1、USB audio controller, support sampling rate of 32KBz, 44.1khz (driver or application support is required for the two) and 48KHZ in digital recording, 48KHZ in analog recording, and 48KHZ in digital/analog audio playback. 2、In digital playback mode, it receives audio streams from the PC via USB port and transmits audio data according to AES/EBU, IEC60958, SPDIF interface standards. 3、Only R and L channel PCM audio of 5.1 channel can be transmitted in digital playback. In analog play mode, it supports 6-channel codecs for analog play. 4、In digital recording mode, it receives SPDIF digital audio input and sends it back to PC via USB. 5、Adopt high quality material, sturdy and durable, long service life, stable performance. Item Type: Sound Card Condition: 100% brand new Color: Black Material: Aluminium alloy Size: Approx. 21x89x69mm/0.8x3.5x2.7in MIC IN: Connect microphone LINE IN: Input audio such as MP3 into the sound card for synthesizing and editing on the computer FRONT OUT: Insert headphone or speaker under 2-channel/insert front speaker over 4 channels REAR OUT: No sound below 4-channel/insert rear speaker CEN/BASS OUT: Dedicated interface for 5.1 speakers SPDIF IN: Input fiber audio to the sound card and edit in the computer SPDIF OUT: Generally output to optical fiber amplifier or decoder (digital signal). 1 x Sound Card 1 x Optical Disc 1 x USB Cable