SANOXY® UltraPower 1900 mAh Backup Battery Charger for iPhone 3G, 3GS, 4, 4G, iPod, and iPod touch - External, Portable, Rechargeable (Black)
Easy to use, light weight, and pretty outlook. It can be carried easily and charged conveniently by put into the original power socket of iPhone and iPod series IPHONE 3G 3GS directly. Long wearing: If the battery is full charged, it can provide the iPhone and iPod at least one cycle power.