1、USB DAC audio converter has analog output, coaxial/optical digital output, and earphone output, which can be output to earphone and used directly as USB sound card. 2、USB audio sound card adapter is a highly flexible audio interface that can be used with laptop or desktop systems. 3、No need for drivers, plug and play, and compatible for all major operating systems. 4、Just plug the sound adapter into the USB interface, and then plug the headphones into the adapter. 5、No external power supply required. Features:  USB DAC audio converter has analog output, coaxial/optical digital output, and earphone output, which can be output to earphone and used directly as USB sound card. USB audio sound card adapter is a highly flexible audio interface that can be used with laptop or desktop systems. No need for drivers, plug and play, and compatible for all major operating systems. Just plug the sound adapter into the USB interface, and then plug the headphones into the adapter. No external power supply required. Specification: Condition: 100% Brand New Input: USB Output: coaxial/optical/stereo System requirements: Windows 10 /Windows 8.1/8 /Windows 7 /Windows Vista /Windows XP /Mac OS X or higher /PS4/Windows2000 Distortion: THD + N: 0.006% (RL > 10 k Ω) Signal to noise ratio: ≥102db Dynamic range: ≥102db Frequency response: 16-bit 32k, 44.1k, 48k Headphone impedance/output power: 16 ohm / 281 mw 32 ohm / 222 mw 64 ohm / 144 mw 300 ohm / 38 mw Operating temperature: 0℃ to 70℃ Package List: 1 * Adapter 1 * USB Cable 1 * Manual Note:  If you want 5.1ch audio output, install the driver on your computer Connect the USB audio sound card to your USB interface.  The computer comes with an attached USB cable The operating system will automatically detect this new device Connect the speaker/earphone and microphone to the product