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Charge it with PC USB or AC adapter
Connect cable and micro USB connector, then insert power bank's input socket
Connect the other side of USB cable with PC USB port, or with adaoter with USB port, turn on PC or plug in the adapter.
When charging, 4 LEDs will blink follow the capacity. During charging, can quickly press the button to off LEDs. When 4 LEDs are keeping on not blink, it means power bank is full charged.
The charging time is related to the diameter of the USB cable.
2200mAh protable USB power bank for all kinds of phones