Sangean DPR-32 (V1) - Manual (Page 14)

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FM Audio If the FM radio station being listened to has a weak signal, some
hiss may be audible. It is possible to reduce this hiss by forcing
the radio to play the station in mono rather than auto.
System Setup press the jog wheel to select from the following settings options:
Sleep: your radio can be set to turn off after a preset time has
elapsed. The sleep timer setting can be adjusted between 5 and
20 minutes in 5 minute increments.
Contrast: turn and press in the jog wheel to select required LCD
display contrast. Display contrast will change accordingly.
Factory reset: press in and turn the jog wheel to select YES
or NO. Select YES to erase all saved settings, station lists and
favorites. All settings will revert to factory default.
SW Version press the jog wheel to view software version installed in the radio.
Back press the jog wheel to go back to the previous page.