Panasonic WX-SA250P Operating Instructions Manual page 31

Antenna location
About the coverage area
It is a feature that displays estimated antenna coverage areas (wireless reach) on the map as dotted circles.
You can display and hide them by pressing the "Switch coverage area display" button after placing antennas.
Important
● The displayed circle is an estimate, so calls are not necessarily guaranteed inside the circle.
● If the dotted circle is green, the reach is displayed as an estimate while taking the wall thickness into account.
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