Infinie 10400mAh Power Bank, Portable Charger, External Battery for iPhone, iPad, Samsung Galaxy and More (Silver) 3.1A Output: Featuring a 3.1A total output capable of simultaneously charging 2 devices, making it faster and more powerful than usual power banks. Automatically detects and delivers the optimal charging current for any connected device- ensuring the fastest and most efficient charge. 4 Integrated LED Power status indicator, and Auto power-off with no energy lose when not in use. 9-Layer Security Protection: Over-charger and over-discharge protection, Incorrect charger protection, PTC (Protection For Cell), Temperature Resistance, Reset Mechanism, Short Circuit Protection, Output Overcurrent Protection, Output Overvoltage Protection, and Input Overvoltage Protection. Automatic Charging: Simply connect your device and it will charge straight away. No ON switch, no extra buttons, just simple convenience.