This aluminum alloy keychain whistle is a must-have for any outdoor enthusiast. With its high-frequency dual-tube design, it can emit a powerful sound that can quickly attract rescuers' attention. Its lightweight and durable construction make it good for outdoor use, small size allows for easy carrying and quick access. Whether you're in a survival situation, need to call for help, or want to train your pet, this whistle is a versatile tool that can meet all your needs. Features -Color:Blue -Material:Aluminum Alloy -Size:4.00X1.70X0.90cm/1.57X0.67X0.35in -Wide Application: Versatile whistle set ideal for hiking, hunting, camping, fishing, and kayaking, which ensure you're prepared for any outdoor adventure -Loud Sound: Emergency whistle has a high-pitched sound to attract attention and aid rescue efforts in dangerous situations -Sturdy and Stable: Constructed from sturdy material, anti-wear and practical, designed to withstand harsh environmental conditions -Dual Tube Designed: The whistle has a dual tube designed, which can make a more loud sound -Portable Designed: Compact and lightweight design makes it easy to carry, attachable to keychains or backpacks for convenient access Package list: 1 x Whistle