15W piezo dynamic megaphone

15W piezo dynamic megaphone New Piezo technology is powerful, energy efficient and lightweight Adjustable volume and three modes (talk, siren and whistle) Technology significantly reduces weight and increases battery life Full frequency response; weatherproof design Up to 5/8 mile range. Lasts 18 hours continuously with 8 "AA" batteries (sold separately). Pistol grip and wrist strap. Audio Range: 5/8 mi; Weight: 1 1/2 lb; Diameter: 7 3/4 in; Length: 12 in.