Conceptronic CLLSPK21 Quick Installation page 12

ENGLISH
Note:
At the right speaker you can also find a Line-In jack to provide an option for more
than one audio source. The system will automatically switch to the new source to
play songs for it when the line is inserted. This flexible solution allows you to
connect an MP3 player to it without disconnecting your existing line out jack to
the audio source.
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