Features 1、1. Essential survival tool: The whistle is equipped with a high-precision compass and thermometer, which can grasp the current temperature and direction for the first time. 2、2. Magnifying glass: When the whistle cannot be used, use the principle of sunlight reflection to search for rescuers and explain their current location; when there is no fire in the wild, use the magnifying glass attached to the survival whistle to refract the sunlight onto the grass blades to make a fire. 3、3. High decibel: standard high decibel survival whistle, high-frequency powerful sound generator, can provide up to 120 decibels of sound, enough to hear a mile away, in an emergency, you and your whistle are easy to be found. 4、4. High quality: small and elegant, with excellent airflow design. Comes with a keychain, so you can attach it to a backpack, belt or key. 5、5. Multitool: You will have a set of survival tools that can help you in an emergency. Dimension: 8.1*1.7*1.8CM (length * width * height) Material: ABS high-strength anti-fall and high-temperature engineering plastics Weight: 19g Color: Dark Green Functions: compass, thermometer, magnifying glass, whistle Scope: outdoor sports such as mountaineering, trekking, crossing, etc. and tourism Package List 4*Whistle