Add an External Sound Card This external USB sound card lets you add an SPDIF digital audio output and standard 3.5mm analog stereo audio and microphone connection to your system through USB - a convenient way to bypass or replace an internal sound card without having to open the computer case. Great Sound Quality For home-theater quality sound, this external USB DAC (digital to analog converter) offers 96KHz / 24-bit sampling rates for both playback and recording, and a 3.5mm SPDIF 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). Versatile Functionality 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. This USB stereo audio adapter is ideal for several applications, including connecting your computer to a home theater audio receiver through SPDIF without opening the case, replacing or upgrading the integrated audio on your portable PC or laptop and adding digital audio support to an Ultrabook or small form factor system with no internal expansion options. This USB external sound card audio adapter is backed by a StarTech.com 2-year warranty and free lifetime technical support.