Features: Support /,IEC60958,S/PDIF Support 5.1 channel,7.1 channel. Can be connected to 5.1 speakers Up to 48KHz sampling rate, support 32KHz/44KHz/48KHz digital recording function. Sound card optical output only supports 48KHz sample rate, so DTS-CD is 44KH need to be converted to listen to Support Win98/ME/2000/XP/VISTA/WIN7/WIN8/ OS9.1 ( can only use 2-channel) Full-duplex audio stream playback and recording without PC built-in sound card USB 2.0 is backward compatible with USB 1.1 Compatible with Audio Device Specification V1.0 Supports up to 12Mbps USB full-speed transfer specification color: gray material: metal Package Contents: 2 x audio converter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.