Easily connect 3.5 headphones to digital audio/amplifierDual noise reduction, no up-to-date sound, stronger anti-interference Built-in professional audio equipment op-amp chip for high-quality sound quality transportation Fiber optic and co-frequency audio output shaft at the same timeNo driver required, plug and play Converts analog stereo RCA or AUX audio signal into digital coaxial audio and Toslink Spdif digital optical audio at the same time. Note: This is not a digital to analog audio converter. Color: Black GreyMaterial: MetalPackage Contents:1 x Converter1 x Optical Cable1 x USB CableOnly the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.