TYLT Zumo Portable 1500mAh Battery with Built-In Apple 30 Pin Cable Cable - Black 1,500mAh battery provides up to 4 hours of extra talk time Easy to read LED lights indicate battery reserve with the press of a button Charges from any USB port Will retain its charge for up to a year 20-Foot cord Portable 30 Pin-USB charger Fits in Pocket Charge on the Go Fits in Pocket Charge on the Go