Podium Pro Audio PP1506A1 Battery Powered 15-Inch 900 Watts Active Speaker with USB SD MP3 Player 15'' Woofer - Power Output: 450 Watts RMS, 900 Watts Max - Sensitivity is 107dB - Frequency Response is 25-20,000 Hz Built In MP3 Player with USB Drive or SD Card Inputs, Remote Control and Several Control Options Class D Amplifier - Rechargeable Built In Battery - Charging time approximately 6 hours - Charge lasts for approximately 4 hours Two 1/4" Jack Inputs & Volume Controls for Microphones - 1/4" Line Input and Control - RCA Inputs & Volume Control for an Additional Component - 1/4" Jack Line Level Output for an Additional Powered Speaker Master volume control, Bass, Treble, Echo and Delay Control Knobs - Pole mount with knob adjustment for different size stands - Side Handle, Top Handle and Wheels for easy Portability - Height 27.5" x Width 19" x Depth 15" - Weight 61 pounds