"4 Mic & 1 Aux Input. Built-in MP3 player with USB reader and remote control. Line Output for connecting to a Booster Amplifier. Active Bass & Treble controls. Instant transfer to DC Power (Car Battery) if AC power fails." Model N0 KTA-85U Power Output 100W Max., 75W RMS at 10% THD, 70W RMS at 5% THD Output Regulation ? 2 dB, no load to full load at 1kHz Input Channels 4 ? Mic. 0.6mV/4.7k?, 1 ? Aux 100mV/330k? Frequency Response 50-15,000Hz ?3dB Signal to Noise Ratio 60dB Tone Controls Bass: -10dB +7dB at 100Hz, Treble: -10dB +7dB at 10kHz Output Line: 1V/3.5k? Speaker Output 4?, 8?, 16? & 100V Digital Player FM Player, MP3 Player with USB reader Power Supply AC: 220-240V 50/60Hz, DC: 12-14V Car Battery Power Consumption AC: 140VA?DC: 3A Dimensions W385 ? H130 ? D310 mm Weight 9.6kg