SUDEG Hand Crank Siren Horn Portable 110dB Manual Operated Metal Alarm Air Raid Emergency Safety Alarm Green

The hand crank alarm is small, lightweight, portable and easy to install; No tools are required; It only needs 0.15 square meters and a stand for one person to work properly, and is very portable for operation Widely used in factories, schools, open-air military camps, mountain rescue and anti-ship vessels, ships, mines, plains, pastures, gas stations, airports, forest farms, hotels, etc The hand crank alarm requires no power supply and can provide an effective alarm in places where there is no power supply When power and traffic are blocked, other mobile alarms can not enter the alarm area, and the portable and practical hand crank alarm becomes a very practical alarm The desired alarm effect is achieved by simply manually shaking the handle clockwise at a primary speed (50-80 rpm), producing a majestic sound with a large shock and long wavelength, Weight: 2.425084882 pounds, Manufacturer: SUDEG