IBM ThinkPad T23 2647 Supplementary Manual page 79

v It accepts any interference that may cause undesired operation.
Exposure to Radio Frequency Radiation
The radiated output power of Wireless LAN Mini-PCI Adapter is far below
the FCC radio frequency exposure limits. Nevertheless, the ThinkPad T23
shall be used in such a manner that the potential for human contact during
normal operation is minimized as follows:
v CAUTION: To comply with FCC RF exposure compliance requirements, a
separation distance of at least 20 cm (8 inches) must be maintained between
the antenna of this device and all persons.
v The FCC certification of this ThinkPad wireless model, at time of this
manual's printing, prohibits the use of any other Radio Frequency (RF)
wireless device while the integrated wireless LAN card is in use. The FCC
certification requires that you disable the integrated wireless LAN device
before you use any wireless PCMCIA cards or the Bluetooth option. Please
visit the IBM site at www.ibm.com/pc/support for an updated list RF
devices that have received FCC certification on your ThinkPad.
Interference Statement
An improper installation or unauthorized use may cause harmful interference
to radio communications. Also any tampering of the internal antenna will
void the FCC certification and your warranty. Refer to the "Electronic
emission notices" on page 58 for more detail.
Transmitter antenna
position
20cm
Appendix B. Product warranties and notices
71