Estone USB 2.0 3D Virtual 7.1 Channel Audio Sound Card Adapter for PC Laptop WIN 7 MAC The USB 2.1Channel (Virtual 7.1) sound adapter is a highly flexible audio interface which can be used either with Desktop or Notebook systems. Bundled with Xear 3D sound simulation software, it turns your stereo speaker or earphones into 2.1 channel environment (Virtual 7.1 effect). No drivers required, just plug and play for instant audio playback, also compatible with all major operation systems. Compliant with USB 2.0 Full-Speed (12Mbps) Compliant with USB Audio Device class Specification 1.0 Compliant with USB HID Class Specification 1.1 USB bus-powered mode, no external power required