With SanDisk's Sansa Speaker Dock, you can share and listen to your MP3 player's music anywhere. Get high-performance sound quality from your Sansa e100 and m200 series MP3 players, most other available MP3 players, as well as through any device with a standard 3.5mm headphone jack, typical on most laptops and CD/DVD players with the included cable. The Sansa Speaker Dock comes with an AC adapter, and gets hours of continuous playback with four AA batteries (not included).