KOZYC USB C to Dual HDMI Adapter can 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 When 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 [email protected] 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 No 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 This USB C HDMI Adapter is compatible with Linux, Windows, Mac OS, & Android systems, with compatible Thunderbolt 3 and DP 1.4 alt mode. Support: MacBook/ MacBook Pro, Dell XPS, LG, HP, Samsung Galaxy, etc