No operational issues. Please read the following important notes carefully and purchase only if you agree. Important Notes: The pilot lamp LED is missing. Therefore, visual confirmation of ON/OFF status is not possible. The circuit board for attaching the LED remains, so those with expertise may be able to repair it by installing a separate LED. Due to the above notes, the price is lower than the market average. Operation confirmed. There are some scratches, but there are no problems with use. The OC-5 is, in my opinion, superior to other octave pedals. It has excellent chord tracking in poly mode, good sound quality for octave tones, and the ability to output the dry signal separately. I think it has wonderful features and performance. Please consider the above points before purchasing.