Panasonic KX-TGM420 Operating Instructions Manual page 11

Expanding your phone system
Handset (optional): KX-TGMA44*1/KX-
TGMA45*2
You can expand your phone
system by registering optional
handsets (6 max.) to a single
base unit.
• Optional handsets may be a
different color from that of the
supplied handsets.
*1 Maximum receiver volume is 40 dB (when the
booster is on).
*2 Maximum receiver volume is 50 dB (when the
booster is on).
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