For windows only not mac compatible use a thunderbolt 3 port on your windows system to run resource demanding applications on two uhd 4k displays connect two uhd 4k displays to your computer through a single thunderbolt 3 port run resource demanding applications on 4k displays at 30 hz without draining system resources works with thunderbolt 3 devices like elitebook x2 1012 g1 dell xps 13 9350 zbook 15 g3 17 g3 hdmi adapter thunderbolt to hdmi hdmi to thunderbolt usb c to hdmi thun