Audio Advantage Micro USB Sound Card Easy replacement for any sound card on any computer with a USB port. On computers with older sound cards, you can have a richer and fuller sound experience with it's built in amplifier. Dolby Pro Logic, Dolby Headphone and 5.1 Virtual Xear multi-speaker simulators for creating 3D surround effects. Audio out options include the ability to plug in a headphone, speakers, or an optical cable using the included SPIDF adapter. Wide variety of digital ambiance settings for simulating many different effects. Listen to DVD audio with spectacular simulated home-theater surround-sound on stereo headphones. Multi-band equalizer with user-defined presets for adjusting tone, included on the Audio Advantage Micro CD that ships with the unit. Powered by the USB bus - no external power needed! About the size of a pack of gum. Works with all standard stereo headphones with a mini-jack