Panasonic KX-PRW130 Operating Instructions Manual page 3

Handset (optional): KX-PRWA13
You can expand your phone system by
registering optional handsets (6 max.) to a
single base unit.
L Optional handsets may be a different color
from that of the supplied handsets.
Your smartphone: 4 max.
You can expand your phone system by installing the Smartphone
Connect app on your smartphone and registering your smartphone
to the base unit.
L You must configure the base unit and download the app before
you can use these features. See the "Smartphone Integration"
chapter beginning for more information.