Item Type: Emergency Survival Function Whistle Weight: 53g/1.9oz Product Material: ABS Battery Capacity: 80mAh (shipped with built in battery) Battery Type: button battery CR1220 Number of Batteries: 2 Package List 1 x Multifunctional Whistle 1Storage Tank: You can put your own survival kit in it before you travel: write your name, address, telephone number, blood type, etc., so that rescuers can get to know your situation in the first place. 2High White LED Flashlight: Under the premise that there is no light in the field, the lighting system and LED bulb for emergency use have a life of 10,000 hours, providing enough light for you. 3Tinder Magnifying Glass: When there is no tinder in the wild, the magnifying glass can be focused on the principle of sunlight to refract sunlight onto dead grass and leaves to produce tinder. 4Survival Reflector Signal Mirror: Using the principle of sunlight reflection to search and rescue personnel to explain their current position, in the critical moment to provide you with help. 5Thermometer and Compass: Faster and more accurate, the first time to grasp the current temperature, but also has a compass, accurate and clear, at a glance, to provide you with accurate time and direction.