Is this for your Windows CE device ?
If so:
The wpc300n is a Cardbus card and isn’t compatible with CE. Here’s an article explaining the differences between PCMCIA and Cardbus
https://www.hpcfactor.com/support/cesd/200194/understanding_pc_card_...
Also I recommend going through the HCL here and selecting a card that is compatible for Windows CE AND has the drivers available for your correct processor.
Here’s the HCL link
https://www.hpcfactor.com/hcl/
If you’re looking for a good wireless card that’s pretty widely supported albeit is wireless B and only uses WEP there’s the Cisco aironet
https://www.hpcfactor.com/hcl/detail.asp?hcdid=102