Kensington sd100 Notebook Docking Station K33419US Connect your notebook to your peripherals with just one USB plug 10/100 Ethernet port allows you to maintain an Internet connection and avoid wireless hang ups Stereo Out port allows connection of stereo or 2.1 speaker systems Connect your Internet chat headset with the Microphone In port and Stereo Out port Attaches easily to the Kensington SmartFit notebook stand (sold separately)