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How to ensure water resistance of the device?
TCL 3189 has a water resistance rating of IP68. After the SIM card and SD card are inserted, the installation of three components will greatly affect the waterproofing effect.
a) Battery cover waterproof ring (Before installing the Furnished battery cover, make sure that the waterproof ring is flat and secured, and it is not easy to fall)

b) Screws of Furnished Battery Cover (Make sure the screws can no longer be screwed)

c) Waterproof silicone stopper (Make sure it is pressed tightly)