I ref about 60 basketball games a year.  Yep, 60+.  I've also got tinnitus from these darn whistles.  Still, I love the Fox 40.  Loud - clear- commanding.  I bought these yellow ones to strap to my kid's jackets when we ski.  We like the glades and the bowls, so getting lost or getting hurt is a real thing.  These are loud as can be (did I mention the tinnitus?) and they work when wet (no pea).  Somehow the standard safety whistles you buy for kayaking or hiking always use a pea, which is a problem in wet or dirty conditions (like kayaking or hiking).  These are great and super reliable.