High pronunciation in dcibels: : This stainless steel pipe has a double pipe design. The oblique round whistle can improve the efficiency of the whistle. The volume is 80-150 decibels, loud noises can be heard in the distance. In an emergency, you can quickly attract the attention of the crowd anytime, anywhere. .Stainless steel material: : This metal tube is made of food grade 304 stainless steel, which can be placed directly in your mouth, which is safe and environmentally friendly. The tube sound room is not afraid of dust and water, is not easy to rust, and can be used normally even in harsh environments. .With key ring: : This high decibel tube also comes with a keychain. You can tie it with a lanyard or a key and take it with you. The appearance is also very elegant and personalized in terms of aesthetics and function. .Stable riveting process: : The rivets on the pipe not only look good, they also make the pipe more stable and stronger overall and thus have a longer service life and a higher price-performance ratio. .Wide scope of application: : Suitable for survival and emergency situations such as camping, hiking, boating, hunting, fishing and outdoor activities. It can also be used for trainers, referees, sports and herd training, bird training or dog training, or it can also be used as an ornament when not in use. .