1.Premium Quality Lightweight: Emergency whistle keychain design is perfect for use with house keys or car keys. Made with aluminum alloy, strong and durable, with key chains and lanyard, can be tied to backpack, belt, or hanging around the neck as a whistle necklace.2.Widely Used: This survival whistle is very loud and very suitable for outdoor activities, such as schools, gyms, camping, fishing, hiking, pet training etc. It's also used for communication with companion in remote areas, calling for help in emergency. The whistle can be used not only for hiking, mountain climbing, boating, hunting, fishing, but also for dog training, school sports, coaching, etc.Delivery Quantity: 2pcs, Alloy Dual Frequency Survival WhistlePackage Contents: Only the above package contents, excluding other products.Size: length 55mm x width 15mm x thickness 8mm(Reminder: The size is measured manually, there is a slight error)Color: color random delivery