Features: Engineered with a double frequency, this survival whistled delivers piercing sound for reliability emergencies signaling in outdoor adventures, addressing critical visibility challenges during scenarios. Crafted from light weight, durability plastic with randomized color variations, each whistled combines portability with high visibility distinction for quick identification in group settings. Essential for hikers, campers, disaster preparedness kits, and family outdoor enthusiasts seeking dependable safety gear for high risk environments. Optimized for wilderness expeditions, stormy weather emergencies, and team based activities where audibles alerts prevent equipment confusion and ensures group safety. Its waterproof construction withstands rain, humidity, and extreme temperatures, maintaining functionality as a emergencies tool for adventurers prioritizing various weather reliability. Specifications: Dimension:7×1.7×0.9cm/0.669×2.76×0.354in Component:Plastic Package Includes: 10pcs Emergencies Survival whistled note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.