USB audio adapter - easily add sound to any notebook or desktop computer; Virtual 7.1 channel surround sound provides home-theater quality surround sound via headphones or stereo speakers; Built-in amplifier for rich and powerful sound; Reduces unwanted static and noise from D/A processing; Places speakers to preferred positions without physically moving actual speakers via Speaker Shifter utility; Xear software offers 27 environment effects and 3 environment sizes, plus a 10-band preset equalizer; Plug & Play compatible; No power adapter required, obtains power from the USB port.