PYLE-PRO PWMA60US 50 Watts Portable USB Waist-Band PA System with Headset Microphone, Rechargeable Batteries (Color Silver) Listen to Your Music or your recordings With the USB Input Small Super Powerful Voice Amplifier - AUX Input For MP3 Player Or iPod - Unit Includes Charger Belt Clip, Adjustable Waist Band Strap, Carry Bag Used by Teachers, Coaches, Tour Guides, Presentations, US Army - Frequency Response: 100hz +/- 13db1khz +/- 1db - Rechargeable 7.4 Volt Lithium Battery Built In Rechargeable Lithium Batteries That Last Up To 12 Hours Of Continuous Use Before Needing A Charge - Current Consumption: 150ma