1With great airflow design, it can easy to whistle and make a loud, clear sound. 2Compact size and portable mode, you can hang it on your bag or the key ring, very convenient to carry. 3The loud whistle can be heard compatible with far distance, suitable compatible with diving, camping, hiking, etc. 4An indispensable accessory compatible with outdoor sports lovers and a unique gift to you friends. 5Available in 3 different colors, you can choose according to your needs.This whistle you can use it when you are in a extreme environment or in a state of emergency that you can use less ef compatible witht to blow the whistle to call compatible with help. Through the polishing and pickling process, which can effectively protect the post, and not easy to scratch and oxidation.This survival signal whistle, great compatible with outdoor sports, such as diving, camping, hiking, etc.Features:1. With great airflow design, it can easy to whistle and make a loud, clear sound.2. Compact size and portable mode, you can hang it on your bag or the key ring, very convenient to carry.3. The loud whistle can be heard compatible with far distance, suitable compatible with diving, camping, hiking, etc.4. An indispensable accessory compatible with outdoor sports lovers and a unique gift to you friends.5. Available in 3 different colors, you can choose according to your needs.Specifications:Condition: 100% NewItem Type: WhistleMaterial: NylonColor: Gray, Yellow and Green, Orange(Optional)Size: Approx. 7 * 2 * 1.5cm / 2.8 * 0.8 * 0.6inchWeight: Approx. 13gPackage Included:1 x Whistle1 x StringNote:The whistle is silent under water and is used compatible with sea rescue. compatible with different monitors, the color may vary slightly, thank you compatible with your understanding.