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A voice-activated radio-dispatched alarm, or VARDA-alarm, is a type of burglar alarm that, when activated or "tripped", broadcasts the type of the alarm and the transmitter location over the local police radio frequency using a pre-recorded audio message. [1] In 1968, the voice-activated radio dispatched alarm (VARDA), was invented.
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.
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In the 1920s, Guardian Alarm founder Milton Pierce designed and installed his first burglar alarm in his father's Detroit tailor shop and then went on to work for a local alarm company. In 1930, Pierce quickly went into business for himself when he purchased Guardian Alarm, then a fledgling company with only 60 customers.
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 ...
ADT began to expand into new areas, such as fire alarms and security alarms, between 1910 and 1930, but was kept separate from AT&T's Holmes alarm business. ADT became a publicly traded company in the 1960s. [12] In 1964, ADT was found to be a monopoly in restraint of trade. It was shown to provide almost 80% of the central station alarm ...