Some insurance companies and local agencies require that alarm systems be installed to code or be certified by an independent third party. The alarm system is required to have a maintenance check carried out every 6 – 12 months (in the UK, 'Audible Only' intruder alarm systems require a routine service visit once every 12 months and monitored intruder alarm systems require a check twice in every 12-month period) to ensure all internal components, sensors and PSUs are functioning correctly. In the past, this would require an alarm service engineer to attend site and carry the checks out. With the use of the Internet or radio path and a compatible IP/radio transmitting device (at the alarmed premises) some checks can now be carried out remotely from the central station.
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