These are files to build a small momentary to RED converter board. One side inputs a momentary start/stop signal as well as 6-36V, and the other side gives a Shmitt-trigger 3.3v logic level signal that can be fed into REDs Sync port.
These don’t have camera connectors, they’re for people who can solder and want to integrate it into a underwater housing, wireless FF system, remote head, etc. that use the other type of trigger.
A red/green onboard LED indicates the current status, and a small pushbutton allows the board itself to act as a small remote trigger.