IBM ThinkPad R40 series Service Manual page 62

Because Wireless LAN Mini-PCI Adapter and Bluetooth Daughter Card
operate within the guidelines found in radio frequency safety standards and
recommendations, IBM believes the integrated wireless cards are safe for use
by consumers. These standards and recommendations reflect the consensus of
the scientific community and result from deliberations of panels and
committees of scientists who continually review and interpret the extensive
research literature.
In some situation or environment, the use of Wireless LAN Mini-PCI Adapter
or Bluetooth Daughter Card may be restricted by the proprietor of the
building or responsible representatives of the organization. These situations
may for example include:
v Using the integrated wireless cards on board of airplanes, or in hospitals
v In any other environment where the risk of interference to other devices or
services is perceived or identified as harmful.
If you are uncertain of the policy that applies on the use of wireless devices in
a specific organization (e.g. airport or hospital), you are encouraged to ask for
authorization to use Wireless LAN Mini-PCI Adapter or Bluetooth Daughter
Card prior to turning on the ThinkPad R40 computer.
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ThinkPad R40 Series Service and Troubleshooting Guide