The is a brand new dual band wifi Adaptor. It supports both 2.4ghz (11N) and 5ghz (11Ac) frequencies and data speeds up to 600 Mbps. .
It works with Windows and Applw Macs.
If you have any old PC without wifi then this is what you need.
You can also use this to upgrade your 2.4ghz wifi to 5ghz.