The BB Preamp offers awide variety of sounds. It's capable of a 30dB+ clean boost with an adjustable ±15dB two band active EQ which adds a wide range of harmonic content to your ideal sound. The BB also utilizes a pre-gain stage which allows the Pedal to go from a very pristine clean to a very smooth,compressed, overdriven sound. True bypass for eliminating any signal interference when switched off. Can be used with optional 9VDC Negative Tips AC adaptor or 9V Battery. Power Consumption: 9VDC/6mA. Input Impedance: 500k ohm min. Output Impedance: 10k ohm.