The Polk MiDock portable sound system lets you enjoy your iPod music out loud, wherever you go! This lightweight unit folds flat, so it fits easily into your backpack or briefcase, and supports all iPod models (Shuffle and iPhone use Aux-in). Run on AC power when you're indoors, or enjoy up to 8 hours of playback on a single set of AA batteries. When connected to AC power, your iPod charges as long as it's docked, even when you're playing music. This minimal unit provides maximum sound output with its four metal cone micro drivers, and high-efficiency digital amplification system. Your podcasts and audiobooks come through crisp and clear, while your music sounds far richer than you'd imagine possible from a portable speaker system. The MiDock includes a padded case for safe travels, so you can take it anywhere, with no worries. MiDock offers all the power you'd expect from a Polk Audio stereo packed into a conveniently compact unit!.