Altec Lansing inMotion iM3C Portable Audio System for iPod (White) Compatibility: iPod nano 1G; iPod mini; iPod 3G, 4G, 5G, 5.5G Highly efficient Class D amplifier delivers more than 24 hours of continuous playback with four AA batteries (not included) Revolutionary MaxxBass technology creates quality bass without a subwoofer Crystal-clear sound from four custom-designed neodymium 28 mm Micro Drivers Built-in Docking Station--provides same synchronization, data transfer, and recharging options as your iPod dock (cable not included)