3 Reverb Modes : Room ,Spring, Shimmer;Full metal Shell,Very small and exquisite,True bypass * DC 9V Adapter power supply ;free 8 way cable * Room :Different sized true acoustics reverb ,from room to hall * Spring : Simulates a classic spring reverberation, vintage 60"s Surfing sound . * Shimmer : Add rich overtone into the reverb sound ,spacy smooth and shining ,very popular in Post Rock music .