TRENDBOX Multifunctional 7 in 1 Camping Hiking Outdoor Whistle Compass Magnifier LED Flashlight Thermometer Emergency Survival Traveling Contact with peers in the wild, danger, accident needs help. Suitable for outdoor activities, a survival whistle should be equipped for a safety reason. More convenient than other electronic emergency devices if there is no power supply or signals. Lightweight and handy, easy to use and reliable. Using the theory of reflection the magnifier helps you start a fire.