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: Upgrade to digital 5.1 surround sound on low-profile desktop systems; High-definition 5.1 channel surround sound transforms your PC into a home theater system; Perfect audio upgrade for DVD playback, listening to MP3 or other music, gaming, and more!; Supports Dolby Digital/Dolby Digital EX surround sound, EAX 1.0, 2.0, A3D 1.0, and DirectSound3D; CD and Aux input (MPC3); Internal Digital output via 2-pin, Molex connector.