What do the tones of renowned guitarist such as Page, EVH and Johnson have in common? They all used the legendary echo machine EP-3 as a pre-amp. We've captured that magic in a new Xotic Effects pedal, the EP Booster. We've used the highest quality parts available with a discrete FET design and low impedance output, the EP Booster provides up to +20dB of unadulterated boost with multi-dimensional, shimmering highs and lows, and no ear fatigue. The internal DIP switches let you choose the boost frequencies, and EQ settings. A simple pure boost that pays reverence to the magical EP-3 and captures the celebrated tones of the world's most famous players. The EP-Booster,great tone starts here! True bypass for eliminating any signal interference when switched off. Can be used with AC adaptor (optional) or 9V Battery.