This guitar pedal is designed to recreate the classic psychedelic rock sound of the original photocell Univibe effect. This is not a digital emulation—it is an analog effect with a true photocell inside. Sounds awesome. The pedal can be powered by a standard nine-volt, center-negative power supply (not included). The pedal has been used very gently, and is in nearly new condition cosmetically and works as intended. There are a few very light scratches in the pain on the bottom plate, visible in the listing photographs. Includes original box.