SMO MUSE Mini 24Bit 192Khz Coaxial Optical USB Input DAC Headphone Out Black ELNA/NICHICON/ NIPPON-CHEMI and EVOX audiophile grade capacitors. 1.6mm thickness FR-4 fiber-glass PCB board. Sliver coated RCA/coaxial terminals. When using USB input,The coaxial connector can output SFDIF signal for the other devices.