KOCASO M6200 - Manual (Page 28)

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Picture 4.27
4. Video call ringtone
In Picture 4.25, click video call ringtone to choose video call ringtone, as Picture 4.28
Picture 4.28
(Note: Except standard, silent, meet, outdoor are only for selection, they can’t be set.)
4.7 Display
4.7-1 Adjust the screen brightness