Efficient Networks EEE 802.11b/g Wireless USB 2.0 Adapter - Manual (Page 38)

IEEE 802.11b/g Wireless USB 2.0 Adapter Version 1.2
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3.2.4.2 Ad Hoc Settings
h Wireless Mode: Place a check in the preferred frequency and data
rates.
h Network Type: Select Ad hoc from the drop-down list.
h 802.11 Preamble: This setting should be the same as the access point.
If you are not sure of that setting, select Short & Long.
Click on the OK button to return to the previous window