This product was purchased from Ongaku no Tomo Sha's online shop. The items for sale are the amplifier itself, a USB audio adapter that was connected to a computer, and a 50cm cable for connecting to the amplifier (as shown in the photos). The AC adapter is not included due to a disconnection issue, so please prepare one yourself. This is a used, working product and has not been modified. For packaging reasons, the amplifier's four feet will be detached and included in the shipment.