect motion via passive infrared (PIR).
New construction systems are predominately hardwired for economy. Retrofit installations often use wireless systems for a faster, more economical installation.
Some systems serve a single purpose of burglar or fire protection. Combination systems provide both fire and intrusion protection.
Systems range from small, self-contained noisemakers, to complicated, multi-zoned systems with color-coded computer monitor outputs.
Many of these concepts also apply to portable alarms for protecting cars, trucks or other vehicles and their contents (i.e.,” car alarm").
See also fire alarm control panel for specific fire system issues. Burglar alarms are sometimes referred to as alarm systems, see burglar alarm control panel a discussion of hard-wired burglar alarm system design.
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