High quality: aluminum alloy, ultimate lifeguard, stainless steel, double tube Loud whistle: 120 decibels in case of an emergency and the referee uses the whistle to hear long-distance crisp sounds over long distances Waterproof camping: suitable for all weather, rain, wet weather and excellent air flow designSentence 4. Lightweight design: 27g, key chain or backpack, perfect size, stylish and practical, easy to carry.Sentence 5. Versatility: Safety whistle for any type of camping, hiking, hunting, fishing and boating and other outdoor activities