It's almost hard to believe how much is jammed into such a low-profile package. MicroPack's battery offers up to 80 hours of audio playback (varies by iPod model and settings). You can use the dock to power, recharge, and sync your iPod and as a stand for watching video. Willing to share some of that power? MicroPack sports two independent headphone jacks--each with its own volume control. Perfect for enjoying music or video on an airplane or train. We matched the brawn with brains in MicroPack's Lithium battery. This latest technology is smaller, lighter, and recharges more times than older Lithium-Ion batteries. MicroPack dock can power, recharge and sync your iPod and act as a viewing station for video.