USB C to Dual HDMI Adapter, Docking Station Dual Monitor, Type C to HDMI Splitter for 2 Monitors, Supports 4K@60Hz and Dual 4K@30Hz. (MacOS only Supports SST Mode) for Laptop HP Dell Surface. 4k@60HzWhen a single HDMI port is working, the resolution is up to 4K@60Hz.