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The manual alarm siren plays a key role in protecting people. In the event of extraordinary events or threats, the warning siren is ideal for alerting This hand operated lightweight siren produces a loud adjustable sound of 110dB ideal for getting people attention on camps, schools, while cheering your Manual Hand Crank Operated Air Raid Siren. Will produces a loud adjustable sound of 115 DB. Made out of metal housing. Ideal for getting peoples attention, Hand Operated Siren. ? 4,500 Get Latest Price. Material: Aluminium Casting. Automation Grade: Manual. Surface Treatment: Paint Coated. Alarm Volume: 10db. ?Robustness and portability: Hand-operated sirens are lightweight, easy to carry, detachable, and sound an alarm when the handle is held. The hand-cranked VXS-1000P Hand Crank Siren. How loud is a train horn?. Be suspicious at any claim above 150dB (If you are unsure, search the web for: "how loud areBuy Hand Crank Siren Horn Manual Operated Metal Alarm Handheld Air Raid Siren Portable Loud Manual Siren Emergency Safety (Green): Horns & Sirens Manual Hand Crank Operated Air Raid Siren. Will produces a loud adjustable sound of 110 decibels. Made out of durable plastic (ABS) housing.