Origin:Mainland China Product name:Hand crank alarm Material:aluminum alloy Size:231x202x115mm Power:manual Color:red, army green Sound:110dB Features:no electricity, loud, portable Applicable scenarios:air raid, fire, flood disaster warning Hand Crank Siren Horn 110dB Manual Metal Alarm Air Raid Emergency Safety Warning Siren for Fire Flood Prevention Disaster NoteThe product have 2 colors red and green, please choose the color what you want , otherwise we will send it in random colors Specification Product name: Hand crank alarm Material: aluminum alloy Size: 231x202x115mm Power: manual Color: red, army green(optional) Sound noise: 110dB Features: no electricity, high volume, portable Applicable scenarios: air raid, fire, flood disaster warning Features Handle and Cranking Lever Folds. No Power Supply Required. Compact for Portability. Powerful Universally Recognized Sound. Manual Hand Crank Operated Air Raid Siren. Produces a loud adjustable sound of 110 decibels. Made out of durable aluminium alloy. Ideal for getting peoples attention, or rooting for your favorite team in sporting events, and many more applications. By manually rotating the handle, the gearboxs of the transmission step by step acceleration to achieve the purpose of sound, the sound depends on the rotation speed of the handle. Package Include 1x Hand crank alarm