Record and play back digital and analog audio without a built in sound card. External USB sound card supports USB 6 channel 5.1 audio. Adds full duplex audio playback or recording to any PC. In digital playback mode, device receives audio from computer via USB interface and transmits audio data according to the AES or EBU, IEC60958, S or PDIF interface standards. USB audio controller supports 32 KHz, 44.1 KHz and 48 KHz sampling rate in digital recording, 48KHz sampling rate in analog recording, and 48KHz in digital or analog audio playback. Only R L channel PCM audio in 5.1 channel can be conveyed in digital playback mode. If you want the fiber output to support 5.1-channel output, you must have the following conditions: The sound source must be DTS 5.1 channels, such as 3D games, high clarity movies. If it is a general MP3 or general 2-channel video, you can only have 2-channel effect.   Type: USB Sound Card System Requirements: for Windows 10 or 8 or 7 or XP or 2000 or 98 or for Apple Mac OS 9.1 and for Mac OSX (For Mac version supports twi channel playback only.) Features: External Sound Card, USB 2.0, High Performance Dimension: 15cm x 3.5cm x 1.5cm or 5.91" x 1.38" x 0.59" (Approx.)   Notes: Due to the light and screen setting difference, the itemand 39 s color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.   Package Includes: 1 x USB 5.1 Audio Sound Card 1 x CD Driver 1 x USB Cable Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.