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Backlight Time - This function is set the duration of backlight turn on. User can select from saving mode, 10 sec, 30 sec, 60 sec. It is recomended that backlight time set shortly for using long time. Contrast - This function is set the screen brightness degree, and user can set one of 10 level. Volume - This function is set the speaker volume, and user can set one of 10 level. (Also can set sound off)