RCA output DAC with optical digital and coaxial inputs. - Model Name: TAISHAN - Input Terminals: Optical digital, coaxial - Output Terminals: RCA output - Power Supply: DC 5V - Switch: Coaxial/Optical switch After purchase, it was used only briefly and then stored away after upgrading to a larger DAC. Regarding sound quality, there are many positive reviews. It's well-regarded for having no noise and no perceived degradation or delay in sound quality. It's also praised for its price, with users feeling it offers good cost performance. In terms of design, some opinions suggest it doesn't look cheap. Please refer to the Amazon page for more details. https://amzn.asia/d/f01xHzT Everything included is shown in the fourth photo. This is a used item. Please understand that it is a used item before purchasing. Thank you for looking.