This mini Power bank is 2800 mah, wireless, external and ultra thin. It is for charging iphones without electricity. It is very portable, easy to use and light weight. All you have to do is plug the power bank into your phone by sliding the power bank into the back of your phone. It sits flush with your phone so it is easy to use, not in the way and no wires to get in the way. Charges fast and it super easy to store. Very small and thin device.