From MXR:

“The Blue Box Octave Fuzz drops your guitar signal two octaves down and combines it with gnarly fuzz for huge subterranean tones. This pedal can be powered by a 9-volt battery, a Dunlop ECB003 9-volt adapter, or the DC Brick, Iso-Brick, and Mini Iso-Brick power supplies (not included).”

Brand new with box.