Help!!!  I purchased a RE450 WiFi extender.  I have a gateway which only supports 2.4GHz.  When I plug the extender in, under my WiFi options I have my home network and 2 choices for the extender (2.4GHz and 5GHz).  I'm choosing to connect throug the gateway WPS button and the extender's WPS button.  I am only able to get a successful connection with the 2.4GHz since the gateway only supports that band.  After connecting, under my WiFi options is my home network.  The two TP extender choices disappear and are apparently replaced by my home network's name followed by 5G.  I'm trying to figure out exactly what this 5G is and why it is labeled 5G?  It is defaulting to that name.  Is that in fact the extender?  My download and upload speeds seem to be faster when I select that option rather than my original home network, but I'm just not sure what I'm connected to.  I'm not tech saavy as you can see so if someone could help explain.