EMP Professional EBK7 400W HI-FI Stereo Amplifier with Remote/Bluetooth/USB/SD/FM Radio/MP3/WMA Player Built-in Bluetooth. | Built-in HI-FI stereo player | Bulit-in FM with searching channel automatically. | Radio /MP3 / USB / SD player with Memory Functions. Output power(4:L 10W+R10W - Power source:100V/60Hz Frequency response:40Hz-20Hz(2dB) T.H.D:0.19% 4S/N ratio:80dB Input sensitivity200mV 6:Trebel control:15dB(10KHz) 7:Bass control:15dB(100KHz)