Holux V1.02 - Manual (Page 29)

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GPSmile52
Backlight Settings
The backlight settings will adjust the brightness of the backlight and the
auto-off time.
1. Under the settings window, select Backlight to enter the backlight
settings window.
2. Select the time to turn off backlight when running off the battery /
external power (1 min, 3 min, 5 min, 10 min, 30 min, Always On).
3. Scroll the brightness bar to control backlight brightness. There are six
levels in total.
4. Select to confirm or select to keep the original settings.
5. Select to return to main menu screen.