NO. You need the Duo 500 Adapter which is plugged into mains near your router and an ethernet cable connected from router to duo adapter. The D Lan Wi Fi can then be plugged in where you need connection. Has option of connecting via ethernet cable or of course via wi fi.
Hope this helps
Yes, it is - but it connects to a LAN ring which is connected to the mains supply. You need a wired connection from your router to a Devolo unit which is plugged into the mains. Once you have this, then you buy any number of wireless re-routers like this which you just plug into the mains in another part of the house/building. Most people start off with a "starter-pack". Try Googling: Devolo dLAN 500 Wi-Fi Starter Kit
That will depend on the wireless standards of your mini-system, but if it is relatively new, then yes, it should work. remember the devolo connection is password protected. If you can't enter a code on your system then you may have a problem.