This is a **USB-DAC/DDC converter (DA-DD)** made by REIYIN. It converts USB digital audio from a PC, etc., to optical digital, coaxial digital, and 3.5mm analog outputs. The size is approximately 6cm (vertical) x 6.5cm (horizontal) x 2cm (height), making it a very compact size. It has been used only a few times, so the condition is good. It is currently sold on Amazon for 2799 yen as of December 29, 2025. It will be shipped in its original box, which will then be placed in another box. 【Main Features】 ・Supports up to 192kHz / 24bit ・USB input supported ・Optical digital output ・Coaxial digital output ・3.5mm analog output ・Headphone connection possible ・Aluminum casing for noise reduction 【Example Uses】 ・PC → Amplifier/Speaker connection ・PC → DAC/DDC use ・For converting digital audio sources 【Items for Sale】 ・All items included at the time of purchase are included. Please refer to the photos. Main unit, USB C cable (C on both ends), USB A adapter (converts C to A), instruction manual, and a bag to put the main unit in.