RAVPower Portable Charger 13400mAh (2A Input, 4.5A Dual USB Output) Power Bank External Battery Pack with iSmart Technology for iPhone, iPad, Smartphones and Tablets (White) 4.5A Output: Highest output in the market, featuring a 4.5A total output capable of simultaneously charging 2 tablets, making it faster and more powerful than the rest. Exclusive iSmart Technology: Charge faster and smarter than others, automatically detects and delivers the optimal charging current for any connected device- ensuring the fastest and most efficient charge. Huge Capacity: 13400mAh charges an iPhone 6 or iPhone 6s almost 5 times, a Galaxy S6 over 3 times or an iPad Air once. Safely recharges with a 2 amp or higher output charger (most phone chargers have only 1 amp). Unique Design: Smooth, ebony varnish allows you to power up in style, while 4 status LEDs keep you informed of remaining capacity. Safety Protection: Ultra reliable A+ Lithium-Ion battery with over 500 battery charge cycles; Security protection design: short-circuit and over-current protection. This battery pack will automatic shutdown if a short circuit or overload output occurred while unit is charging.