Question about Devolo Magic 2 LAN triple

It has a video and a downloadable brochure describing the function.

Simply put, it turns the power line into a network cable. So you could use the internet in another room where there is no router. But you need at least one router (internet connection) that is connected to such a device. Then another one in another room where you otherwise have no internet.

This device is the wired version without WiFi. However, there are also devices with wireless transmission that can be used to "boost" the WiFi signal in other rooms.

Is that expressed in an understandable way?