First thing you gotta know is which OS your H/PC is. The 680's OS is Handheld PC Professional
(Windows CE 2.11
). Look in the Hardware Compatibility List on this site.
(Links are on the home page.
) Look under "Wireless Network Cards." You'll see a long list of WiFi cards that work in H/PCs. As you run down the list, check the third column to see if the card is compatible with H/PC Pro.
You should also search the Handheld PC Professional forum on this site, using keywords like " 680 wireless cards" or "680 WiFi cards." You'll find several threads where this has already been discussed.