ASUS Xonar U7 Sound Card True 7.1-Channel, 192Khz/24-Bit High Definition Sound From A Compact Usb-Powered Device Dedicated Mic Volume Control For Instant Adjustments Right In The Heat Of Gaming Action Integrated Headphone Amplifier Pumps Up Every Sound Detail True 7.1-channel, 192kHz/24-bit high definition sound from a compact USB-powered device Dedicated mic volume control for instant adjustments right in the heat of gaming action Integrated headphone amplifier pumps up every sound detail 114dB signal-to-analog ratio (SNR) ensures pure sound. Dolby Home Theater v4 delivers lively surround Refer Instruction/ User Manual under Technical Specification