Devolo dLAN 550+ Duo+ Ethernet Powerline Adapter. Important to note is that the software may not be working properly anymore and Devolo no longer supports these units. I've sold three already, one person couldn't find it in the network using the software, and the other two were able to use them without the software - so they're still working, you just may not be able to see them in the software but since this is my last one I can't find out for myself.
eBay