NZXT Doko is a gaming device that extends the range of your gaming PC so you can sit back in comfort and play games on your TV. The idea is that your gaming PC is over there, probably near your router, while your TV is some distance away, probably in a different room. You need to connect Doko to your router using Ethernet with the HDMI output used to connect to your TV. Then, when you run a utility called Sender on your PC, Doko is able to mirror your PC display on your TV.