StarTech USB Stereo Audio Adapter External Sound Card with SPDIF Digital Audio The ICUSBAUDIO2D External USB Sound Card lets you add an S/PDIF digital audio output and standard 3.5mm analogue audio/microphone connections to your system through USB - a convenient way to bypass or replace an internal sound card without having to open the computer case. For home-theatre quality sound, the USB DAC (digital-to-analogue converter) offers 96KHz / 24-bit sampling rates for both playback and recording, and a 3.5mm S/PDIF port with support for Dolby Digital 5.1 surround sound (AC3) and DTS pass-through (Note: 5.1 surround sound is supported in Windows only). This versatile USB audio adapter features an integrated 3.5mm 4-position TRRS connection for your headphones or combination headset/microphone. Also a convenient external volume control for quick adjustments, a hardware EQ switch for Bass or Treble boosting, and an LED status bar to display the current sampling rate. Please note that the microphone input is stereo only.Please note this item is non-returnable, see our returns policy for more information.