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I have seen them but not tried them because none of the birders I know uses them--so I assume they don't work, but I could be wrong. What works is high-percentage DEET and soaking your clothes in permethrin.
Just to be clear, I hate DEET, lol. But I am a mozzie magnet and it's the only thing that works reliably, for me. It's nice that there are other options these days, as well.