This does exactly what it is supposed to do and is very easy to set up.  It comes with two plugs.  One goes into an AC outlet near my wifi router and an ethernet cable goes from the wifi router to the plug.  The other end goes into an AC outlet near my home theater system - on the other side of the house.  Another ethernet cable runs from this second plug to my blu-ray player - giving me access to online content through my blu-ray player.