Digital integrated amplifier, USB input compatible, with tone adjustment function. - Model: YD-202J - Input terminals: LINE-IN1, LINE-IN2, USB - Output terminals: SPK OUT - Functions: Volume adjustment, tone adjustment, mute function - Power supply: DC 12V 2A or more Box and power supply are not included. Only the main unit, remote control, and instruction manual (copy) are included. Purchased used and used until about six months ago. It was working before storage, but it cannot be confirmed to be working now due to the lack of a power supply, so it will be treated as junk.