Roberts Radio RD-12 - Manual (Page 13)

If you need any further advice, please call our Technical Helpline on :-
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12
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.
Display backlight
1. The display backlight will be switched on for 8 seconds when any
button is pressed.
Line out socket
A 3.5mm Line out socket located on the rear of you radio is provided
for connecting the audio signal to an external amplifier. Inserting a line out
audio cable will not mute the internal loudspeaker. Set the volume control
to minimum if desired.