Loud whistle!

A very loud whistle! There are many others just like it but this one is mine, so you should use it… There's even a spot to attach to a keychain! It has volumes over 100 decibels and has many uses. For example, a ref/coach could use it to get team member's attention, or anything else you might want a loud whistle for. Disclaimer, you need to blow into it as hard as you can, otherwise no sound will come out at all.