**********Full-featured, with analog output, coaxial / optical digital output, headphone output, you can output to the headphones, directly as a USB sound card to use. It is USB DAC, not USB audio. It only supports 2.0, not support 5.1 surround, AC3 and TV. *****Coaxial and fiber optic signal IC for high-speed data through the plastic, the output signal is more stable, pure*****Digital output signal isolation transformers fever DV709 digital filter, the other a more pure sound*****Compact, portable, includes input and output sockets*****With fever world acclaimed USB chip PCM2704