7.1 SOUND CARD: This 1.7 USB sound card turns your laptop or desktop PC into a 7.1-channel home theater-ready sound system through a single USB 2.0 connection. COST-SAVING UPGRADE: With support for analog and digital audio output for stereo to 7.1 channel audio applications, the audio to USB adapter upgrade the existing integrated audio on a laptop or portable computer. BUILT-IN FEATURES: The external sound card features easy-to-use volume control and two external microphone inputs. It also supports 44.1KHz and 48KHz sampling rates for analog playback and recording or 48KHz for SPDIF. EASY INSTALLATION: The digital audio adapter is easy to install with plug and play support in Windows XP and Windows Vista operating systems. RELIABLE SUPPORT: Backed by a 2-year StarTech.com warranty, this 7.1 USB sound card also comes with free lifetime technical support.