Piezo Power Megaphones

New Piezo technology is powerful, energy efficient, significantly reduces weight and increases battery life. 25W has up to one mile range; weights only 2 lbs; 8 1/4" Dia.x14 1/2" L; requires 8 C-cell batteries (not included). Adjustable volume and three modes (talk, siren and whistle). 15W has up to 5/8 mile range; weighs 1.5 lbs.;7 3/4" Dia.x12"L (requires 8 AA batteries, not included). Weatherproof design.