I have confirmed that the operation is OK, and all control knobs are working. *Regarding the cross key circled in red in the fourth photo, only the right side sometimes feels like it has poor contact, but it responds when pressed while pushing it to the left. There are scratches and other signs of use on the surface, so please purchase if you understand that this is a used item. This is a set of three items: the main unit, the power adapter, and the SKB case. *As shown in the seventh photo, the zipper pull of the case is broken, so a strap has been attached. *Except for conditions such as no response or no sound, we will not accept any claims or returns. If you have any questions or desired prices, please feel free to comment! Thank you!