Built-in Bluetooth??  Built-in HI-FI stereo player?? Bulit-in FM with searching channel automatically.</br>Radio /MP3 / USB / SD player with Memory Functions.</br>Output power:500W??  Output mode:4-16?? 70V 110V??  Power source:100V/60Hz</br>Frequency response??60Hz-16KHz????2dB?? Input sensitivity??-50dB/600????Line??-10dB/10K??</br>Function included: Bluetooth / USB / SD / FM Radio / MP3 / WMA Player</br></br>Product Description</br></br>500W Public Address / Digital Karaoke Mixer HI-FI Stereo Amplifier w/ Remote / Bluetooth / USB / SD / FM Radio / MP3 / WMA Player</br><br/>http://www.amazon.com/gp/product/B01EZ426MG