Used- scratches and scuffs as seen in the pictures but tested and sounds fine. Does not come with a power supply. It can be battery operated. The CS-3 Compression Sustainer Pedal compresses louder signals while boosting lower signals, providing smooth sustain without degrading the original sound quality. This is the perfect pedal for guitarists and bassists who want to sound their best. Compact compression/sustainer pedal with high-quality circuitry Compresses loud signals and boosts softer signals for a smooth overall sound Onboard Level, Tone, Attack and Sustain controls for precise tonal shaping Low-noise design for super-quiet operation