Best Lifeguard whistle?

Question

I'm a lifeguard and need to blow my whistle several times an hour. I have tried several whistles and they aren't loud or sound really unprofessional. What would be a really loud and easy to blow whistle? Any idea where to buy it? I'm hoping to get it in my hands by the end of the week. I kinda would like a metal but open to plastic.

Answer 1

Tornado 2000