Easily the 3.5 headphone to digital audio/amplifier Double noise reduction, no current sound, stronger anti-interference -in professional audio op-amp chip to high-quality sound quality transportation Optical fiber and co-frequency audio shaft output at the time No driver required, plug and play Converts RCA or AUX analog stereo audio signal to Digital Coaxial audio and Toslink Spdif Optical digital audio simultaneously. Note: It's not a Digital to Analog audio converter. color:Black Material:Metal Package Contents: 1 x converter 1 x optical cable 1 x USB cable Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.