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Exterior alarm bell box. If a potential intruder tries to enter into a house, they test whether it is closed and locked, uses tools on openings, or/and applies pressure, creating low-frequency sound vibrations. Before the intruder breaks in, the infrasound detector automatically detects the intruder's actions.
The term "false alarm" may actually be semantically incorrect in some uses. For example, a residential burglar alarm could easily be triggered by the residents of a home accidentally. The alarm is not necessarily false – it was triggered by the expected event – but it is "false" in the sense that the police should not be alerted.
The Underwriters Laboratories' UL 365 is a safety standard that governs the construction, performance, and maintenance of police station-connected burglar alarm units and systems. These systems are designed primarily for use in mercantile premises, including mercantile safes and vaults, as well as bank safes and vaults.
Alarm devices, by category, include [citation needed]: burglar alarms, designed to warn of burglaries. This is often a silent alarm; law enforcement or guards are warned without alerting the burglar, which increases the chances of stopping the theft while in progress.
The housing of the bell box may be manufactured from wood, metal, or plastic. The basic core component of a conventional bell box is an electromagnet and a bell or other metal piece, some of which create a repetitive sound. [1] The bell sound is normally created inside the box, although the unit may have bells mounted on the outside of the box.
The company also provides 'security systems' such as access control, CCTV, intruder alarms, fire detection, video analytics and security and building systems integration technology. [78] ' Monitoring and response services' is another core service, where G4S provides key holding, mobile security patrol and response services and alarm receiving ...