Run the most resource demanding applications on two 4k displays without sacrificing performance this high performance thunderbolt 3 adapter lets you add two 4k 30hz hdmi displays to a computer through a single thunderbolt 3 usb c port functioning as an external 2 port graphics adapter with audio support this is a compact and convenient alternative to a laptop dock for times when you dont need full docking capability plus the display adapter keeps other thunderbolt 3 ports free so yo