Fast Charging Technology: 2.1 Amps output max, supports you charge 3.5 times for iPhone and twice faster than normal 1.0A input backup charger,saving your time. Portable Mini size (1.2*5.5*1.6 inches) but high capacity 8000mAh, easy to taking for working, traveling, flights, business trips or any time you’re away from an outlet. Intelligent Safety Protection – Supports over-charged, over-discharged, over-voltage, over-current and short circuit protection and will automatic shutdown if a short circuit or overload output occurred while unit is charging. Compatible for: 8000mAh portable charger with 2.1A output provides high speed charging for Apple, iPhone, iPad, Samsung Galaxy, Google Nexus or other tablet and smart phone. 100% customer satisfaction, 30 days worry-free money back with One Year limited warranty.