EMP Professional EBK27 900W HI-FI Stereo Amplifier 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 150W+R150W | Mic input sensitivity10mV External device sensitivity:200mV,4:S/N ratio80dB | T.H.D:0.1% | Frequency band:25Hz~20KHz | Mic.tone adjustmentLOW:80Hz15dB Mic.tone adjustmentMID:3.5KHz12dB | Mic.tone adjustmentHI:12KHz15dB | Echo.tone adjustmentLOW:80Hz15dB | Echo.tone adjustmentHI:12KHz15dB Music.tone adjustmentLOW:100Hz15dB | Music.tone adjustmentMID:1KHz12dB | Music.tone adjustmentHI:10KHz15dB | Power source:100V/60Hz