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  2. Optical turnstile - Wikipedia

    en.wikipedia.org/wiki/Optical_turnstile

    Optical turnstiles are usually a part of an access control system, which also consists of software, card readers, and controllers. Optical turnstiles operate much like regular mechanical turnstiles, except that they rely primarily on electronic beams, and audible/visual interfaces to control entry. Rather than physically restraining a person ...

  3. Alarm device - Wikipedia

    en.wikipedia.org/wiki/Alarm_device

    An alarm device is a mechanism that gives an audible, visual, combination, or other kind of alarm signal to alert someone to a problem or condition that requires urgent attention. Etymology [ edit ]

  4. Emergency communication system - Wikipedia

    en.wikipedia.org/wiki/Emergency_Communication_System

    An emergency communication system may be composed of a product and its associated hardware and software, as owned by the entity using it (e.g., an on-site paging network), or as a service owned and provided by a third-party (e.g., a cellular carrier's SMS network). Each have their own advantages and disadvantages; however, despite perception ...

  5. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    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.

  6. Wireless security camera - Wikipedia

    en.wikipedia.org/wiki/Wireless_security_camera

    Analog wireless is the transmission of audio and video signals using radio frequencies. Typically, analog wireless has a transmission range of around 300 feet (91 meters) in open space; walls, doors, and furniture will reduce this range. Analog wireless is found in three frequencies: 900 MHz, 2.4 GHz, and 5.8 GHz.

  7. Monitronics - Wikipedia

    en.wikipedia.org/wiki/Monitronics

    As of 2015, it was the second largest security alarm monitoring company in the United States, behind ADT. [ 5 ] In 2013, MONI purchased Security Networks, a network of about 225 security dealers, for $507 million to diversify its service offerings and enter into the developing and complementary DIY home service category.

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