Specifications: It supports 32KBz, 44.1KHz (which two need driver or application software support) and 48KHz sampling rate in digital recording, 48KHz sampling in analog recording and 48KHz in digital/analog audio playback. In digital playback mode, it receives audio stream from PC through USB interface and transmits audio data according to the AES/EBU, IEC60958, S/PDIF consumer interface standards. Only R, L channel PCM audio in 5.1 channel can be conveyed in digital playback mode. In analog playback mode ,it supports 6 channels codec for analog playback. Fully duplex playback/recording audio stream without sound card in PC. Supports conventional audio 2 channels source playback. Mic in= microphone input: plug in the microphone. Line in= line input: Input audio such as MP3 to the sound card, synthesize and edit on the computer. Front out= front output: 2-channel plug-in headphones or speakers / 4 channels or more plug-in front speakers. Rear out= rear output: turn on 4 channels or more to sound / plug the rear speakers. Cen/bass out= center/bass output: 5.1 speaker dedicated interface. SPDIF IN= fiber input: Fiber audio input to the sound card, synthesized editing in the computer. SPDIF OUT= fiber output: General output to a fiber amplifier or decoder (digital signal). Type: USB Sound Card Material: ABS Features: 5.1 Sound, 6 Channel, Portable, Plug and amp; Play Size: Length: 89mm/3.50 and quot;, Width: 69mm/2.72 and quot;, Height: 21mm/0.83 and quot; (Approx.) Notes: Due to the light and screen setting difference, the color of item may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 x USB Sound Card 1 x Optical Drive 1 x Cable 5.1 Sound, 6 Channel, Portable, Plug and Play ABS USB Sound Card 5.1 Sound, 6 Channel, Portable, Plug and Play ABS