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 AAbatteries (sold separately). Pistol grip and wrist strap. Weighs only 1.5 lbs. 7-3/4diameter; 12length.