The HDMI Ethernet adapter does not require a power supply and can convert 1080p quality. You only need a CAT-5e / 6 cable to expand the HDTV screen. If you need to transmit over long distances, this device will help you save money compared to using long and expensive HDMI cables. It does not directly support connection with the WIFI router. This HDMI to RJ45 extension repeater breaks the limitation of HDMI cable transmission length. You can use Cat-5e / 6 cable instead of HDMI cable for long-distance transmission. Transmission distance can reach 50 meters and 1080P output.