USB 3.0 to Dual HDMI Adapter KOZYC 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 (3840X2160P@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: If you want to get a 4k resolution, please make sure your device supports 4k and uses a HDMI cable 2.0 or better