Can I use the StarTech.com MSTCDP122HD with Thunderbolt 3 ports?

Yes, the StarTech.com MSTCDP122HD is compatible with Thunderbolt 3 ports.

What is the maximum resolution supported by the StarTech.com MSTCDP122HD hub?

The maximum digital resolution supported by the StarTech.com MSTCDP122HD hub is 3840x2160 at 30 Hz.

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StarTech.com MSTCDP122HD 2-Port USB-C to HDMI MST Hub - 4K 30Hz - Dual Monitor Video Splitter - Windows and Thunderbolt 3 Compatible (MSTCDP122HD)

Dual monitor splitter enables you to connect two separate displays to your USB-C device, helping to increase your productivity.
USB C hub uses multi-stream transport technology that uses your existing video card to preserve system resources while delivering UHD resolutions.
Dual monitor adapter delivers astonishing 4K picture quality on both displays simultaneously.
USBC to HDMI MST hub works with Thunderbolt 3 ports and?USB Type-C ports that support?DP?Alt Mode.