Megaphone is lightweight and powerful with new Piezo dynamic technology. Comfortable pistol grip and 3 modes: Talk siren and whistle - up to 1 Mile (1760 Yards) Sound coverage. Weatherproof high plastic and steel. Battery indicator light (low, med., hi) on the outer housing. Easy to use battery cartridge. Volume/gain knob inside the cover for more control over the sound. Requires 8 C-Cell batteries. Lasts up to 40 hours continuously. Half the weight and twice the battery run time of other megaphones. 8-1/4" in Height.