factory wholesale aluminum alloy whistle rescuing whistle whistle survival whistle metal whistle whistle aluminum alloy whistle small size

survival whistle whistle does not have to be used in distress. for example, say hello to the front and back, determine how far it is, determine the direction of the sound source of the other party, etc. .... however, there is a problem in this, that is, sometimes when climbing a mountain, it just rises and blows whistle. when it blows too much, everyone doesn't feel anything. when hearing others blow, they don't want to blow it. they walk their own, at this time, once someone's foot is twisted, or where he needs help, or the new donkey pulled far in the middle meets the intersection and does not know how to go, it was a very anxious thing that no one responded when blowing whistle, because others thought nothing had happened and they were busy working silently and hard, and they didn't have much time to take care of it, like the story of the wolf coming.

symbol description:

short tone (within one second);■ ■ ■ long tone (more than 3 seconds); the interval between whistles in the instruction is 2 to 3 seconds, and the interval between instructions is more than 30 seconds (for example, the interval between repeated sending instructions is more than 30 seconds)

communication (t):■ ■ ■ ■ (a long tone) is used for the voice communication of the team to determine the whistle direction between each other. after receiving the whistle instruction, a representative receives the instruction (similar to the shouting ~~~~~)

set:●● ■ ■ ■ ■ (two short and one long) set in the direction of whistle (same call collection ~~~~ similar)

forward (v):● ■ ■ ■ ■ (1? peach blossom? send out on behalf of the whole team during the break, and send out on behalf of accelerating the progress during the journey (same shouting ~~~~ similar)

front team waiting (w):●■ ■ ■ ■ ■ ■ ■ (one short and two long) is used for the long distance of the team, and the front team is required to wait for the back team (please wait for ~~~ wait for ~~~ similar)

support required:●● ● (three short) send out when you need help when you encounter difficulties, and the person who receives the signal will reply with a voice (t) to indicate that he will go to support (urgent words! urgent! urgent! similar)

sos:●● ● ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ● ● ● (three short, three long and three short) this is an international general sos code, please remember