This is an auction for the KORG Pitchblack (PB-01) tuner unit only. It was mounted on a pedalboard and connected to the tuner output of a switcher, and used constantly. I am selling it because I am dismantling the pedalboard. It can be powered by DC9V (center negative) / 9V battery, but I have never used a battery. I have confirmed that it is working properly before listing it. Also, there are some scratches and minor marks from use. Please check the appearance in the images. This is only a visual inspection by an amateur. I would like to ask that only those who understand used equipment purchase this item. Thank you for your consideration.