Just Mobile Gum Backup Battery, Red

The Just Mobile Gum Thumb-Sized Backup Battery (Red) is an extremely small backup battery for smartphones and USB devices. The Lithium-ion battery has a capacity of 2200 mAh and can completely charge an iPhone. And when it comes time to recharge the Gum itself, simply recharge it via micro USB from your computer. The three green LEDs will show how much power is left.