End your search for accessible outlets in public places. Let the Portable Power 5400 collect the power, then recharge your mobile device at your convenience, anywhere. With a 5400 mAh battery and a 2.1 amp output, the Portable Power 5400 quickly transfers power to your iPhone, iPad or any other compatible USB-chargeable device. A series of LED lights indicates the charge progress. Fully charged, the Portable Power 5400 provides enough capacity to recharge an iPhone twice. Once drained, simply plug the input into a USB port on your computer or a Usb compatible power adaptor.