Features: Double tube survival whistle can provide up to 120db, enough be hear at long distances. Make from Titaniums alloy materials, features high strength and is corrosion-resistant. Integrated designs, it can work even if there is water and dust. Each whistle have hanging hole. You can tie it on your backpacks, key, or neck. The whistle is very light and small. Loud safety whistle for the shrills whistle for any type of outdoor activity such as camping, hunting, hiking, fishing and can also be used for dog training. Specifications: Materials: Titaniums alloy Styles: Stone Wash/Sandblasting/Blue Silver Color/Blue Color Gold Size: about 53x18x9.5mm/2.09x0.71x0.37inch Package Includes: 1pc Double Tube 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.