Feature:1. External USB 7.1 surround sound adapter. Turn your PC into a 7.1-channel home theater-ready sound system with a 3.5mm mini jack.2. The 7.1 surround sound adapter is suitable for 3.5 mm output connectors for front, surround, rear, center/bass.3. Possess practical functions. Dual microphone input/builtin volume control button/full duplex playback.4. Optical S/PDIF input (pass through) and output The SPDIF optical pass through port of the audio adapter supports twochannel audio.5. This sound card supports 44.1 and 48 KHz sampling rates or 48 KHz for analog playback.Specification:Item Type: SC01 Stereo External Sound CardModel: SC01Material: ABSColour: BlackFunction: Sound CardScope of Application: Computer, etc..Package List:1 x Sound Card1 x Cable1 x CD Drive1 x Manual