ESSENTIAL SURVIVAL: Whistle with high accuracy compass and thermometer, can grasp the current temperature and direction in the first time;When there is no fire in the wild, you can use the fire magnifying glass attached to the survival whistle to refract sunlight onto dead grass and leaves to generate fire. LIGHT SIGNAL: Safety whistle with survival mirror and high white LED flashlight.In the case of not being able to use the whistle, using the principle of sunlight reflection to search for rescue personnel to explain their current position;Under the premise of no light in the field, the emergency lighting system and LED bulb life of 10,000 hours. SUPER LOUD: Standard high decibel survival whistle, high frequency powerful sounder, can provide up to 120 decibels of sound, enough to be heard from a mile away, in an emergency, you and your whistle will be easily detected. HIGH QUALITY: Emergency whistle is made of ABS high strength, fall resistance and high temperature engineering material, light and elegant with excellent airflow design.It comes with a rope, so you can tie it around your backpack, belt or neck. STORAGE TANK: You can put your own lifesaving strip in it before you travel: write your name, address, phone number, blood type, etc. so that rescuers can grasp your situation for the first time.