Easily connect 3.5 headphone jack to digital audio/amplifier Double noise reduction, no current sound, stronger anti-interference Built-in professional audio op amp chip to ensure high-quality sound transmission Optical fiber and same-frequency audio axis output simultaneously No driver required, plug and play Convert RCA or AUX analog stereo audio signals to digital coaxial audio and Toslink Spdif optical fiber digital audio at the same time. Note: It is not a digital to analog audio converter. Color: black gray Material: metal Package Contents: 1 x Converter 1 x Optical Fiber Cable 1 x USB Cable Only the above package contents, other products are not included. Note: Light and different monitors may cause the color of the item in the picture to be slightly different from the actual item. The measurement allowable error is +/- 1-3cm. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store