The USB DAC Audio Converter with analog output, coaxial / optical digital output, headphone output, you can output to the headphones, directly as a USB sound card to use. USB audio sound card adapter is a highly flexible audio interface, which can be used with either laptop or desktop system. No driver required, plug-and-play for instant audio playing and compliant with all mainstream operation systems. Simply plug the sound adapter into your USB port, and then plug your headphones into the adapter. Features no external power required.