The HD digital 7.1 USB audio box is a versatile tool to add true 7.1 high-definition audio quality to desktop or notebook computer via a USB port. It supports 24-bit/192kHz full HD audio for both playback and recording, features RCA stereo outputs with rear surround, side surround, center and subwoofer outputs for easy multi-channel speakers hookup and comes with optical SPDIF input and output to expand your audio capability. This portable HD 7.1 USB audio box is integrated with a rotary wheel designed for smooth volume control. It is the easiest way to enhance onboard audio performance, bringing amazing surround sound quality for better music, movie and gaming experiences from your system.