Efficient Networks EEE 802.11b/g Wireless USB 2.0 Adapter - Manual (Page 41)

IEEE 802.11b/g Wireless USB 2.0 Adapter Version 1.2
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3.4 Enable / Disable Radio
To disable the radio, click on Action in the menu bar, and then click on Disable
Radio.
You will then see a confirmation message “The RF signals for the following
network card(s) have been successfully disabled”.
Click on the OK button to continue.