FIIO K7! Available for immediate purchase! No noticeable scratches, and no issues with operation. All accessories are included: AC adapter Power cable USB Type A to B cable 6.3mm to 3.5mm adapter Quick start guide Warranty card Equipped with a dual configuration using the latest AKM DAC chip "AK4493SEQ," one for each of the left and right channels. The audio circuit adopts a fully balanced design, the same as the top-of-the-line K9 Pro ESS. This model supports balanced headphone connections, which many users requested. Please check the manufacturer's website for details. https://www.fiio.jp/products/k7/ High-quality DAC with various connection terminals, ideal for improving sound quality. - Model name: K7 - Connection terminals: USB, Optical Digital, RCA, LINE IN - Volume knob: Yes - Input selection switch: Yes - Genuine Japanese domestic product: Yes