The Dock saves your valuable desk space with an easy install right into it, through a 3-inch circular hole. You can now seamlessly charge and play your iPod as you sync it to your computer. A stereo-output jack on the Dock lets you listen to your music through your stereo, powered speakers, or headphones. Note: Requires a 3-inch opening in your desktop or other surface. If your desk does not have a pre-drilled hole in it, you can drill one yourself using a 3-inch hole saw (requires separate purchase, not from Belkin).