With the SoundWave 7.1 USB audio adapter you can 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.