Fox 40 Whistles Pearl Whistle with lanyard, Black #9701-0008

The Fox 40 Peals Whistle 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. The whistle is injection molded and ultrasonically welded together, rather than glued, for maximum durability. Comes with a breakaway lanyard.

UPC: 066143090810