The Atlona single gang wall plate HDMI Extenders allow you to transmit 1080p signals up to 80 feet over dual CAT5 cables, and 100 feet if you would have used CAT6. The AT-HD-SR consists of sending and receiving units which are both PASSIVE. Most of the HDMI Extenders you will find do require power at least at one of the ends. The Atlona wall plates are based on a unique technology which allows full support of HDMI 1.3 specifications (Including high resolutions up to 1080p and HD Audio Formats).