Ideal if you have a weak WIFI signal at your boxes location.
A Powerline adapter is a device which uses your homes electric wiring to transmit communications signals. The adapters (at least two) plug into your wall sockets and use Ethernet cables to connect to your router at one end and your device at the other (TV, games console, PC whatever it may be).
This provides a physical connection between your device and router as opposed to the wireless connection provided by your Wi-Fi. Powerline is now a well establish technology and over time the speeds they are capable of has steadily increased and they now theoretically match the top speeds of Wi-Fi (1300Mbps). Hopefully the diagram above will make it a little simpler to understand.
Where to buy: