Sangean WR-22 (V1) - Manual (Page 37)

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Auto Dimmer
The dimmer sensor is located on the front of the radio which will
adjust the intensity of the display to suit room brightness.
Dimmer control
The brightness of the LCD display may be adjusted.
. Press and hold the Info/ menu button to enter the menu setting.
2. Rotate the Tuning control rotary until ‘DIMMER’ shown on the
display. Press the Tuning control rotary to enter the setting.
3. Rotate the Tuning control rotary to adjust the LCD backlight to be
darker or brighter. Press the Tuning control rotary to confirm the
setting.
Note:
The default setting of the dimmer level is at the lowest. Please
adjust your dimmer level as appropriate.