Features:

Handle and Cranking Lever Folds.
No Power Supply Required.
Compact for Portability.
Powerful Universally Recognized Sound.
Manual Hand Crank Operated Air Raid Siren.
Produces a loud adjustable sound of 110 decibels.
Made out of durable aluminium alloy.
Ideal for getting peoples attention, or rooting for your favorite team in sporting events, and many more applications.
By manually rotating the handle, the gearbox of the transmission step by step acceleration to achieve the purpose of sound, the sound depends on the rotation speed of the handle.

Specification:

Material: Aluminium alloy
Operation: Manual hand lever operated
Color: Green
Sound output: 110±2(dB)
Audio frequency: 550±20(HZ)
Transmission distance: 1000(Φm)
Dimensions
Length: 115mm/4.5"
Width: 202mm/8"
Height: 9.1"

Operation steps:

1 Grab the grabbing handle in left hand and open the air door (adjust the air door according to the direction of motion to control volume of the sound);
2,Turn the rocking handle clockwise with right hand till you hear the sound

Package Included:

1 x Air Raid Alarm