Panasonic ET-CDWL3U Operating Instructions Manual page 7

Keep the wireless LAN card as far away as possible from
devices such as mobile telephones,TVs and radios when
using such devices
Devices such as mobile telephones, TVs and radios use different
frequencies from the wireless LAN card, so that there will be no effect on
either wireless LAN card communication or on reception or transmission for
such devices. However, radio emissions from the wireless LAN card may
cause video or audio interference.
Radio emissions from the wireless LAN card will not travel
through steel framework, metal sheets or concrete.
The radio emissions from the wireless LAN card will pass through materials
such as wood and glass (except for glass which is reinforced with metal
fibres), so that communication is possible because the signals can pass
through walls and floors which are made from these materials. However, the
radio emission cannot pass through materials such as steel frames, metal
sheets and concrete, so that communication is not possible because the
signals cannot pass through walls and floors which are made from such
materials.
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