1,Two different whistle tones selectable by user 2,Easy to use operate by single hand 3,strong loudness same effect as traditional whistle 4.special sesigh metal-tubing to reach 125dB+/-5dB loudness 5.handy&hyginic without blowing the whistle 6.suitable for all sporting events 7.alert for emergency situations where a threart to person exists. 8.Multi-propose use suitable for: referee ,coaches ,traveler ,adventurer ,tour guides ,cheer leaders , lifeguards, teachers, traffic guides ,dog trainer....
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