Hand Crank Siren Horn, 110db Loud Emergency Alarm with Volume and Aluminum Alloy Housing, for Factories Schools Warehouses Emergency Sites

[Hand Crank Siren Horn] The hand crank siren horn is manually operated, requiring no power source, providing timely warnings in areas without electricity, suitable for emergencies. [ Volume] The volume can be adjusted, determined by the crank speed, the the crank, the louder the sound. Press trigger to open blade and emit loud sound. [High Performance] The volume can achieve 110 dB and the sound transfer Diameter is up to 0.62 miles. Its sharply, penetrating sound ensures effective warning effect. Item Type: Hand Crank Siren Horn Material: Aluminum Alloy Model: SY-100 Effective Range: Diameter more than 1000m Sound : 110+Celsius-2dB Sound Frequency: 550+Celsius-20Hz (Depends on the hand cranking speed) Rated Speed: more than 2000 RPM Hand Crank Direction: Clockwise Application: Engineering, schools, military, flood control, disasters and other emergency sites