The survival whistle is not an ordinary whistle. People think that the general whistle can be used as a whistle for survival. This idea is very wrong. A whistle must be able to play the role of a helpless person. The sound it emits must meet a temperature of 3,000 Hz. Why it is 3,000 Hz, because the human ear is very sensitive to the 3,000-Hz sound. So the survival whistle is a whistle capable of emitting a 3,000-Hz sound. Survival whistle does not have to be used when in distress. It can be used as a contact, simple communication and orientation, or where to help, and so on. You can use it to communicate when there is a situation, especially in the summer when the visibility is low in the woods, green gauze, corn fields, and the night. Using the whistle correctly will help you get more protection in outdoor sports. When there is no thing, please do not blow the whistle. Survival whistle use specification symbol description: The mnemonic editor edits the direction for a long period of time (confirmation of position, receipt of instructions); Reproduced from: 21st century RV Familie doll has a blank face,you can draw eyes,lips,nose,eyebrows on the face and you can sew according to your drawing.You can also send us the picture of your drawing and we can sew for you.It likes a mystery box,you don't know what it is until you recieve Familie doll. New Toys,New Toy Doll,New Barbies Toy,New Doll Set Nantong Einsame Familie Toy Technology Co.,Ltd , https://www.einsamefamilies.com
â— short tone (within one second);
â– â– â– Long tone (more than 3 seconds);
The internal voice interval of the command is 2~3 seconds, and the interval between the commands is more than 30 seconds (for example, the interval for repeatedly sending commands requires more than 30 seconds).
Communication (T): â– â– â– (a long tone)
It is used for voice communication of the team to determine the position of the whistle between each other. After receiving the whistling instruction, the representative is sent to receive instructions (similar to the propaganda: Hey ~~~~~, similarly, answer: Hey ~~~~~ )
Collection (U): â— â— â– â– â– (two short and one long)
Collect in the direction of the whistle (similar to shouting: Gathering ~~~~, commonly used at the end of the football match)
Advance(V):â— â– â– â– (One short and one long)
At the time of the break, the representative team is dispatched to send a representative on the road to speed up (similar to the propaganda: departure ~~~ or rushing ah~~~)
Wait before the team (W): â— â– â– â– â– â– â– (a short two long)
When the team travel distance is too long, ask the former team to wait for the team (with the propaganda: Please wait ~~~ etc. ~~~ similar)
Ask for support (S): â— â— â— (three short)
When a difficulty is encountered and a request for help is made, the person who received the signal responds with the communication tone (T) ■■■(a long tone) to indicate that they will go to the support (same as the rush! 急!急!Similar answer: 哎~~~)
SOS: â— â— â— â– â– â– â– â– â– â– â– â– â— â— â— (three short, three long, three short)
This is the international SOS code, please remember it (can be translated as: Urgent! Urgent! Urgent! Save ~ ~ ~ life ~ ~ ~ ah ~ ~ ~ Urgent! Urgent! Urgent!) 
Two short and one long collections are returned to the room (the team gathers in the whistle direction);
One short and one long rush to the battlefield (departure of the team, accelerate forward);
One short and two long waiting for the rear (requires the former team to wait for the team);
Three short whistle for help signal (in some cases please support);
Three short three long three short we are now dangerous (SOS)