External Power & Back-up battery functions:
On the condition of Iphone no power, inserting Iphone into our charged Iphone power station, then Iphone is being charged at once.
Now you can use your Iphone normally.
Usually, it will need about 3 hours to charge Iphone full.
In this way, you can save a lot of troubles bringed by Iphone's Non-withdrawable battery.
Charger function:
Also, it can be used as a charger, you can charge this power station and Iphone synchronous when they are connected;
or you can only charge Power station when there is no Iphone connected.