SIIG CE-S00012-S2 USB SoundWave 7.1 Audio Adapter: * USB audio adapter - easily adds true 7.1 HD audio 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 noises from D/A processing * Places speakers to preferred positions without 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 needed, obtains power from the USB port * Supports EAX 2.0, A3D 1.0, and Microsoft DirectSound 3D * Dimensions: 2 1/2" x 1" x 5/16"