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Someone else pointed this out in one of the reviews I read online. When you squeeze the bottle and let go quickly, the bottle squeaks / wheezes as the air rushes back into the bottle. Pressing and releasing slowly does the trick. Would be great if this was resolved so you didn't have to consciously think about this with so many other things happening on the hunt.
Expensive product to know the wind direction but fades away quickly (within 1 yard). Powder comes out of bottle opening even if its closed, had to keep it in a zip loc bag to save the powder. Found similar product at CDN tire for half the price. I wont be buying this again unless its $7.