I have tp-link device adaptors but i really tried to reconnect this for my PC but not doing this how was do it again kindly help me find more info here  and many more thank you 

@Solla-topee 

It is a WPA kit where they are AV1000s so one powerline paired to the extender.

I've now since removed them and returned them back to Amazon.

So as per the TP PLC app, it will show that the AV600 that goes into the Plusnet router will have 11Mbps one way but near 135Mbps the other way from the WPA kit or other powerlines which are also AV600s.  Yes there is a red LED because it's under 50Mbps.  But I'm not too bothered about that as the speed test.net bandwidth only has a minimal effect.  At the plusnet router, I'd get 28Mbps but from anywhere else, I'll get 25Mpbs ish depending on usage.  There are 6 of us living there.

But anyway, the next thing that has happened now was the 5G off the extender was crashing the network so I was getting a severe reduction down to 0.2Mbps.  Turned off the 5G and the extender simply failed to work on the 2G days later.  So every change I'd make, would work for at least 3 days and then won't work.  I've plugged the WPA kit into the plusnet router, that made the problem worse as the powerline plug would red line outgoing and incoming on the TP app but the rest of the network would be green and circa 400Mbps.  So the WPA kit was repositioned and the AV600 plug was put back at the plusnet router....but yea, 2 to 3 days and failure.  So when the whole extender failed to work.  I removed the WPA kit and fitted another AV600 powerline because I know they work, fitted a TP link 2x TL-420N wireless routers where one is in access point mode and the other is in repeater mode because the residents were complaining.  I do plan on getting 3 X AV1000 powerline plugs because the throughput to the AV600 might be better and remove the red line but also I want to use the electricity more so the router that's a repeater, I'll put a AV1000 with that router and that'll be another access point.  So far I'm getting a bit more bandwidth than before.

The thing is, I have to be picky with what manufacturer to use.  Linksys routers would have been preferable because they had a booming signal but bought a new one these days and it creates jitter.  I already mentioned about the Devolo, netgrear, I haven't tried yet so because I'm getting more mileage out TP-Link products then I'll keep to them for now.

Network layout yes

Three floors

Bottom floor, plusnet router, kitchen in the back, two rooms with an AV600,

Middle floor, three rooms, AV600 connected to 420N wireless access point, further across the middle landing, another 420N wireless router repeater.  Top floor, one room, nothing there, she camps off the two middle floor 420N routers of her choice.

When I had the WPA kit, they were on the middle floor.

Put in the AV1000s and that cleared up the red lines.  Next is the two routers and some confusion with the speedtests.  I have an xbox and a laptop on the router LAN and a mobile wifi'd into the same router.  According to speedtest, I'll get 14 - 20 Mbps on the laptop, same again on the xbox then 9Mbps on the mobile phone though only the xbox is playing Destiny 2.  I find that these internet speed testing just gives tunnel vision and creates whining with the others in the house.....lol.  We'll see how it performs after a month.