Features: Make from Metal, this portable whistles is light weight and builted to last. Its small size makes it easy to carry. It can 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 Emergencies assistance, this whistles will be your reliable companion. Its louds sound can attract attention and help rescuers locate you quickly, ensuring your safety in critical situations. It can used in a variety of occasion, including camping, hiking, hunting, mountaineering and other outdoor sports activity. Also suitable for referees, lifeguards, dog training. Specifications: Materials: Metal Size: about 6.8x0.9cm/2.68x0.35inch Package Includes: 12Pcs Outdoor Emergencies Whistle note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.