1, The standard military high decibel whistle.
2, Referring to the North (South) needle.
3, High precision thermometer
(faster and more accurate grasp the current temperature for the first time)
4, Survival reflective mirror
(using the sun's reflection principle) to search and rescue people who are present.
5, Fire magnifying glass
In the absence of fire in the field, you can use sunlight to focus on the principle of magnifying glass, the sun will be refracted to the grass, leaves on the fire
6, LED flashlight(in the absence of light in the field under the premise of emergency lighting system, LED lamp life of 10000 hours).
7, Sealed warehouse
Before you go on a trip, you can place your own life saving note: write your name, address, phone number, blood type and so on