audio-technica AT-HDSL1 / Optical & Coaxial Digital Bi-directional Converter DDC [Valuable Bi-directional Conversion] audio-technica AT-HDSL1 Digital Audio Converter This is the digital signal converter (DDC) "AT-HDSL1" made by audio-technica. It is a very convenient device that can convert optical digital signals and coaxial digital signals bidirectionally. I am selling it because I was instructed to organize my belongings by my family. Bi-directional Conversion: It can convert not only "optical → coaxial" but also "coaxial → optical". Reliable Quality: Unlike inexpensive no-brand products, it offers stable signal transmission unique to a long-established domestic manufacturer. Compact Design: It doesn't take up much space and is useful for connecting devices with incompatible terminal standards, such as old AV amplifiers and the latest DACs. [Condition of the Product] Operation has been confirmed. Appearance: Scratches from use Included items: Main unit, AC adapter (※No box) [Recommended for those who] "Want to connect the optical output of a TV to an amplifier or DAC that only has coaxial input." "Want to connect the coaxial output of a CD player to a device that only has optical input." This is a very convenient device to have, as it is difficult to find a replacement. I will carefully pack and ship it. Thank you.