I've tried all four with a Raspberry Pi 4 and a phone but they don't work. It's USB C so I don't know how I can go wrong. Update: Before trying to send them back I did some more experimenting and they seem to work if your power source is USB A and you are using a USB A to USB C cable. But if you use USB C to USB C, no joy. Upgraded from 1 star to 2 because they might work for some people.
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