Lightweight and powerful with Piezo microphone technology provides up to 40% longer battery life. Comfortable pistol grip and 3 modes, talk, siren and whistle, Effective range up to one mile (1760 yards). Weatherproof high impact plastic and steel battery indicator light shows power status (low, med, hi) on the outer housing. Easy to use battery cartridge. Volume/gain knob inside cover for more control over sound. Shoulder strap. Requires 8 C-cell batteries or optional S1405 rechargeable Lithium Pack. Lasts up to 40 hours continuously on 8 C-cell batteries and 8 hours on S1450 rechargeable Lithium Pack. Half weight and twice the battery run time of other megaphones. Net weight 2.5lbs without batteries.