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  2. The Mosquito - Wikipedia

    en.wikipedia.org/wiki/The_Mosquito

    The Mosquito or Mosquito alarm is a machine used to deter loitering by emitting sound at high frequency. In some versions, it is intentionally tuned to be heard primarily by younger people. Nicknamed "Mosquito" for the buzzing sound it plays, the device is marketed as a safety and security tool for preventing youths from congregating in ...

  3. Siren (alarm) - Wikipedia

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

    In a pneumatic siren, the stator is the part which cuts off and reopens air as rotating blades of a chopper move past the port holes of the stator, generating sound. The pitch of the siren's sound is a function of the speed of the rotor and the number of holes in the stator. A siren with only one row of ports is called a single tone siren.

  4. Wikipedia:Free sound resources - Wikipedia

    en.wikipedia.org/wiki/Wikipedia:Free_sound_resources

    Independent, unique sound library with royalty free & free sound effects - for video, sound design, music productions and more. CC0, CC BY Gfx Sounds: Yes Yes Sound library for professional and free sound effects downloads. CC0, CC BY Free To Use Sounds: Yes Yes Sound effects library with hiqh quality field recordings from all around the world.

  5. Warning system - Wikipedia

    en.wikipedia.org/wiki/Warning_system

    A HSS Engineering TWS 295 electronic sirens warning 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 ⓘ Warning light indicating danger of laser exposure

  6. Federal Signal 3T22 - Wikipedia

    en.wikipedia.org/wiki/Federal_Signal_3T22

    The Federal Signal 3T22 was originally designed as the 2T22 in 1952 or 1954. The 2T22 has the same number of ports and cones. It can produce two main signals (it can produce more but the other signals are rarely used), hence the name "2T22" (the 2 at front representing the 2 choppers, and the 22 representing the amount of horns).

  7. The best Bluetooth trackers for finding lost stuff in 2025 ...

    www.aol.com/lifestyle/the-best-bluetooth...

    These plans, priced at $30 and $100 per year, respectively, include benefits like item reimbursement, smart alerts and free battery replacement. These subscription perks are just OK.

  8. Bird in England Mimicking a Police Siren Sounds Just Like the ...

    www.aol.com/bird-england-mimicking-police-siren...

    Bird in England Mimicking a Police Siren Sounds Just Like the Real Thing. Natalie Hoage. April 15, 2024 at 8:30 AM. redpip1984/Shutterstock.

  9. Civil defense siren - Wikipedia

    en.wikipedia.org/wiki/Civil_defense_siren

    Federal Signal Model 5 in Ballston Spa, New York, U.S.. Sirens are sometimes integrated into a warning system that links sirens with other warning media, such as the radio and TV Emergency Alert System, NOAA Weather Radio, telephone alerting systems, Reverse 911, Cable Override, and wireless alerting systems in the United States and the National Public Alerting System, Alert Ready, in Canada.

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