Roberts Radio RD-25 - Manual (Page 19)

If you need any further advice, please call our Technical Helpline on :-
020 8758 0338 (Mon-Fri)
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FM Stereo/Mono
1. If a station being received is weak some hiss may be audible. To
reduce the hiss press and release in the Tuning control until the
display shows "Audio mode : MONO" your radio will switch to mono
mode.
2. To return to stereo mode press and release the Tuning control until
the display shows "Audio mode : AUTO", your radio will switch to
stereo mode.
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