🇩🇪 MNT Research
MNT Pocket Reform Keyboard USB-C Adapter
Connects the Pocket Reform keyboard to a computer, embedded system, or installation over USB-C, including use of its optical trackball. It also supports re-flashing or recovering the keyboard from another computer. Verified features listed on the official page include built-in 3.3V and 5V power conversion, a power LED, and an unpopulated keyboard UART breakout header for development. The box contents are 1 PCB and 2 four-pin JST-SH cables.
Photos

Image: MNT ResearchSource