This item should be usable via Wireless also. In order to install this follow the procedure:

Plug one P200 adapter into an electrical outlet near your router and connect it to your router using an Ethernet cable.
Plug the second P200 adapter into an electrical outlet in the room where you want to extend your network coverage.
Connect your device (computer, smart TV, etc.) to the second P200 adapter using another Ethernet cable or through Wi-Fi.
Press the "Pair" button on both P200 adapters to establish a secure connection between them.
Wait for the adapters to synchronize, and you should have an extended network coverage in the room where you plugged the second P200 adapter.