I got mine from Amazon. Just search for DisplayLink and all the compatible adapters will show up.

Once you install the DisplayLink app and plug in the hardware, you will get your phone displayed to an external monitor.

There is another app, called SecondScreen that will help you with toggling the phone display that you get an approriate resolution on your external monitor.

The adapter I use is here: https://www.amazon.com/gp/product/B01CSG7TUC/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

While all of this "works", the whole process is quite clunky and far from the "Dex" experience I am trying to replace. I just ordered the OnePlus 9 and will report back if displayportout works or not.

FYI

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read that this should work

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https://www.amazon.com/Wavlink-2048x1152-External-Projector-XP-Black/dp/B01CSG7TUC/ref=sr_1_3?dchild=1&keywords=DisplayLink+pixel&qid=1618605749&sr=8-3

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will try it

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we need more options