The Rocktron Tsunami Chorus Pedal enables you to get the much sought-after warmth and richness of vintage favorites. A dual switch setup features depth, rate, and delay for chorus while an exclusive ambience control allows 0-30ms of carefully contoured room delay for a huge stereo spread or "doubled" sound. The Tsunami has a heavy-duty extruded-metal chassis that features countersunk controls and sturdy switches. Powered by a 9V battery or optional AC adapter.