Sangean DPR-65 (V1) - Manual (Page 26)

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4. Press the Tuning Up/Down button to switch on the Mono-Override.
While this setting is engaged, the radio will play the current station
in mono whether listening via headphones or the loudspeaker. Mono
Override is a temporary setting and is applied to the currently tune
station only. It is cancelled automatically by tuning to another radio
station.
5. If you wish to cancel Mono-Override while listening to the currently
tune radio station, press and hold the Info button and press the
Tuning Up/Down buttons until the display shows “Mono Override”
on the lower line. Press the Select button. The lower line will show
“Override On” if the radio is in the Mono-Override mode.
6. Press the Tuning Up/Down button to switch off the Mono-Override.
The radio will play the current station in stereo through headphone
if the signal is sufficiently strong.