When only using one HDMI port, the resolution can up to 3840 2160@60Hz. USB-C to Dual 4k HDMI MST Adapter Splitter, Thunderbolt 3 Compatible, Compact & Portable USB Type C to HDMI Multi Monitor Converter for Macbook, Macbook Pro, Macbook Air, iPad Pro and more (DP Alternate Mode Required), Compatible with Windows, Mac OS, Linux, iPad.