The listing, PCMCIA Expansion Cards (WLAN G) has ended.
If you're looking at this, you most likely know what these are. But for those who don't these are expansion cards for older laptops that provide wireless connectivity. Sometimes, it is cheaper to get one of these, install the drivers (may need to be downloaded on another computer to install on a problematic computer) and be online again rather than replace an internal WLAN card which has failed. Auction is for one. Specify which one once you win.