I can't get the HDMI port to work. What should I do? Try some of the following steps: 1. Confirm if the connected USB-C port of your device supports DP Alt Mode. To do this, please consult your device's user manual, contact the seller, or check the manufacturer's website. 2.Try a different computer and HDMI cable to see if the issue still persists. 3.Plug your HDMI cable directly into your device and see if you get a stable connection. If you can't get a stable connection, then the problem is with your HDMI cable. 4.Verify that your monitor is configured to the correct input (HDMI). 5.We provide you with 1 year after sale guarantee. If you are still unavailable after following the above steps, you can contact our customer service.

?Wide Compatibility?Supports laptops, phones and tablets and USB C devices in DP ALT mode (display output) or Thunderbolt 3.(Kindly reminder: for devices with USB 3. 1 Gen 1, It may take longer time to sync, Please be patient and give it more time). ?Dual Mode Display?Support Mirror and Extend mode, allows you to mirror/extend video/image whenever needed. Perfect for making a presentation or connecting an external monitor in school/office/home. ?4K Resolution?Supports UHD. HDCP compliant. Give you clear and vivid 4K@30Hz high resolution, backward compatible with 1440P@60hz, 1080P@120hz. ?Plug & play?Aluminum USB C to HDMI Adapter delivers clean, vivid, seamless video. plug-and-play,No additional driver/software required.(Note:Uni-directional, only from a USB-C host device to HDMI displays.). YACSEJAO USB Type C to HDMI Adapter can be used for smartphones, tablets, laptops projection to TV or monitor.Widely compatible with multi-brand devices, support 4K.