Sangean WFR-20 (R1) - Manual (Page 57)

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Headphone socket
A 3.5mm Headphone Socket located on the rear of your radio is
provided for use with headphones. Inserting a plug automatically
mutes the internal loudspeaker.
IMPORTANT:
Excessive sound pressure from earphones and
headphones can cause hearing loss.
Line out socket (3.5mm Jack)
A 3.5mm Line Out socket located on the rear of your radio is provided
for connecting the audio signal to an external ampli.er. Inserting an
audio cable into this socket will not mute the internal loudspeaker.
Set the volume control on the radio to minimum if desired.
GB