What Is a Hand Gear?

The manual alarm does not require a power supply, and can provide an effective alarm in all places without power support. Just by manually shaking the handle clockwise with your hands, the speed can reach the initial level (50-80 rpm) to achieve the ideal alarm effect. The sound is sharp, strong and powerful. The size of the alarm sound depends on the speed of the handle. The new hand-crank alarm has a shutter shutter mechanism in the sound window, which can quickly close the sound window, block the sound, and generate different signals.