Bass RC Booster with a 2 band EQ, 15dB boost / cut function and a very smooth clean boost, this pedal meets a wide range of tonal applications. With signal loss and EQ limitations common to vintage basses. The Bass RC Booster serves as the perfect remedy. It is designed to enhance your bass guitar tone without masking it. It is true bypass for eliminating any signal interference when it is switched out and can be used with AC adaptor (optional) or 9V Battery