AmpliVox Mity-Meg 25-Watt Megaphone - 25 W Amplifier - Built-in Amplifier - Battery Rechargeable - 8 Hour

Battery indicator lights allow you to quickly monitor battery status Volume/gain knob provides more control over sound Lithium-ion battery eliminates hassle of frequent battery replacement Automatic charge protection stops charging battery when full Weatherproof, high-impact construction offers lasting performance