, Launch DeX mode on your Galaxy Note9 or Galaxy Tab S4 , Supports HDMI 2.0 and 4K video screen mirroring , DeX Cable is now all you need to use Samsung DeX , Plug the HDMI end to your display and the USB-C to your Galaxy Note9 or Galaxy Tab S4 and you're ready to go , The ultra-simple design is easy to use and carry, and responsive when connected