Question 1

Does the hub (that plugs into the router) have wifi or is it just on the second wifi unit? can't mesh with just 1 access point?

Accepted Answer

Good question! It had me foxed.  I didn't find the instructions as clear as they might be.
The second unit (Magic 2 wifi 2-1)- the larger one with the 2 ethernet sockets has a passcode on the back marked 'wifi'.  That's the one to use.  I paired them in double wall sockets and left them for 10 mins to get to know each other before plugging in the 
Tips: It helps to download the Devolo Home Network app.  The app will give you a graphical display of your devolo network and which unit is giving a wifi  signal and whether you have an internet connection, as well as the technical stuff. IP, Mac addresses etc. You can also give your units  nicknames to help you keep track of them.
If you throw out the box, keep the side with the barcode which you can use in future to pair the units using the phone app. 
I hope this helps - I'm not a network geek!
BW

Question 2

Will these units work on two separate ciruits in the same house?

Accepted Answer

Yes, they work on separate circuits. The only requirement is that they're on the same electrical phase, and most domestic premises will be. If units are on separate circuits, the implication is that the signals have to transverse both circuits via the main consumer unit with circuit breakers, so typically a longer path than if on the same circuit. The speeds might be a little lower, but it all depends on the cables and connections individual to a house. I have no problems running four of these units across three mains circuits.

Question 3

Can this be used with an extension cable or does it only work by being plugged into the wall socket?

Accepted Answer

You can use it on a one socket extension cable but not on a multi socket extention. It would be better if you plugged the powerline unit into the wall socket and plug the extention into the socket on the front of the unit.

Question 4

I have netgear ethernet extenders in place, can these be used with them?

Accepted Answer

They can be used alongside them, not with them.  You will effectively have two completely separate networks (on two separate SSID's) going back to the same router. They will have their own login credentials. I did this some time ago with the kids, so I could limit their data usage and access without affecting my work at home network, which I kept secure at a different level. see less

ASIN	B07H5YPC7D
Box Contents	1 x Devolo magic 2 LAN add-on adapter, 1 x Devolo magic 2 Wi-Fi add-on adapter, 1 x Ethernet cable, User guide
Brand Name	devolo
Color	White
Compatible Devices	Smart TV
Customer Reviews	4.2 4.2 out of 5 stars (189)
Data Link Protocol	IEEE 802.3
Data Transfer Rate	2400 Megabits Per Second
Item Type Name	devolo Magic 2 WiFi Starter Kit
Item Weight	0.63 Kilograms
Manufacturer	Devolo
Manufacturer Part Number	8385
Model Number	8385
Number of Items	1
Product Warranty	3 years

devolo Magic 2 WiFi Starter Kit

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