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Took all 4 fishing today. 1 of the 4 would not trigger the alarm. It seems some are kore sensitive than others. I could make it sound when I turned it manually, but it would not sound when used in my lines. I swapped with all the others and those worked. If they all worked, I would give 5 stars, but unfortunately there is too much variability. Also, these only work on thicker rod blanks, not ultralight rigs.