What you get : 1*USB Type C to Dual HDMI Adapter. TECHTOBOX professional brand offers 2 years worry-free warranty and 24/7 friendly customer support. If you have any questions about this dual display adapter, please feel free to contact us and we will do our best to help you. 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 usually see the DP logo next to the port if this is the case).This HDMI reader works well with Thunderbolt 3/4 compatible devices, such as MacBook/MacBook Pro, MacBook Air, iPad Pro, Dell XPS13/15, Samsung Galaxy, etc. Plug & Play: Easy to set up, works natively on your device, supports DP Alt mode; Dual HDMI display adapter is plug & play, no drivers or software required. Supports Samsung Galaxy series cell phones to connect into Samsung Dex mode. (Note: Please connect the monitor (HDMI port) first, then connect your laptop or cell phone (USB C port), you may need to change the "Default Audio Output Device" setting in System Preferences to get sound). Stabilised 4K@60Hz video output: This USB C to HDMI adapter supports up to 4K resolution (3840X2160P@60Hz), dual monitor with HDMI at 3840x2160@30Hz; dual monitor HDMI adapter also supports 1440p and 1080p at 60Hz offered by DisplayPort MST technology. (Important: ONLY if your devices support 4K resolution, the video output will be 4K, please make sure to use HDMI 2.0 cable or better). USB C to Dual HDMI Adapter: Connect your device to two external displays with 4K HDMI output via USB C (Thunderbolt 3) ports; enjoy movies, games with your family on the external UHD big screen. (Note: For Mac OS, it only has mirroring mode and can't extend two different screens; Windows OS supports both SST and MST modes).