Features: Made from titanium alloy, this portable whistles is lightweight and built to last. Its small size makes it easy to carry. It can be hungs on the necklace or keychain of the backpack. Whether you're climbing mountain, camping in the wilderness, explorings new territory, or in need of emergency assistance, this whistles will be your reliable companions. Its louds sound can attract attention and help rescuers locate you quickly, ensuring your safety in critical situations. Its waterproof and moisture proof designs makes it suitable for all kinds of outdoor environment, ensuring its reliability even in harsh conditions. Specifications: Material: Titanium Alloy Size: Approx. 4.8x0.8cm/1.89x0.31inch Package Includes: 1x Emergency Whistles note: Please allow 1-2cm errors due to manual measurement, make sure that you do not mind before you order. Due to the difference between different monitors, the picture may not reflect the actual color of the item.