FX-AUDIO- D302J++ [Black] High-Resolution Compatible Digital-to-Analog Amplifier with 4 Input Systems: USB, Optical, Coaxial Digital, Supports up to 24bit 192kHz Brand: FX-AUDIO- Maximum Supply Voltage: 12 Volts (DC) Minimum Power Supply Voltage: 12 Volts (DC) Number of Pins: 19 Interface Type: USB Manufacturer: North Flat Japan AC Adapter Required (Sold Separately): DC12V/2A or more, DC Jack 5.5mm x 2.1mm (Center Plus) Sound quality comparable to high-end amplifiers Full digital amplifier USB input supports high-resolution 24bit/192kHz thanks to the SA9123L Equipped with 3 digital inputs (high-resolution compatible) + 1 analog RCA input High-quality electronic volume and tone control functions Nichicon KT series audio capacitors used for power decoupling capacitors Used for 1 month. I was using it connected to an Apple TV via optical cable, but I am selling it because I purchased an amplifier with AirPlay. This product does not include an adapter, so I will include an adapter as a bonus.