EP-5 is an Echoplex preamplifier equivalent. It is a buffer and boost. Left sweetens and center fattens up your signal. Settings left and center are great for thickening up cleans and fattening up dirt. Setting right has a lot more gain and is great for solos or that cranked preamp sound.
Uses standard 9V to 12V center negative power. An internal charge pump will double it to 18V to 24V. No battery clip. Isolated power is recommended.