Features: Used for emergency alarm, easy to carry. Can be used in homes, schools, flood control, disaster relief, public and industrial situations. Call the police promptly to reduce property losses and casualties. By manually rotating the handle, the transmission device of the gearbox accelerates step by step to achieve the purpose of making sound. The size of the sound depends on the rotation speed of the handle. Made of durable aluminum alloy, strong and wear-resistant. Note: Due to different monitors and light effects, the actual color may be slightly different from the image, please allow 1-3 cm deviation due to manual measurement Specifications: Material: Aluminum Alloy Dimensions: 231x202x115 mm Included: 1 Alarm