Hand Crank Siren Aluminium Alloy 110dB Loud Alarm Air Raid Tornado Siren Horns Alarm for Emergency Feature: 1. Solid Structure: Crafted from aluminium alloy. Composed of a handle and an internal mechanical device, it generates a high frequency alarm when the handle is turned rapidly, effectively drawing attention in an emergency. 2. Compact and Portable: With compact and sturdy design, making it easy to carry and operate, it provides an effective warning in emergency situations, proving indispensable where there's no electricity. 3. Adjustable Volume: The volume can be varied, depending on the speed at which the handle is turned. The faster the rotation, the louder the sound, and a trigger can open the blades to amplify the sound even more. 4. Loud Alarm and Solid Construction: With an adjustable volume that can reach up to 110dB, the hand crank siren offers a sharp, penetrating sound with a large transmission range, making the siren durable and long lasting. 5. Wide Application: Ideal for use in various situations such as sudden fires, attacks, or emergencies, can also be used as a self defense tool, its manual operation allows it to offer an effective alarm without the need for a power source. Specification: Item Type: Hand Crank Alarm Material: Aluminium alloy Weight: Approx. 1833.00g / 64.66oz Mounting Hole Spacing: Approx. 60x60mm/2.36x2.36in Size: Approx. 205x198x115mm / 8.07x7.80x4.53in Communication Method: Sound Transmission Type: Wireless Alarm Host Alarm Method: On site Alarm Sound Pressure Level: 1102dB(A) at 1m Sound Frequency: 55020Hz (Depends on the speed of hand cranking) Structure: Aluminum Alloy Alarm Effective Range: Diameter 1000m / 3280ft Wide Application: Widely used in factories, homes, schools, oil depots, warehouses, flood prevention, disaster relief, public and industrial places, it can quickly alarm in emergency situations and reduce casualties and property losses. Package List: 1 xHandCrankSiren Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.