Posting this using this, courtesy of next doors internet.

HOT!

Have a couple of TP-Link versions of this and have had mixed success with them. If you have a fairly clear line of sight then they work fine, but if there's a fair amount of material between the main router and the extender then I've found performance to be patchy. For example, I have two currently working to relay the signal down to my office in the garden and they perform very well. On the other hand, I have another relaying the signal upstairs in the house and coverage and connection to the router downstairs is patchy.

That said, these are a great price! Might as well give them a go, and then return them if they're no good...

Is this just a repeater or can you plug it into a powerline using the ethernet cable and use it as a second access point elsewhere in the house?

yes I think so. So extending your wifi signal.

cheap and good

why my comment doesn't appear in the app.

It can be used as an access point as well, so yes you can plug in an Ethernet and set it up as a new WiFi spot.

No ethernet network that i can see, only connect a device to the extender using an ethernet cable
"Fast Ethernet port, connect a wired device like a Blu-ray player, game console, TV or streaming player to your Wi-Fi network"

You can also use this as an access point. You would connect it to your router using an ethernet cable and accessing your network/internet through wireless connection.