Brand New High Quality - One pair as a full functional module, no need of setting. CAT-5e/6/7/8 cable can substitute HDMI cable to achieve long-distance transmission. Standard of IEEE-568B. Transmission distance can be up to 30 meters for 1080P, up to 5 meters for 4k*2k using CAT-6 cable. Support hot-swapping. Plug and play.