Holux GPSmile51B - Manual (Page 33)

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6. To finish the calibration procedure, press the Enter key to accept
the new settings. Press the Esc key to keep the old settings.
7. Select to go back to the main menu screen.
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.
(1 min, 3 min, 5 min, 10 min, 30 min, Always On)
3. Select the time to turn off backlight when running off external power.
(1 min, 3 min, 5 min, 10 min, 30 min, Always On)