iSymphony R-SPKR1B Portable Amplified Speaker System with Built-in Universal Dock for iPod (Black) Compatibility: iPod mini; iPod nano 1G, 2G; iPod classic 4G, 5G; iPod touch Compact round stereo speaker with 50-watts peak and 10-watts RMS output power Built-in Universal Dock charges your iPod while it's docked Aluminum cone speakers and subwoofer with built-in high-quality amplifier Auxiliary input for any external audio player; powered by AC or 4 AAA batteries