POWERADD Pilot 2G 8200mAh Portable Charger External Battery Power Pack for iPhone, iPad, Samsung Galaxy Note and other 5V USB-Charged Devices - Silver (Apple Adapters Not Included) High efficiency rate, charges an iPhone 3 and a half times, or other large capacity smart phone like Galaxy S4 2 times. 2.1A output charges your devices more rapidly. Aluminum body design to ensure lightweight and durability. Compact size makes it easy to carry and fits easily into pocket. Unique HIGH INPUT design, use a 2.1A adapter for fastest charging time, twice faster than general 1A input. Constructed with Li-Polymer battery cell and build-in microchips, to ensure safety worry-free use and long lifespan. LEDs display is easy to know how much juice you've got left. Package contents: Poweradd&trade; Pilot 2G external battery, micro USB cable, user manual.