Roberts Radio RD-41 - Manual (Page 60)

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Auxiliary input
Your radio has an auxiliary (line-level) audio input which you can use
to allow your radio to be used as an external amplifi er for MP3 players,
compact disc players and similar devices.
Simply connect the external audio source to the radio's line input
socket (on the back of the radio) using a 3.5mm stereo plug. When
the plug is inserted the radio display will automatically be blanked.
Use the volume and bass and treble controls on your radio to adjust
the sound level as needed. Note that you may also need to set the
output level on your external device to a higher level than used for
normal listening.
Remove the lead from the Line input in order to permit normal operation
of your radio.