PylePro PAMP150 150-Watt Portable Amplifier Loudspeaker PA System with Built-In USB/SD Card Reader Output power: 150 watts 75 watts RMS - outputs: low-impedance speaker outputs (4-8 ohms) - dimensions: 6.81'' X 11.14'' X 7.87'' Two 1/4'' Inputs: 1 Mic and 1 Instrument/Aux - Frequency Response: 100Hz-20kHz (Mic), 30Hz-20kHz (Line) USB/SD Card Inputs For Digital Music Playback - THD @ 1kHz: &lt;1%