Electro-Harmonix Holy Grail Plus Reverb Pedal BUNDLE With ZORRO Series DUNLOP Sample Pick Pack, Dunlop DEN 1046 Electric Nickel Medium Guitar Strings 10-46 & 2 Patch Cables (6") Controls: Blend, Amount, and Reverb Type (Hall, Room, Spring) 1/4" input and output DC power input for battery replacement.