Product Name: Seven-in-One Whistle Color: Orange.Gray Button cell batteries: 2 pieces of CR1220 Weight: 53 grams including packaging Product dimensions: 109*45*26mm Single white box size: 12*6.2*3cm Packing: 200 Box dimensions: 36*27*69cm Gross weight: 13kg LED light + compass + magnifying glass + reflector + thermometer + sealed compartment Function Introduction: 1. Standard high-decibel survival whistle 2. Compass High accuracy, clear and easy to understand 3. High-temperature thermometer Faster and more accurate time measurement of the current temperature 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 absence of a source of fire in the wild, one can use the principle of focusing a magnifying glass to refract sunlight onto dry grass and leaves to create a flame. 6. High-brightness white 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. Storage tank Before traveling, you can place your own emergency note inside: write down your name, address, phone number, blood type, etc., so that rescue personnel can quickly understand your situation