HyperJuice Plug Dual USB External Battery/Charger/Extender for iPhone, iPad, iPod and Android Devices - 18,000mAh, 2 high power USB ports capable of charging 2 USB devices (even 2 iPads) at the same time Built-in retractable wall plug for easy recharging Extend iPad (1st & 2nd generation) battery life by up to 23 extra hours Extend iPad (3rd & 4th generation) battery life by up to 13 extra hours Built-in short circuit, overcharging and temperature protection