Model: red hand-crank siren, portable, manually operated,feature:1.Portable alarm, easy to operate, just turn the handle to sound the alarm. two.Portable hand-held sirens are so loud they can be heard up to 1/4 mile away. 3. The outer shell is made of durable metal for maximum strength and durability.4.Widely used in factories, schools, military units, natural disasters and seaside guards, etc. Ability to effectively issue timely alerts when events occur.Small size, easy to carry and store, easy to use and good performance.Specifications: TypeItem: Crank Siren TypeOperation mode: Manual operation typeSound: SirenStructure: MetalBox Dimensions: Width: Approx. 5.51 inches Height: Approx. 5.51 inches 9.09 inches Depth: Approx. 7.95 inchesDecibel: 120 db Size: approx. 11 cm/4.3 inches 23 cm/9.1 inches Product Description: 1. The portable alarm is a hand-cranked alarm that does not require power support. Due to differences in different places, their names are also different.two.It includes a handle, a gear speed-increasing mechanism, a slider, a fixed wheel, a rotating wheel, a sound window cover, a gear box, and a box frame. The handle is connected to the transmission shaft of the speed-increasing mechanism, and the output shaft of the gear speed-increasing mechanism passes through. The pin shaft is connected to the slider, and the slider is connected to the impeller flange through friction transmission. 3. No power supply is required. The alarm can send out an alarm signal by shaking the handle to provide power. Sound level depends on hand speed.4.According to style and purpose, they are divided into fixed manual alarms and manually operated portable alarms. 5.The hand-operated alarm is light in weight, easy to carry, and detachable, and the handle will sound an alarm. 6.It is widely used in emergencies such as factories, schools, troops, special flood control, natural disasters, open-air barracks, and civil air defense. 7. Effective and timely early warning can be provided when an incident occurs to reduce peoples property losses and casualties.packing list:1 x crank alarm.notes:Please note that old and new models of this product are shipped randomly, please make sure you dont mind before placing an order.