Features:1. size: approx. 57x25x12mm2. weight: 12g3. Led indicators: microphone mute status, activity4. USB 2.0 full speed ( 12Mbps) specification5. USB hidden classes specification 1.16. USB audio device classes specification 1.0. USB bus-powered, no external power supply required.7. This is an external 3.5-channel audio sound card adapter for USB 2.0. It can work with a desktop or laptop. And with the year 3d sound simulation software, extends your stereo speakers or headphones to a 5.1-channel environment, so that you can enjoy high-quality sound.8. connections: USB type A, stereo output jack, mono microphone input jack.9. year 3d virtual 7.1 channel sound simulation software for windows xp/vista is included10. functions buttons: microphone mute, speaker mute, volume up, and volume down.11. Plug-and-Play. No drivers are required for windows 2000/XP/server 2003/vista, Linux, and mac os.Package includes:1 x USB sound cardNote:This product comes without retail boxes, we put it in a safe package.