The ICUSBAUDIOMH External USB (Universal Serial Bus) Card lets you add an S/PDIF digital audio output or a standard 3.5mm analog audio connection to your system through USB (Universal Serial Bus). By converting a single USB (Universal Serial Bus) port into an external sound card with microphone connectivity, you can conveniently bypass or replace an internal sound card without having to open your computer case. The USB (Universal Serial Bus) DAC (digital-to-analog converter) provides a built-in microphone, allowing you to add audio recording capability to your system without the need for additional hardware. This integrated microphone can also be placed further away from your computer's speakers, reducing or eliminating feedback that is often problematic with laptops that utilize an on-board microphone. For home-theater quality sound, the external sound card offers 96 K Hz / 24-bit sampling rates for both playback & recording, & a 3.5mm S/PDIF port with support for Dolby Digital 5.1 surround sound (AC3) & DTS pass-through (Note: 5.1 surround sound is supported in Windows only). By implementing 3.5mm stereo microphone connection the USB (Universal Serial Bus) audio adapter equips you with the ability to attach an external stereo microphone as needed. For added versatility this USB (Universal Serial Bus)-powered sound adapter features a 15in attached USB (Universal Serial Bus) cable, volume control, mute, & microphone mute buttons for quick adjustments, a 3.5mm stereo microphone input, & a convenient LED status bar to display the current sampling rate. Backed by a Star Tech.com 2-year warranty & free lifetime technical support. The Star Tech.com Advantage Offers more flexible microphone placement options than an on-board audio adapter, helping to eliminate audio feedback Save time & hassle by adding audio capability without having to open your computer case