The 120 dB Fox 40 Sonik Blast® CMG® is the most efficient whistle in its class. The Cushioned Mouth Grip (CMG)’s thermoplastic material provides superior grip and protection for teeth. Distinct, loud and clear sound, heard up to a mile away. Fox 40 pealess whistles have no moving parts, making them resistant to freezing, jamming or deteriorating. This design allows the chambers of the whistle to self-clear when submerged in water. Fox 40 whistles are easy to blow; the harder you blow, the louder the sound. They are flawless, consistent and reliable, producing a 90 – 125 decibel sound that will be heard above ambient noises over great distances.