The LK-100 manual alarm does not require power support and provides an effective alarm signal by shaking the handle to provide power. The size of the sound depends on the speed at which the handle is shaken. Set up a shutter mechanism in the sound window to select the strength of sound signals, quickly close the sound window, block sound, and generate different signals. LK-100 Hand Shake Alarm Structure: Aluminum Alloy Alarm Net Weight: 1.2kg Packaging Size: 186× 186× 170mm effective range: A 500m diameter hand operated alarm is a type of hand operated sounder that does not require power support. Its name varies depending on the location (hand operated alarm, manual alarm, manual alarm, portable alarm, no power alarm)& nbsp; It includes a handle, gear speed increasing mechanism, clutch slider, fixed wheel, ringing wheel, sound window cover, gear box, and box frame. The handle is connected to the driving shaft of the gear speed increasing mechanism, the output shaft of the gear speed increasing mechanism is connected to the clutch slider through a pin, and the clutch slider is connected to the flange friction transmission of the impeller. Its purpose is to provide power without the need for power support, and to make the alarm sound an alarm signal by shaking the handle. The sound level depends on the hand cranking speed& nbsp; It can be divided into fixed hand alarm and portable hand alarm in terms of style and purpose& nbsp; Hand cranked alarms are available in sizes of 1.2 kilograms and 9 kilograms. They are lightweight, easy to carry, and can be disassembled and stacked. When the hand handle is activated, an alarm sound will sound. After the Wenchuan earthquake and during the treatment of the barrier lake, this type of manual alarm played a positive role because power and traffic were blocked, and other mobile alarms could not enter the alarm area. The lightweight and portable manual alarm became the alarm& nbsp;