http://www.target.com/Cisco-Linksys-High-Performance-Wireless-N-Adapter/dp/B003B20F5E/ref=br_1_9?ie=UTF8&id=Cisco%20Linksys%20High-Performance%20Wireless-N%20Adapter&node=10831381&searchSize=30&searchView=list&searchPage=1&sr=1-9&qid=1293783390&rh=&searchBinNameList=target_com_category-bin%2Ctarget_com_brand-bin%2Cprice&searchRank=salesrank&frombrowse=1 i want to know what it does, and what it is