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2. PASS device - Wikipedia

   en.wikipedia.org/wiki/PASS_device

   A PASS device (personal alert safety system), also known as a distress signal unit (DSU) or ADSU (automatic distress signal unit), is a personal safety device used primarily by firefighters entering a hazardous or "immediately dangerous to life and health" environment such as a burning building.

3. 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. In some versions, it is intentionally tuned to be heard primarily by younger people.

4. Chrysler Air-Raid Siren - Wikipedia

   en.wikipedia.org/wiki/Chrysler_Air-Raid_Siren

   Its six horns are each 3 feet (91 cm) long. The siren has an output of 138 dB(C) (30,000 watts), and can be heard as far as 25 miles (40 km) away. In 1952, the cost of a Chrysler Air Raid Siren was $5,500 [1] (equivalent to $65,076 as of May 2024). The United States government helped buy sirens for selected state and county law enforcement ...

5. 'Never felt safer': This personal safety alarm is the perfect ...

   www.aol.com/lifestyle/never-felt-safer-personal...

   Being alone can be unnerving, but this personal safety alarm can bring peace of mind. 'Never felt safer': This personal safety alarm is the perfect Mother's Day gift — just $25 Skip to main content

6. Q2B - Wikipedia

   en.wikipedia.org/wiki/Q2B

   The Q-siren produces 123 decibels at 10 feet (3.0 m) with an operating current of 100 amps at 12 V DC (1.2 kW). [1] Hearing protection is recommended but not required when operating the siren or for anyone in the truck. The Q2B is mounted outside the truck, usually in the front bumper, on top of an extended front bumper or on the grill.

7. Fire alarm notification appliance - Wikipedia

   en.wikipedia.org/wiki/Fire_alarm_notification...

   95 dB @ 3,100 Hz tone are used in many current notification devices. [1] 80 dB @ 520 Hz tone are used in newer notification devices. [1] 70 dB to 100 dB weighted for human hearing (higher decibels, in the 100 to 115 dB range, were common with older electromechanical horns) [citation needed] Light (visible signals) 15 cd to 1,000 cd candela ...