VIRTUAL 7.1CH SRS USB AUD ADPT W/OP S/PDIF OUT ROHS SIIG's long-term business vision, comprehensive product line, effective marketing strategy and exceptional customer support have made SIIG the leading brand for computer add-on products. High-quality control standards are evident by one of the lowest defective return rates in the industry. PRODUCT FEATURES: USB audio adapter - easily add sound to any notebook or desktop computer; S/PDIF optical output provides true 7.1-ch sound; Virtual 7.1 channel surround sound provides home-theater quality surround sound via headphones or stereo speakers; Places speakers to preferred positions without moving actual speakers via Speaker Shifter; Reduces unwanted static and noises from D/A processing; Supports EAX 2.0, A3D 1.0, and Microsoft DirectSound 3D; Easily control your multimedia output by using the integrated volume-up, volume-down, Speaker mute and Microphone mute buttons.