It has mains input which is fed to a relay board and then on to the actual appliance (usually a lamp) - this is used for final testing, which is all remote (via MQTT) as I don't like going near bare mains wires - and neither should you!
Most of the "bench" testing is done with 12v input from a PSU which is dropped to 5v by an L7805. That's fine for the Wemos D1, as it has an oboard 3.3v LDO, but when I'm testing ESP-01S, it doesn't, so there's a socket to take an external 3.3v LDO (an AMS1117) on a 3-pin breakout board.
The baseboard itself is from a company that doesn't seem to make them anymore, which is a shame as they are solid, rigid and very well-made.
Next comes the Wemos "tripler" base - a lovely piece of kit, but with a serious "gotcha" (see later post)
And then the separate sub-assemblies each of which I will detail in a separate post
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