Our PlayDock MP3 features Cambridge SoundWorks' signature 3 speaker design that delivers all the musical goods, top to bottom. When using its AC adapter, the PlayDock MP3 will play music idefinitely. Plus, the PlayDock MP3 has an internal battery that turns out up to ten hours of fabulous, cordless music anywhere you go, inside or out. When it's plugged into the wall, the PlayDock MP3's long-life battery is recharged, as is the battery of Creative® and Dell® MP3 players - very cool. In fact, all the Creative NOMAD® Zen, Zen Touch and Zen Micro lines, Apple® iPod and Apple iPod Mini players, and the Dell DJ and Pocket DJ will dock and play through the PlayDock MP3 system.