Portable Hand Crank Siren, Loud 120dB Manual Alarm for Schools, Troops, and Emergency Situations in Construction

1. Portable alarm, easy to use; simply turn the handle to trigger the alarm.
2. The sound of the hand-cranked siren was so loud that it could be heard up to a quarter mile away.
3. The casing is made of metal for maximum strength and durability.
4. Widely used in factories, schools, troops, natural disasters, and by coastal guards, etc., it can effectively provide timely warnings during incidents.
5. Small in size, easy to carry and store, convenient to use, and with good performance.

Specifications:
Item Type: Hand-Crank Siren
Operation Type: Manual Control
Sound Type: Siren
Construction: Metal Casing
Size: Width: Approx. 5.51 inches Height: Approx. 9.09 inches Depth: Approx. 7.95 inches
Decibel: 120 db
Size: Approximately 11 cm / 4.3 inches
23 cm / 9.1 inches
Product Description:
1. The portable alarm is a hand-cranked siren that does not require a power supply. It is called by different names due to local variations.
2. Including the handle, the speed increase mechanism, the slider, the fixed wheel, the ringing wheel, the sound window cover, the gearbox, the gearbox frame, the handle is connected to the drive shaft of the speed increase mechanism and to the output shaft of the speed increase mechanism. The pin is connected to the sliding block, and the sliding block is connected to the wheel flange by friction drive.
3. There is no need for a power supply; power is provided by shaking the handle to trigger the alarm. The sound level depends on the speed of the hand.
4. In terms of function and purpose, it is divided into alarms