Full-duplex audio playback and recording without a built-in sound card on your PC. Supports 6-channel analog playback and SPDIF digital audio input. Compatible with EBU, IEC60958, S/PDIF, USB2.0 audio, and USB audio controller. Digital recording function with up to 48KHz sampling rate. Supports for Win98/XP/2000/Vista/Win7/8, USB2.0 6-channel 5.1 external sound card. Item Name: Sound Card Material: Aluminum Alloy Line Length: 11cm Input And Output Interface: Mic In= Microphone Input: Plug in The Microphone Line In= Line Input: Input Audio Such As Mp3 to The Sound Card, for Compositing And Editing on The Computer Front Out= Front Output: 2-channel Down Plug in Headphones or Speakers / 4-channel Above Plug Into Front Speakers Rear Out= Rear Output: Turn on More Than 4 Channels to Produce Sound/plug Rear Speakers Cen/bass Out= Center/bass Output: Dedicated Interface for 5.1 Speakers, (note: Center And Bass Are The Same 3.5 Interface, You Can Set The Priority of Center or Bass in The Main Setting Interface. The Default Output of This Hole Is Center Output, The Bass Will Appear Only When There Are Hot Scenes in The Movie, It Is Not That The Sound Card Has No Bass Output) Spdif In= Optical Input: Optical Audio Input to The Sound Card, Synthesized And Edited in The Computer Spdif Out=optical Output: Generally Output to Optical Power Amplifier or Decoder (digital Signal) Features: High Sensitivity, Stainless, Portable Size Details: L: 10cm/3.94", W: 3cm/1.18", H: 1cm/0.39" (Approx.) Notes: 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. Package Includes: 1 x Sound Card 1 x Disc