Description: Different from other similar products, our high-decibel whistle can effectively attract attention. It features a bold, crisp sound that requires less breath than traditional whistles. Great for backpacking, hiking, camping and other outdoor activities. Our 7-in-1 whistle has many functions, such as compass, thermometer, reflective signal mirror, magnifying glass, LED light and storage tank. It is constructed of plastic material. The length of this product is 11cm. This product is perfectly suitable for backpacking, hiking, camping, outdoor, etc. Item Name: Safety Whistle Material: Plastic Battery: Button Battery(Battery Included) Features: Lightweight, Compact, Portable, Reusable Size Details: Length: 11cm/4.33"(Approx.) Notes: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Functions: 1. Standard high-decibel survival whistle 2. North/South Compass (high accuracy, clear at a glance) 3. High precision thermometer (Faster and more accurate to grasp the current temperature at the first time) 4. Survival reflective signal mirror (Use the principle of sunlight reflection to explain your current location to those who come forward to search and rescue) 5. Magnifying glass 6. High white light LED flashlight (Under the premise that there is no light in the field, the emergency lighting system and LED bulb have a lifespan of 10,000 hours) 7. storage tank (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 grasp your situation at the first time) Package Includes: 1 x Safety Whistle