Effect pedal, Booster. Creates a warm and pleasant sound by using the finest quality parts available. The super wide range gain control allows for enough gain for it to work as a distorion pedal when turned all the way up. Equipped with not only boost Gain but also Treble and Bass controls that allow you to adjust your sound anyway you like. True bypass for eliminating any signal interference when switched off. Can be used with AC adaptor (optional) or 9V Battery.