Palmer Pocket Amp MK2 Guitar Preamp, The completely redesigned Pocket Amp MK 2 offers an extended range of favored tube amp sounds from absolutely clean to extremely High Gain, Three-way switches for amplifier characteristics, gain mode and microphone position, Controls: Gain, Volume, Treble and Bass, ground lift switch, Connections: Instr. input, Headphones, XLR DI-out, jack output, Aux in, Die-cast aluminum housing, powered by a 9V battery or 9VDC power supply (not included, Item No. #108096)