25W piezo dynamic megaphone

25W 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 one mile range. Lasts 40 hours continuously with 8 "C" cell batteries (sold separately). Pistol grip and wrist strap. Audio Range: 1 mi; Weight: 2 lb; Diameter: 8 1/4 in; Length: 14 1/2 in.