MUSYSIC MU-PRE2H Professional Audio Sound Processor Preamp Pre-Amplifier Pre-Amp USB/SD/Bluetooth Player / Power on/off switch with LED indicator / Microphone input jack / Microphone level control / Bass/midrange/treble/loudness/balance controls Master volume control / High/low frequency filter / Input source selector Aux/MP3/FM Tuner/USB/SD/BT/Phono input RCA jacks / Tape monitor switch Tape monitor switch / Rack mount design / 110V - 220V switchable