Traveling with a great little set of stereo speakers for your iPhone or iPod. This compact speaker system is easy to travel with. They need no batteries or power adapters. Plug your iPhone or iPod into the adjustable dock connector. That's it. The speakers get their power from the internal battery of your iPhone or iPod. But, if you want to charge your internal battery, or sync to your computer while you listen, plug the included mini-USB charge/sync cable into the Travel Speaker's pass-through connector.