Roberts Radio CR9937 - Manual (Page 8)

Display backlight
During automatic setup and radio text, the display backlight will remain
on. The display back light will be switched on for 10 seconds whenever
any button is pressed.
The display backlight can also be set to remain on at 3 different levels,
dim, bright and off.
1. Press the Light button for dim backlight, press once again for bright
backlight and once again for off.
Night light
1. Press the Night Light button to adjust level of night light, press once
for dim light press once again for bright light and once again to switch
off.
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