Panasonic KX-TDA30 Object, Material, Transmission Tendency, Installation Manual

2.8 Connection of 2.4 GHz Portable Stations

Object	Material	Transmission Tendency
Wall	Concrete	The thicker they are, the less radio waves
		penetrate them.
	Ferroconcrete	Radio waves can penetrate them, but the more iron
		there is, the more radio waves are reflected.
Window	Glass	Radio waves usually penetrate them.
	Glass with wire nets	Radio waves can penetrate them, but tend to be
		reflected.
	Glass covered with	Radio waves are weakened considerably when
	heat-resistant film	they penetrate windows.
Floor	Ferroconcrete	Radio waves can penetrate them, but the more iron
		there is, the more radio waves are reflected.
Partition	Steel	Radio waves are reflected and rarely penetrate
		them.
	Plywood, Glass	Radio waves usually penetrate them.
Column	Ferroconcrete	Radio waves can penetrate them, but the more iron
		there is, the more radio waves tend to be reflected
		or diffracted.
	Metal	Radio waves tend to be reflected or diffracted.
Cabinet	Steel	Radio waves are usually reflected or diffracted,
		and rarely penetrate them.
	Wood	Radio waves can penetrate them, but they are
		weakened.

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