SMAKN Mini DAC PCM2704 HIFI USB to S/PDIF Converter Decoder Black with USB Cable-BLACK Full-featured, with analog output, coaxial / optical digital output, headphone output plus output to the headphones Integrated with USB chip PCM2704 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 Use of safe and reliable USB B type port, to send high-quality USB cable, without power, plug and play