Adapter 4 in 1: Attention: For Mac OS, it ONLY Mirror Mode, Can\t extend two different Screen, due to Mac OS limitation; Connect device with USB Type C (tunderbolt 3) port to two external monitors with 4K HDMI output; You can enjoy movies,games with your families on external ultra HD big screen; Windows OS supports both SST and MST mode, if you not sure how to setting, please contact us, or download the user guide in Product information->Product information.Wide Compatibility: (Note: NOT for all USB-C port laptop, such as this adapter CANNOT work with HP Pavilion/Lenovo IdeaPad, You need to confirm that your host device\s C port supports video output or DP Alt Mode, and you can normally see the DP-logo next to the port if this is the case, ).This HDMI Reader works well with Thunderbolt 3 compatible devices,such as MacBook/MacBook Pro2020 2019 2018 2017,MacBook Air2020-2018,iPad Pro 2018 ,Dell XPS13/15,Samsung Galaxy S9/S9+,etcVivid 3D Effect Video Sync: This usb c to hdmi adapter resolution up to 4K(3840X2160P@60HZ), dual monitor with HDMI at 3840x2160@30Hz; Dual monitor USB C adapter also support 1440p and 1080p at 60Hz offered by the DisplayPort MST technology; with this high-performance USB-C adapter when you play games the screen without any millisecond delay. (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.)Hassle-Free Setup: Multi-stream transport offers an easy setup by natively working on device that supports DP Alt Mode over USB Type-C; plug-and-play, no drivers or software required. (NOTED:Please connect the monitor (HDMI port) first, then the laptop (usb c port), You may need to change the settings of "the default audio output device" on system preferences to deliver sound.)