Color: Military green Product dimensions: Length 9.7 cm, Diameter 2.8 cm Weight: 50 grams Each box contains 50 pieces Each box contains 300 pieces Outer box dimensions: 52.5*35.5*23 Material: ABS high-strength, impact-resistant, high-temperature resistant engineering material 1. High-decibel survival whistle 2. Compass Accurate, clear, and easy to understand at a glance 3. Thermometer Get the current temperature at once 4. Survival Reflective Signal Mirror Using the principle of sunlight reflection to indicate one's current location to those searching for rescue 5. Fire Magnifying Glass In the wild, when there is no source of fire, you can use the principle of focusing sunlight with a magnifying glass to refract the sunlight onto dry grass and leaves to create a flame. It's better than trying to make fire by rubbing wood together. Hehe 6. White light LED flashlight In the absence of bright light in the wild, the emergency lighting system and LED bulbs have a lifespan of 10,000 hours 7. Sealed compartment Before traveling, you can place your own survival note inside: write down your name, address, phone number, blood type, etc., so that rescue personnel can quickly understand your situation 8. Nylon lanyard Carrying it with you is more convenient [Battery Replacement Method] Take the thing apart and look inside the mirror part in the middle. Behind the LED light, there is a screw that is where you change the button battery.