Must have survival: whistle with high-precision compass and thermometer to grasp current temperature and direction for the first time; When there is no fire in nature, you can use the fire magnifying glass attached to the survival whistle to refract sunlight in grass and fallen leaves to create fire. Light signal: Safety whistle with survival glasses and high brightness LED flashlight. If a whistle cannot be used, use the reflected sun principle for search and rescue personnel to interpret their current position; emergency lighting system and LED bulbs have a lifespan of 10,000 hours when there is no light at the scene Super Loud: Standard high decibel survival whistle, loud sound at high frequency, can deliver up to 120 decibels of sound, in an emergency, you and your whistle will be easily detected. HIGH QUALITY: The emergency whistle is made of high strength, drop and high temperature ABS engineering material, lightweight and stylish, with excellent air circulation design. Comes with a lanyard so you can tie it around your backpack, belt or neck. Storage box: you can put your own lifebuoy in it before traveling: write your name, address, telephone number, blood type, etc. This way, rescuers can catch your case for the first time