After someone posted a video online I used two of these units to adapt my old alarm wiring to power two Ring Gen2 keyboards. It's true that the converter's micro-USB connector needs to be sheared off to fit the keyboard connector, but a sharp knife will do just fine. If you want a fully hidden keyboard with a USB cable that runs through a hole in the keyboard bracket, you'll need to carefully maneuver the cable and make sure you can push the slack back into the wall. I'm very happy with the end result and as you can see in the last screenshot of the Ring app, my keyboards are now getting constant power.
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