Polk Audio I-Sonic Entertainment System 2 Compatibility: iPod mini; iPod nano 1G, 2G, 3G, 4G, 5G; iPod classic 4G, 5G, 5.5G, 6G; iPod touch 1G, 2G; iPhone 1G, 3G, 3Gs Top mounted iPod dock hidden behind a sliding door with iPod charging while docked HD Radio receiver with iTunes tagging allows you to easily purchase songs you hear over the airwaves Four speakers with the exclusive Polk Audio I-Sonic technology for room-filling 360-degree stereo sound Composite and S-video iPod video outputs for enjoying your iPod video on a TV (no video for iPhone or iPod Touch)