Macally PowerLink Emergency Battery Pack with 2 GB Pen Drive for iPod and iPhone (Black) Compatibility: iPod mini; iPod nano 1G, 2G, 3G, 4G; iPod classic 3G, 4G, 5G, 5.5G, 6G; iPod touch 1G, 2G; iPhone 1G, 3G 270mAh Lithium-Ion battery provides emergency power for your iPhone or iPod Works as a data sync cable between iPhone/iPod and computer 2 GB flash drive for file storage Battery level indicator lets you know how much power is left