Panasonic KW-WP1050E Operating Instructions Manual page 17

Introduction
Obstacles during Wireless Connection:
The radio wave range may decrease depending on the surrounding environment or
existence of obstacles. If obstacles such as the following are placed between the base unit
and the handset (or a wireless device), radio waves will weaken.
Therefore, even if the distance between the base unit and the handset (or the wireless
device) is short, noise may be heard.
L A metallic door or shutter
L A wall with an insulation material that contains aluminum foil
L A wall made of tin
L A wall made of concrete, stone or brick
L Fireproof glass
L Several walls separated by open space
L A steel shelf
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