AKAI professional APC20 ABLETON CONTROLLER I used it a few times in the year I bought it, and it worked fine. After that, I stored it at home. Currently, the operation is unconfirmed. There are no noticeable scratches on the main unit. The box has discoloration and stains due to deterioration. Please understand that this is a used item before purchasing. The AKAI APC20 controller is optimized for Ableton Live. - Model Name: APC20 - Brand: AKAI - Compatibility: Ableton Live - Connection Type: USB - Power Type: AC Adapter Thank you for viewing.