B-Stock, Fredenstein Artistic Mic Preamp, 1-Channel Mic-Preamp 500 Module, OPA2 discrete audio operational amplifier, Hi-Z Instrument Input, switchable Impedance 1500 Ohms - 300 Ohms, +48V Phantom Power switchable, -20dB Pad, Gain Switch 15dB up to 65 dB, LED Meter, POL-Switch, Power consumption: +/- 16V, +/- 50mA, Dimensions: 500 Module, B-Stock with full warranty, may have slight traces of use