1、ADJUSTABLE AND LOUD ALERT: The volume of the alarm can be adjusted depending on the speed at which the handle is turned. Simply crank the device to activate the on site alarm and produce an even louder sound. The alarm can reach a volume of more than 110db. 2、ALUMINUM ALLOY CONSTRUCTION: This hand crank alarm features a sturdy aluminum alloy structure and coated with anti rust paint, making it strong, anti damage and waterproof. Its durability ensures a long service life. 3、URGENT REMINDER: Featuring a handle and an internal mechanical device, the alarm can generate high frequency sound waves to emit a loud noise by simply cranking the handle. With its high volume, it effectively alerts people in emergency situations. 4、EFFICIENT AND PORTABLE: The aluminum alloy emergency safety manual siren boasts a compact and sturdy design, making it easy to carry and operate. This makes it ideal for alerting people to emergency situations in large areas such as factories and public spaces. 5、VERSATILE APPLICATION: Suitable for various scenarios including sudden fires, attacks, and emergency distress signals. The alarm can be used as a self guard tool to deter potential attackers or attract others for help, ensuring individual safety. Item Type: Hand Crank Alarm Material: Aluminum Alloy Communication Method: Sound Transmission Alarm Type: On Site Alarm Volume: ≥110db Sound Frequency: 550±20Hz (Depends on the speed of hand cranking) Effective Range: Diameter 1000m Product Dimension: Approx. 231x202mm / 9.09x7.95in Wide Application: Widely used in factories, homes, schools, oil depots, warehouses, flood control, disaster relief, public and industrial places. It can timely sound the alarm in emergency situations, reducing casualties and property losses. Weight: Approx. 1550.00g / 54.67oz 1 x Hand Crank Alarm 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. Sold by-YJL official store