This is a optimised and extremely loud whistle.

This 3D-printable whistle is the result of a long time tweaking, tuning, and testing. it has sound levels exceeding past 130 dB.

⚠️ Important Notes:

• It requires a bit of air pressure to activate — you don’t need iron lungs, but you do need to give it a proper blow.
• This thing can cause temporary hearing damage. Please use ear protection if needed, and be mindful when using it around others.