You know you want to look your best, at the same time you should sound your best, by only using a FOX40 pealess whistle. The Fox 40 Pealess Whistle is much like a harmonically-tuned instrument,
because it produces three slightly different frequencies
simultaneously. The different frequencies are superimposed on one
another out of phase, and thus alternately reinforce and cancel out each
other. The result is a loud, piercing vibrato that has no moving parts
to get stuck. The whistle is a plastic-molded injection process that is
ultrasonically welded together, rather than glued.