Fangrui Product Details Features: Support Aes/ebu,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/mac Os9.1 (mac 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 Fer Specification Color: Gray Material: Metal Package Contents: 1 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.