This device recharges an iPhone even when travel extends beyond the reach of electrical power. The unit's integrated battery restores a full charge to an iPhone in only 1 1/2 hours and holds enough power for two charges before requiring recharging itself. Allowing cables to be left at home and two iPhones to be charged simultaneously, the charger employs docking cases that begin charging an iPhone when set on its base and automatically shut off when the iPhone(s) are charged. It also has a mini-USB jack that permits use with many other cell phones. The device's Li-ion battery recharges overnight when plugged into a computer via USB or into a 5-volt auto DC outlet with the included dual cable. LEDs indicate the unit's battery level. Only slightly larger than an iPhone itself, the charger won't occupy excessive luggage space. Includes two charging cases. Compatible with iPhone 4 only. 3/4" H x 4 1/2" W x 6 1/4" L. (5 1/2 oz.)