**Please make sure your device's USB-C port supports video transmission, because some devices' USB-C ports only support charging or data transfer. macOS devices do not support MST mode when connecting two monitors, 2 monitors can only display the same content**HDMI Adapter for Dual Monitors This dual hdmi usb c adapter extend your laptops usb c port into 2 hdmi ports 4K@60Hz, convenient for you to share the contents of your laptop to 2 external monitors, greatly improves your work efficiency. It is an ideal usb c accessories for programmer, data analysts, photographer, etc. Crystal Clear Dual 4K Video OutputUSB C to HDMI adapter allows you to display the content of your laptop to 2 monitors at the same time at 3840*2160@30Hz. When only using one HDMI port, the resolution can up to 3840*2160@60Hz. Note: Please make sure that your laptop, monitor, HDMI cable support 4K or 60Hz, otherwise, the output will not be 4K or 60Hz, the actual resolution depend on your devi