Smart Technology- Automatically detects the devices and delivers the fastest possible charging current (up to 2.4A), ensuring the fastest and most efficient charge. High Capacity – Charges an iPhone 6 2.5 times or a Galaxy S6 1.5 times. Faster recharge – An input of 5V/2A means the power bank itself will be fully recharged 50% faster than other 6400mAh power banks. Ultra-Compact and Cool Design – Fitting in the palm of your hand or pocket, Bar size, round edge-cutting design offer you a wonderful power bank to hold or to take along. safety assured – High-quality LG lithium-ion battery cell and multiple quality tests passed guarantee its maximized safety and durability. Outstanding customer service provides 18 months warranty.