Mio MioMap v3.2 - Manual (Page 77)

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6.5.2 Brightness
You can set the backlight level separately for both daylight and night modes, thus
enhancing the effect of the night colour scheme. The values are between 0 and 10,
where zero means there is no backlight at all, and 10 represents the maximum
backlight value.
6.6 About screen
Tap About on the Main menu screen to open this screen. The About screen is not
used in normal navigation. It is there to inform you about the map licenses you have,
the creators of MioMap and the legal aspects of using the program.