CHARACTERISTICS: Keychain emergency whistles can emit sound aloud, which can be heard from a long distance. Size : 4.7x0.9 cm in diameter, easy to transport and storage. Easy to hang: Each aluminum whistle equipped with keychain design makes it easy to hang in a cord, a bag or backpack. You get: you get 14 survival whistles in total, and you can share it with your friends and families. Material: The outdoor safety whistle made of lasting and aluminum is and stable, which not be easy to break, fade or run. Broad application:The survival whistle for hiking is also suitable for climbing, boat walks, camping, hiking and rescue. Colour:Multicolor Material:Aluminum alloy Package Contents: 14 * Whistle Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.