This is an early, large-enclosure (Big Box) "Holy Grail" made in the USA, also known for being used by John Frusciante. It features a deep, analog-like, warm reverb that is not found in current models. With just this one unit, you can create a unique atmosphere, from spring reverb to "Flerb" sounds. Although it has only one knob, it is well-tuned and can be operated intuitively. ●Condition • Operation: All modes (Spring/Hall/Flerb) operate normally. • Appearance: There are scratches and minor imperfections commensurate with age, but there is no major damage, and it is in good condition as a vintage item. Please judge from the photos. • Power: Batteries cannot be used, so we recommend using an adapter. ●Contents • Main unit only For guitarists who will cherish it, please consider purchasing. #ElectroHarmonix #EHX #HolyGrail #JohnFrusciante #Reverb #EffectsPedal #MadeInUSA