Casio DT-X100 Series Software Manual page 101

[Backlight]Tab
Tab
Backlight Auto display dimming when
using
Turn off backlight when using Specify "Enable" or "Disable" for backlight auto off,
Item
Specify the time period until dimming is enabled.
as well as a time period until the backlight turns off
when enabled, for both battery and AC power
situations.
101
[Version]Tab
Explanation