Despite the fact that computers have become commonplace at home and at workplaces for a long time, true user friendliness of the computers is still a long shot. Zalman Tech strives to make that goal a closer reality through extensive research and development of its products and will continue to put efforts to creating more enhanced levels of user friendliness in computing.PRODUCT FEATURES:Small and compact;Easy-to-connect Plug-n-Play USB interface;This product supports both optical and coaxial types of digital outputs along with analog 5.1 channel outputs;3 Volume controls provide independent level adjustments for the Front, Rear, and Center/Subwoofer output channels;A built-in amplifier provides full sound and ease of use.