Product descriptionMaterial: aluminum alloyRed colorDimensions (approx.):Length: 115mmWidth: 202mmHeight: 9.1 "Operation: hand lever operatedSound output: 110 2 (dB)Audio frequency: 550 20 (HZ)Transmission distance: 1000 (m)Handle and crank lever folds.No power supply required.Compact for portability.Quantity: 1 pieceDelivery content:1 x air alarm1. The hand siren crank does not require a power supply Manual air raid siren with winch drive. Produces a loud demodulated sound of 110 decibels. By manually turning the handle, the gear will gradually accelerate the gear for sound purposes, and the sound will depend on the speed of the handle.2. Compact and portable hand crank siren The handle and lever are folded for easy carrying over the supplied hip pouch. Made of durable aluminum alloy. Strong, widely recognized voice.3. Great for getting people"s attention or searching for your favorite team through sporting events and other apps.4. This hand operated light siren produces 110 decibels This is a powerful, adjustable sound that draws attention to refugee camps and schools, and whether you are cheering or your favorite team at a local sports game. You need to listen to a valid warning.5. By manually rotating the handle the gear of the gearbox step by step acceleration, in order to achieve the purpose of the sound, the sound depends on the speed of the handle.About Shipping: All items will be shipped within 3 business days after the payment is received. Most times you will receive them within 8-12 days then. The specific delivery time is depend on circumstances.Any questions, please feel free to contact usDuring the shopping process, if you have any questions, please feel free to consult us, we will reply you within 24 hours, wish you a happy shoppingThanks for your cooperation and we'll make you feel satisfied.