MULTI-FUNCTION: 7-in-1 multi-function survival whistle contains high-decibel whistle, thermometer, compass, LED light, storage compartment, magnifying glass, reflector function, light and convenient, to meet your various requirements for outdoor adventures HIGH-QUALITY MATERIAL: The shell of the whistle is made of environmentally friendly ABS material, which is high-strength anti-drop, high-temperature resistant, sturdy and durable, with a size of 10cm*2.9cm, and comes with an adjustable nylon lanyard, which is small and easy to carry. EASY TO USE: The multi-function whistle adopts a three-section buckle design, which can be split by rotating, and it is easy to operate. VERSATILE USE: Loud safety whistle for camping, hiking, biking, skiing, any outdoor activity, and also for coaching, coaching, sports, teachers, lifeguards, protection, self-defense.