I have two of these things (the друг is Russian for 'friend'), they allow you to toggle power to a micro USB device under software control, useful for remote reboots of Pis when they crash provided you've got a second device that can toggle the power.
These would have been a tidier solution than using USB relays and barrel connectors to micro USB adaptors, plus they handle data too. I'll let someone else take these as I already have a working solution.
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