Whistle for survival, with high volume, 5 cm

The first distress signal is often supplied with its own voice, which is not always effective: the voice is not heard at a great distance. You can give signals using lighting products, flashlight, missiles, etc. - This method is more effective in the dark.

The most effective distress signal is the sound of a signal whistle. The whistle does not take up a lot of space, light, it can be fixed on the neck with a lace, and at the same time has a loud, piercing sound. You can use it not only in the forest, but also in the city to attract attention and warn about danger, scare away animals.