Thank you for viewing. I obtained this item used for a small test. In preparation for listing, I checked the following: - Audio input and switching from coaxial digital and optical digital terminals - Output from the headphone jack (3.5mm) - Output from the RCA terminals Please note that this product is not a USB-DAC. The Micro USB terminal is for 5V power supply only, so it will not be recognized even if connected to a PC. During testing, I confirmed operation by connecting it to a USB self-powered hub for power supply. According to reviews on e-commerce sites, it seems that USB bus power may cause malfunctions depending on the environment. Although its function is a simple DA converter, it's a product that seems a bit geared towards enthusiasts. I recommend it to those with a certain level of knowledge. There are no accessories, only the main unit. Instant purchase is OK. It will be shipped via Yu-Packet Post. Thank you.