Important Attentions
1) Requires USB-C port which supports "DisplayPort Alternate Mode" (Not all USB-C ports/systems support the DisplayPort Alternate Mode function). Please make sure your device support this function before purchase.
2) Check for updated Bios, Thunderbolt 3 firmware and driver, Intel Graphics driver for Windows computers.
3) 4K video resolution requires a 4K capable computer, HDMI cable (HDMI 2.0 version or above is a must), and 4K display. (If your monitor/TV only supports 1080p, you can only output 1080p rather than 4K.)
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Support Mirror & Extend Dual Mode
【Mirror and Extend Mode Settings】
For Mac OS: Top left corner Apple icon-->System Preferences-->Displays-->Mirror or Extend Displays.
For Windows 10: Press Windows key + P combination command-->Choose Duplicate or Extend.
For Windows laptops, if the external monitor doesn’t work, please update the BIOS and graphic card driver from laptop official websites.
【Resolution Issues】
If the resolution of your laptop is higher than the external monitor.
For Windows: Windows Menu--> Setting--> Display--> Advanced Display Settings, set your laptop's resolution same as or lower the resolution of external monitor.
For Mac OS: Left-upper Apple icon-->System Preferences-->Displays-->Mirror displays. Then your monitor would mirror your Mac. However here you have two choices: One is "Optimize For" your built-in Retina Display, the other is "Optimize For" your monitor. You can choose which one you like.