HyperJuice Plug Dual USB External Battery for iPhone, iPad, iPod and Android Devices - 18,000mAh, Jewel Silver 18,000mAh lithium ion battery (Jewel) 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, 3rd and 4th generation) battery life by up to 23 extra hours