4 x USB Output: 5V 0.5A ~ 2.1A, Charging Four Devices simultaneously, design for charging Phones and Tablets, Can charge 2 Tablets or 3 Smart Phones simultaneously at most * High Capacity:12000mAh , Supply about 600%~700% of iPhone 4 battery life, or 200%~250% of Google Nexus 7 battery life, 4 Integrated LED indicator show Power status * Battery Type: Li-polymer battery; more stable and safer than Li-ion battery, such as both iPad and iPhone use the safer Li-polymer battery. 500+ recharge cycles over the life of the battery * Security protection design: short-circuit and over current protection; The device will automatic shutdown when short circuit or overload output happened to avoid destroy the device and accident * Stylish & portable design; Ergonomic design for easy handle by one hand; Perfect for long plane flights, road trips; Carry the mobile power wherever you go; charge your devices any time any where