Panasonic KX-TG6823AL Operating Instructions Manual page 5

Introduction
Expanding your phone system
Handset (optional): KX-TGA681AZ
You can expand your phone system by
registering optional handsets (6 max.) to a
single base unit.
R Optional handsets may be a different
colour from that of the supplied handsets.
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TG68xxAL(en)_0126_ver110.pdf 5 2015/01/26 16:20:33