Foxrox Electronics AquaVibeAquaVibe runs on 9 Volts DC (external). Power input is protected and filtered and is internally converted to 24 Volts DC. Speed of effect can be controlled with a standard Expression pedal and no special wiring is needed. Includes Center control for altering the balance of the sweep. We'll skip all the hype about Hendrix, Trower, lush vibe swirlling "Machine Gun" psychedelic Uni Vibe sounds. Let's just say, it's all in there and much more. IN OUT