Roberts Radio RD-22 - Manual (Page 30)

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Headphone and optical output sockets
1. A 3.5mm Headphone Socket located on the rear of your radio is
provided for use with either headphones or an earpiece. Inserting a
plug automatically mutes the internal loudspeaker.
2. A digital optical output socket is provided on the rear of your radio for
connection to an amplifi er, mini-disc or other equipment with a digital
optical input.
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