Sangean RCR-3 (R2) - Manual (Page 22)

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Display backlight
The brightness of the display can be adjusted when the radio is in
Standby mode and when it is in use. Press the Backlight button
and the display will illuminate. To turn off the backlight, press the
Backlight button again.
At the same time, you can adjust the display backlight level by
rotate the backlight control at the bottom of your radio.
Factory reset
If you wish to completely reset your radio to its initial state this may
be performed by the following procedure..
1. Press and hold the INFO/MENU button to enter the menu setting.
2. Press the TUNING up/down button until “FACTORY” shown on
the display. Press the Select button to enter the setting.
3. Press the TUNING up/down button to select ‘YES’, and press the
Select button to confirm the setting . A full reset will be performed.
The station list and presets will be set to empty. Alarms will be
cancelled and timer and sleep timer settings will be set to their
default values.