This is a used Electro-Harmonix Holy Grail Nano digital reverb pedal that features true bypass with a three-way switch for spring, hall, and flerb, which is a combination of flange and hall reverb effects. Lightly used with no visible wear, this Holy Grail requires a 9.6VDC power supply which is not included. This Holy Grail Nano is in very good condition and is fully functional.