Our natural cork pea makes our whistle easy to blow a loud, crisp sound every time, even if you're a little out of breath. Great for coaches and referees alike, the demonstrative shrill cuts through crowd noise and player chatter with ease. Wear it on or off the braided lanyard, and adjust the length with the yellow adjustment bead. You can use it easily and effectively in any situation. sports whistle(basketball, volleyball, football, soccer etc.), referee whistle, coach whistle, teacher whistle, guard whistle, lifeguard whistle, emergency whistle, survival whistle, self-defense whistle, police whistle, kid’s whistle, safety whistle, party favors whistle