High-frequency Survival Whistle with Double Cavities.
To gather team members, to call someone, to call for help, to strengthen the security level in outdoor activities, esoecially in emergency.
High strengthen aeronautical aluminum alloy.
Two cavities shaking together make it much louder than an ordinary whistle, and reach 118dB at maximum.
With high frequency of 3-4KHz, voice of the High-frequency Whistle with Double Cavities can go much further.
Using High-frequency Whistle with Double Cavities can help to save at least 30% of your labor than an ordinary one.
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