Does not support MST on Mac OS: For Mac OS, it only has mirror mode, and cannot extend two different screens due to Mac OS limitation. Not suitable for all USB-C port laptops, for example this adapter does not work with HP Pavilion/Lenovo IdeaPad, you need to confirm that the C port of the host device supports video output or DP Alt mode, if this is the case, you can usually see the DP logo next to the port Dual 4K Video OutputPlease note: The video output will be 4K only if your device supports 4K resolution, please make sure to use an HDTV 2.0 or better cableThis USB-C to HDTV adapter allows you to mirror or extend your laptops display to two monitors simultaneously with resolutions up to 4K@30Hz, or up to 3840X2160P@60HZ when using a single HDTV port. 100W Power Delivery and USB Data Transfer: Dual HDTV Adapter for 2 Monitors supports up to 100W fast charging (Does not come with a charger) and features a USB port for connecting various USB-C devices like hard drives, printers