SIIG HD Digital 7.1 USB Audio Box: * Compatible with latest USB audio device class 2.0/1.0 (UAC 2.0) * Full HD (24bit/192KHz) multimedia 7.1-channel USB audio box * Embedded independent audio processor * Full HD audio output with 108dB SNR * Front RCA stereo outputs * Standalone line-in, mic-in and headphone-out * Optical input and output for PCM data * Big wheel for volume control and push to mute * Bundled Xear3D for better UI and virtual surround sound technology