Transmitter power cable internet PLC
PLCs are but a couple of devices that connect two network plugs housing for an internet connection without throwing an additional UTP cabling. Internet function through the mains. The connection is made between point to point between PLCs.
The PLC communications are secure, as only connect between devices on the same electrical circuit. The electrical circuits are not shared between neighbors, even if you live in a community of neighbors and his other neighbor has another PLC will not be possible to ever connect your PLC to the neighbor or the neighbor connect with yours.