IBM ThinkPad X41 Series Regulatory Notice page 15

Attention: The ThinkPad X41 Tablet Series computer contains an authentication mechanism
You can install or remove each wireless feature by yourself. If you install an unauthorized wireless
adapter that is not approved for use in the ThinkPad X41 Tablet Series computer, the computer will not
start, but only displays an error message and emits beeps.
II) Low power license-exempt radiocommunication devices (RSS-210)
Operation is subject to the following two conditions:
1. This device may not cause interference, and
2. this device must accept any interference, including interference that may cause undesired operation
of the device.
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ThinkPad X41 Tablet Series Regulatory Notice