The USBAUDIO5CH USB Audio Adapter offers a simple way to add 5.1 channel sound to a computer without even having to open the case! Designed to provide maximum quality 5.1 Audio using a single USB port, the USB Audio Adapter does not require that a soundcard be installed or onboard the host computer, so you don't even have to open your computer case to get high quality, 5.1 audio. A very convenient addition to virtually any notebook or desktop computer, the USB Audio Adapter also provides microphone and line-in inputs, as well as easy to use volume control, to simplify customizing your 5.1 audio experience to suit your environment; designed with a very small form factor, USBAUDIO5CH requires minimal deskspace and is USB powered - so there's no need to find an electrical outlet nearby, or have multiple wires cluttering your desk/workspace. NOTE: When used with MAC OS, volume buttons are disabled and only two channel output is ...