The USB SoundWave 7.1 Pro from SIIG is a high-quality USB sound card for Windows PCs. The card supports 7.1 surround sound via the included S/PDIF optical adapter. It also supports standard stereo output via the 1/8" (3.5mm) connection. A standard microphone input is also present. The card is an excellent choice for anyone who would like to add 7.1 digital audio output to a PC.