<p>Features: Easily connect the 3.5mm headphone jack to digital audio/amplifier board Built-in professional op-amp chip to ensure high-quality sound quality transportation Optical fiber and co-frequency shaft- output at the same time-;No driver required Double noise reduction, no current sound, stronger- anti-interference Converts RCA or AUX- analog stereo-- signal to Digital Coaxial and Toslink- Spdif- Optical digital simultaneously. Note: It is not a Digital to Analog converter. Specifications: Analog To Digital Converter RCA To Optical Digital Adapter Color:Black Gray as Shown Material:Metal System: forWindows7 Size: As Pictures Package Includes: 1PC x Converter 1PC x Optical Cable 1PC x USB Cable note: Due to the problems of lighting effects and angles, there will be certain tolerances in the product, please understand. Please allow 0-1cm error due to the manual measurment. </p>