The HDMI Extender 4K set via CAT / IP (DS-55122) is a high-performance video distribution system that includes a transmitter unit. It extends 4K HDMI signals up to 120 meters via CAT6 network cable (point-to-point connection). Additionally, you can use a network switch and individual receiver units (DS-55123) to distribute your video to up to 253 screens via the existing network (IP connection). The additional built-in unidirectional IR interface allows remote control of the input source.