Startechcom hdmi over cat5 video extenders startechcom st121shd50 the startechcom st121shd50 hdmi over cat5ecat6 video extender kit lets you extend hdmi video and audio by up to 50m 165 feet over dual cat5e cables or 40m 130 feet over dual cat6 cables for added versatility the kit features power over cable and only requires a single power adaptor that can be connected to either the transmitter or receiver with support for high definition resolutions of up to 1920x1080 1080p and t