130+ dB High-Power Emergency Whistle – 3D Printable Survival Whistle

130+ dB High-Power Emergency Whistle A compact, high-output whistle designed specifically for 3D printing, with an acoustic geometry optimized to generate an extremely loud and penetrating sound. During real-world testing, the whistle achieved sound pressure levels above 130 dB under the tested measurement conditions. Its internal air channel, chamber geometry and outlet were designed to maximize airflow efficiency while keeping the model simple, lightweight and easy to print. Features - 🔊 130…

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