Debroglie made (or at least branded) this specific board which explains the lack of WEEKIN.

I haven't taken a measurement, but I suspect that all those small 3-pin chips (U12, U26 for example) are 3.3V regulators dotted about across the entire board instead of one main regulator. 

The RP2040 powers the board, with a fat 2MB of FLASH memory (relatively speaking, compared to the Pro Micros on the AirBerries that was 32KB or something miniscule like that). RST1 = Reset, RST2 = BOOT so holding RST2 and pressing RST1 restarts the board in the bootloader. 

D1 is a cyan power LED, a nice change of pace from red/green/blue.

Compared to everything else, the A5050 has a relatively poor-looking solder job. It does work though and the angle of 4 degrees is minor enough that I can control it with either hand without noticing.