Simple and easy installation for any Electric Bass guitar.  Features Bass, Treble, Balance and Volume knobs on-board with Battery hole in center. High Impedance Input design can match with any Active or Passive Pickups and also Low Impedance Output will keep the same tone from your guitar to any amplifier system without losing high frequency response. Installation is a piece of cake! Semi-fixed potentiometer can increase BE2's flexibility for the precise aperture requirement. Each band has up to 12 dB of cut and boost. Bass : +/-12 dB at 100 Hz Current : 0.16 mA  Voltage range : 6 V ~ 22 V Treble : +/-12 dB at 4 kHz Battery : 9 V Alkaline (Not included)