Record & 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/recording to any PC. In digital playback mode, device receives audio from computer via USB interface and transmits audio data according to the AES/EBU, IEC60958, S/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/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 10/8/7/XP/2000/98 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/5.91" x 1.38" x 0.59" (Approx.)   Notes: Due to the light and screen setting difference, the item& 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.