1. Standard high-decibel survival whistle. (The ringing inner chamber makes the whistle longer and louder). 2. Refers to the north (south) needle. (high accuracy, clear at a glance). 3. High thermometer. (Faster and more accurate time to understand the current temperature). 4. Survival reflective signal mirror. (Use the principle of sunlight reflection to explain your current location to those arriving for search and rescue). 5. Tinder magnifying glass. (In the absence of fire in nature, the principle of sunlight focusing on a magnifying glass can be used to refract sunlight on dry grass and leaves to create fire). 6. LED flashlight with high white light. (Under the assumption that there is no strong light in the field, the emergency lighting system and the LED lamp have a life of 10,000 hours). 7. Sealed warehouse. (You can put your own life-saving strip in it before you go out: write your name, address, phone number, blood type, etc. so that the rescuers can understand your situation in time). 8. Nylon. (It is more convenient to carry with you).