ASUS Sound Card Xonar U5 True 5.1-channel HD (192kHz/24-bit) surround sound from a compact USB-powered device 104dB signal-to-analog ratio (SNR) ensures pure sound Sonic Studio provides complete control over loads of sound technologies Enjoy powerful audio quality from a compact and portable device Pumps up every sound Detail with the integrated headphone Amplifier Incredible input-noise reduction from Perfect Voice Independent mic and master-volume controls for instant in-game adjustments Integrated headphone amplifier provides clear, detailed sound for an immersive audio experience Dimension: 5.4 x 3.14 x 1 Inches ( L x W x H )