High Capacity & Quality - premium cells create quality batteries. charge 2 batteries at the same time without any conflict because of the sufficient 5V / 2.1A input. Beneficial from the sufficient 5V / 2.1A input, rapid charge is available. No worry about missing awesome photos and videos. 2500mah high capacity bring you longer video recording and more photo shoot Convenient to use - ultra compact design, it's convenient to carry-on, making battery charging more flexible, you can recharge your battery wherever and whenever, Smart charging LCD indicates when charging is completed and prevents battery from overcharging, of course you can also check the charging process from the LCD display. Rapid Dual Charger - rapid charge 2 batteries simultaneously from any usb power source. built-in top quality A-Class lithium ion battery, safer to use. Multiple smart protection system keeps your devices safe from over-charging, over-voltage, over-current and short circuit