Here's the final box, if someone wants to build one:

Useful for power-cycling devices-under-test remotely.

Note, the relays are rated for mains 240V, however this case offers no safety features for high voltage use.

@jhol What's the chip on those boards? It's got to be some sort of MCU with built-in USB right? What's the USB protocol like?

It's an ATTiny and it implements an HID interface. Someone's already written a python interface to it: ...and there may be others.

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