"5 Mic & 2 Aux Inputs. Built-in MP3 player with remote control for USB, SD/MMC card reader. Preamplifier and Line Output for connecting to a Booster Amplifier and for recording the programme. Line Input for connecting the output from any external mixer or permitting KTA-248U to be used as a Booster Power Amplifier. Resettable circuit breaker for protection against overload and short circuit. Instant transfer to DC power (Car Battery) if AC power fails. Box Speaker/Driver Unit selector switch. Bass boost defeated at Driver Unit position for safer operation of driver units." Model No KTA-248U Power Output 250W Max., 190W RMS at 10% THD, 170W RMS at 5% THD, 150W RMS at 2% THD Output Regulation ? 2 dB, no load to full load at 1kHz Input Channels 5 ? Mic 0.65mV/4.7k?, 2 ? Aux 100mV/470 k?, 1 ? Line 1V/50k? Frequency Response 50-15,000Hz ?3dB Signal to Noise Ratio 60dB Tone Controls Bass: ?10dB at 100Hz, Treble: ?10dB at 10kHz Output Preamp 200mV/600?, Line 1V/1k? Speaker Output 2?, 4?, 8?, 70V & 100V Digital Player FM Player, MP3 Player with USB reader Power Supply AC: 220-240V 50/60Hz?DC: 24V (2?12V Car Battery) Power Consumption AC: 460VA?DC: 6A Dimensions W450 ? H160 ? D340 mm Weight 13.0kg