Thank you for viewing. This item was purchased as a junk item from a certain recycle shop. There are repair marks on the circuit board, and the electrolytic capacitors have been replaced and the circuit board pattern has been repaired. It doesn't seem to be done by a professional, but on the other hand, it doesn't seem to be the work of an amateur either (see the last photo). Since there were no problems with the operation as an effector, I have been using it in my home practice effect system. I didn't feel any particular problems and was able to use it normally (although I hesitated to use it in live performances, etc.). Upon listing, I reconfirmed the operation, and it works with both an external power supply and a 9V battery, and the three knobs seem to work fine. As I don't believe it's a genuine repair, this item is sold as is and as junk. Please purchase after agreeing to no returns or refunds. Instant purchase is also OK, but by purchasing, you agree to this point. I will ship it as soon as possible on the day of purchase, or at the latest, the next day. Thank you.