Features: Made from durable Plastic, this portable whistles is lightweight and built to last. The whistle is equipped with a hangings chain, which can be hungs on the necklace or keychain of the backpack. Lightweight and portable, easy to use. 3-hole designs whistle, different blowing methods can produce different sounds, and more recognizable. Its louds sound can attract attention and help rescuers locate you quickly, ensuring your safety in critical situations. Suitable for camping, hiking, hunting, fishing and boatings and other outdoor activities. Specifications: Material: Plastic Size: As Shown In The Picture 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.