burglar alarm

n. electronic device that makes a loud noise and warns of forced entry (when a window or door is opened or tampered with as by a burglar); loud warning sound produced by a burglar alarm

"Silent alarm" redirects here. For the album, see Silent Alarm (album). Burglar (or intrusion), fire and safety alarms are found in electronic form today. Sensors are connected to a control unit via either a low-voltage hardwire or narrowband RF signal, which is used to interact with a response device. The most common security sensors indicate the opening of a door or window or detect motion via passive infrared (PIR). In new construction systems are predominately hardwired for economy while in retrofits wireless systems may be more economical and certainly quicker to install. Some systems are dedicated to one mission, others handle fire, intrusion, and safety alarms simultaneously. Sophistication ranges 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 alarms"). 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 for a discussion of hard-wired burglar alarm system design.
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Noun
1. a loud warning signal produced by a burglar alarm; "they could hear the burglar alarm a mile away"
(hypernym) alarm, alert, warning signal, alarum
2. a warning device that is tripped off by the occurrence of a burglary
(hypernym) alarm, warning device, alarm system

burglar-alarm
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