The V29 Whistle

The Famous V29 Whistle, Over 188 Decibel's

I've tested this whistle and it is very loud. For printing, I would recommend 100% infill, but it doesn't matter that much, as long as you use some infill. This iconic whistle, created by Jzisa, is so loud that you can even use it when you are lost in a remote location and wish to signal for help to anyone nearby.