The Energy Sonik Blast with CMG offers superior performance and comfort. This safety whistle is ideal for large indoor stadiums, outdoor arenas, on site disaster management, search & rescue, and life guarding! Advanced science and technology makes the Sonik Blast CMG Safety Pealess Whistle the most efficient whistle in its class! Precise whistle chamber calibration assures pure frequency performance; less effort, crisper sound. Flawless patented pealess whistle emits distinct louder pitch without a lot of effort. Superior clear loud blast can be heard over long distances and intense ambient noise. The Energy Cushioned Mouth Grip provides additional comfort and is perfect for reliably holding the whistle in the mouth in wet conditions.