High Sound Quality For home-theatre quality sound, this external USB DAC (digital to analog converter) offers 96 KHz / 24-bit sampling rates for both playback and recording and a 3.5 mm 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 3.5 mm four 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 theatre 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. Product is genuine original from manufacturer authorized distributors.