stereo audio power amplifier karaoke system 2 channel output, Hi Fi stereo digital player USB/SD Card/ FM player,MP 3 Input DC 12V/5 Amp & input AC 220 V AC Mp 3 stereo ,HiFi Frequency 20 Hz-20 KHz Input sensitivity 0,25 mV -300 mW Output power RMS 50 wat Speaker impedance 8- 16 ohm SNR ( signal/Nois Ratio)-90dB I put impedance = 47K