It's a whistle

I needed a whistle for refereeing. This is the standard and it works.

Don't buy it. Not worth the money.

The whistle physically works, but you can barely hear it in a game when you yourself are triggering it at the loudest level. It's not worth the money, and honestly the only reason I bought it was because we're in a pandemic. At least I can write this off on my taxes.

Works real well

Works really well. I sweat a lot and this thing is soaked afterwards but it doesn't get to my visor at all.

Works better than the hockey spit stuff so far.

It's worked really well so far in the limited use on my bubble and my visor