Roberts Radio R9943 - Manual (Page 17)

If you need any further advice, please call our Technical Helpline on :-
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16
Headphone socket
A 3.5mm Headphone Socket located on the right-hand end of you radio
is provided for use with either headphones or an earpiece. Inserting a
plug automatically mutes the internal loudspeaker.
FM Stereo/Mono button
1. If a station being received is weak some hiss may be audible. To
reduce the hiss press and hold down the FM St./Mono button to
switch to mono mode. The stereo indicator will be removed from the
display.
2. Press and hold down the FM St./Mono button to return to FM
stereo operation.
Note: FM stereo is only available when using earphone/headphones