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2. Interface Definition
GSM signal strength is indicated on the upper left corner of the main
interface as showed in picture 2:
Bottom left button is for interface switch as showed in picture 3:
III. Charge the Battery
Please use up the battery and discharge it for 2-3 times and then
charge the battery for at least 12 hours for initial use, in order to keep
the quality of the battery.
The normal charging time of this product is 4-5 hours.