USB C to Dual HDMI AdapterDnkeaur USB C to Dual HDMI Adapter is able to connect a USB C port to two HDMI displays. Note: Android system only supports AAA mode(mirror mode); macOS supports AAA, and ABB mode (does not support MST ABC mode); Windows OS supports AAA, ABB, ABA, and ABC mode. 4k@60HzWhen a single HDMI port is working, the resolution is up to 4K@60Hz. When both HDMI ports are working, the maximum supported resolution is limited to 4K@30Hz. This USB C to HDMI adapter is backward compatible with 60Hz for resolutions of 2K/1080P. Please note:(Important: ONLY when your devices support 4K resolution, the video output will be 4K,please make sure to use a HDMI 2.0 cable or better. Plug and PlayNo external power supply is required for this USB C to HDMI Adapter, just plug and play, and no need for any driver. Note: NOT for all USB-C port laptops, Make sure your laptop or PC supports Thunderbolt 3 or displayport output modeDP ALT mode.Note: If you are not sure