110 dB hand-cranked siren, portable, manually operated air raid siren, emergency fire alarm with table clamp, aluminum alloy 990633

Technical Specifications:
Sound level: 110 ± 2 dB(A) at 1 m distance
Output frequency: 550 ± 20 Hz (depending on hand speed)
Effective range (diameter): 1000 m (outdoors)
Net weight: 2.2 kg
Features:
No power supply required.
Compact for mobile use.
Table clamp.
Well-known, powerful sound.
Air raid siren with hand crank.
Produces a loud, adjustable tone of 110 decibels.
Made of robust aluminum alloy.
Ideal for attracting attention or cheering on your favorite team at sporting events, and for many other applications.
By manually turning the crank, the drive's gears gradually accelerate to achieve the desired sound level. to achieve. The volume depends on the speed of the handle rotation.