Kensington Mini Battery Extender and Charger for iPod; iPhone 1G, 3G (Black) Compatibility: iPod nano 1G, 2G, 3G; iPod classic 4G, 5G, 5.5G, 6G; iPod touch; iPhone 1G, 3G, 4 Power and charge your iPhone or iPod--extends playtime up to 30 hours of music or 6 hours of video (on iPod nano 3G) or 3 hours of talk (on iPhone) Includes retractable USB charging cable High-capacity rechargeable lithium-ion polymer battery pack for increased energy efficiency Small enough to keep connected to your iPhone or iPod