●【LOUD VOLUME】Classic design with built-in natural cork ball for loud and crisp sound. Volume near the exhaust outlet (within 3.9 inches (10 cm)) may reach 130+dB ●【Superior Quality】304 stainless steel and electroplating technology for safety and corrosion resistance ●(Attractive Appearance) With the benefit of exquisite electroplating, every whistle has different gradual colors to blend with a unique look ●(Excellent Portability) Small and lightweight, it is convenient to put in your hand or pocket, or hang it on your neck with a neck strap ●【Reliable Utility】Can be used for sports games and emergencies. Perfect for sports referees, coaches, teachers, lifeguards, leaders, campers, and anyone else that may need to get noticed