I get a voltage message when I use these octopus converters without attaching anything crazy to the Pi, just a camera. I strongly recommend not buying them for this purpose. If it works for you, then you're in luck. There are no markings on the board that have a positive and a negative unless you are really good with your electronics. You will have a hard time soldering properly. Don't skimp, just buy something better for your Pi, you'll still get it.
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