Multifunction:These features of the electronic whistle are helpful in your outdoor adventures. Such as biking, skiing, camping, hiking, backpacking, hunting, archery, fishing, swimming, boating, sea sports and any kind of outdoor activities. The 7 small parts of the whistle are detachable. Whether you need a whistle or another widget, you can use it quickly and easily. High Decibel Whistle:The compass survival whistles for adults can emit a high-decibel whistle that meets the standard military regulations. It is light in weight and has an excellent airflow design, making the whistle farther and harsher. With a north (south) needle, the number of pointers is accurate and clear at a glance, and there is a high-precision thermometer, which can grasp the current temperature faster and more accurately in the first time. LED Outdoor Compass:The survival reflective signal mirror attached to the electronic whistle is to use the principle of sunlight reflection to search and rescue people forward to explain their current location. The biggest feature is the built-in white LED flashlight. Under the premise that there is no light in the wild, it is a The lighting system for emergency use and the LED bulb have a lifespan of 10,000 hours.