Virtual 8.1 Channel: Multi-channel technology, strongly 8.1 channel dynamic sound. It turns your stereo speaker or earphones into 8.1 channel environment. USB Port: USB bus-powered mode ,no external power required. Compliant with USB 2.0 Full-speed specification. Function: Reduce the noise and the sound is deep, enjoy the 3D sound effect.A highly flexible audio interface which can be worked either with desktop or notebook systems. Plug-and-Play: NO drivers required,just plug and play for instant audio playback, also compatible with all major operation systems. Application: Headphone amplifier for computer enhance bass and high pitch. Suitable for Windows, for Linux, for Mac. Item type: External Sound Card Size(L x W x H): about 61 x 28 x 12.2 mm Input Interface: USB 2.0 Support System: For Windows XP/For Vista/7/8/10/For Mac OS/For LINUX Other Functions: Mute Switch, Volume Adjustment Support Channel: 7.1 channel Due to different product batches, the appearance may vary, which does not affect the use. Colour:As Shown Material:Plastic Package Contents: 1 x USB External Sound Card Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.