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  2. Electromagnetic door holder - Wikipedia

    en.wikipedia.org/wiki/Electromagnetic_door_holder

    A simple electromagnetic door holder consists of a strong electromagnet, usually attached to a wall or mounted in a floor pedestal enclosure, next to the door it controls. The mechanism may be mounted near the floor, at the upper corner of the open door, or at any convenient height along the latch edge (away from the hinged edge).

  3. Security alarm - Wikipedia

    en.wikipedia.org/wiki/Security_alarm

    Wireless home alarm system control panel A house alarm. A security alarm is a system designed to detect intrusions, such as unauthorized entry, into a building or other areas, such as a home or school. Security alarms protect against burglary or property damage, as well as against intruders.

  4. List of sirens built by Alerting Communicators of America

    en.wikipedia.org/wiki/List_of_sirens_built_by...

    This siren is similar to Federal Signal's Thunderbolt series. Only a single unit remains in service in Milwaukee, WI. Screamers Electro-Mechanical 2, 5, 7.5, 10 8, 9, 9/12, 10/12 1968–1994 Omni Directional 102–115 dB at 100 ft. Series of small vertical sirens, comparable to Federal Signal Corporation's vertical sirens. Sentry 95

  5. Fire alarm system - Wikipedia

    en.wikipedia.org/wiki/Fire_alarm_system

    In the United Kingdom, fire alarm evacuation signals generally consist of a two-tone siren with visual notifications in all public and common-use areas. Some fire alarm devices can emit an alert signal, which is generally used in schools for lesson changes, the start of morning break, the end of morning break, the start of lunch break, the end ...

  6. Siren (alarm) - Wikipedia

    en.wikipedia.org/wiki/Siren_(alarm)

    Electronic Sirens Pavian by Telegrafia A Whelen WPS electronic siren imported to Saudi Arabia by HSS Engineering for use as a civil defense siren. There are 8,200 alarm sirens for civil protection throughout Switzerland. They are tested once a year, on the first Wednesday in February. [1] Sound sample ⓘ An 1860s-era siren. [2]

  7. List of civil defense sirens - Wikipedia

    en.wikipedia.org/wiki/List_of_civil_defense_sirens

    Sentry Siren; SiraTone This page was last edited on 5 August 2024, at 16:06 (UTC). Text is available under the Creative Commons Attribution-ShareAlike 4.0 License ...

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