?Package: 1* USB C to dual HDMI adapter. MT-VIKI provices 2-year warranty for any problem, please don't hesitate to send message to us. ✓4K USB C to dual HDMI adapter supports up to 4K (3840X2160P@60HZ), dual monitor with HDMI at 3840x2160@30Hz; also support 1440p and 1080p at 60Hz offered by the DisplayPort MST technology(Important: make sure all your HDMI source, monitor and cable support 4K.). ?USB C Splitter 1 in 2 out Compatiblity: (NOT for all USB-C laptop, not work with HP Pavilion/Lenovo IdeaPad, Make sure yours supports video output or DP Alt Mode with the DP-logo ). It's verified to work with Thunderbolt 3 devices,such as MacBook/MacBook Pro2020 2019 2018 2017,MacBook Air2020-2018,iPad Pro 2018 ,Dell XPS13/15,Samsung Galaxy S9/S9+,etc. ✓Exclusive 65W PD Fast Charging: The MT-VIKI usb c to HDMI adapter power port has three major benefits in this upgrade version.?1?Charge your laptop quickly and steadily without affecting its performance or lifespan. ?2?Save the use of your usb c port. ?3?The stability of video transmission is guaranteed, and the problem of unstable splash screen signal of other products is solved. ✓(Note: need to use with 65W charger). MT-VIKI USB-C to Dual HDMI splitter extended display: Attention: For Mac OS, it ONLY Mirror Mode, Can't extend two different Screen due to Mac OS limitation; For Windows OS, support both SST and MST mode. Pls download about instruction.