The st121hdbt5 hdmi over cat5 video extender kit lets you extend hdmi audiovideo up to 330 feet 100 meters over a single cat5e6 cable for added versatility both the transmitter and receiver can be powered by the same single power source using power over cable poc to help save you installation costs the hdmi over cat5 extender also extends rs 232 serial and ir through the same non proprietary cat5e cat6 ethernet cable offering flexible control of local devices from the remote locatio