1. 2 in 1 Dual HDMI Adapter: USB C to Dual HDMI Adapter enables devices with USB Type C (thunderbolt 3) port to connect to two external monitors, allowing you to enjoy movies and games with your families on an external ultra HD big screen. Note: For MacOS system, it ONLY supports SST mode (AAA and ABB mode), which means the external monitors display the same image due to Mac OS limitation; Windows OS supports both SST and MST mode. 2. 4K Vivid 3D Effect Video Sync: The HDMI ports support a resolution of up to 3840x2160@60Hz. When both HDMI ports are in use, the resolution can be up to 3840x2160@30Hz. The usb c to hdmi adapter is backward compatible with 2K /1080P at 60Hz. With this highperformance USBC adapter, there is no millisecond delay when playing games. (Important: ONLY when your devices support 4K resolution, the video output will be 4K. Please ensure to use a HDMI 2.0 cable or better.) 3. Wide Compatibility: Dual monitor Adapter is compatible with Dell XPS13/Dell XPS15, Samsung Galaxy S9/S9, etc. (Note: NOT for all USBC port laptops. For example, 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. If this is the case, you can normally see the DP next to the port.) 4. Plug and Play: USB C HDMI Adapter an easy setup as it natively works on devices that support DP Alt Mode over USB TypeC. It is plug and play, and no driver is required. The dualmonitor splitter is powered by the USB C port, eliminating the need for external power cords. 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' in system preferences to get sound.