Description: Equipped with a round key chain ring, this emergency whistle can be attached to a lanyard or key, or to purses and bags, making it easy to carry with you during outdoor activities. It is a good tool for camping, hiking, hunting, climbing, boating and other outdoor sports activities, as this emergency survival whistle makes a loud and bright sound that can be heard from a long distance, allowing others to quickly confirm your location and get a quick rescue. It is constructed of aluminium alloy material. The length of this product is 4.7cm and width is 0.9cm. It is suitable for referees, for coaches, lifeguards, dog training, etc Item Name: Whistles Material: Aluminium Alloy Features: with Keychain, Super Loud, Long Transmission Distance Size Details: L: 4.7cm, W: 0.9cm(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 3 x Whistles Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.