Portable Amplifier Specifications: Power Output : 50W RMS at 10% THD 85W RMS Max, Input Channels: Mic: 2 x Mic 0.6mV4.7k Aux: 1 x Aux 100mV470k, Line Output : Connecting to a Booster Amplifier, Freq. Resp.: 50-15,000 ± 3dB, Tone Controls: Bass: ± 10dB at 100Hz, Digital Player: DP Player with USB, SD, FM & MMC Card Reader with Remote Control.