[Features] Can be hung on the backpack, or on the key ring, fashionable and practical!A small whistle can go a long way in communicating with other people in the wild when they need to call for help in case of danger or accident.Outdoor experts suggest that each person should be equipped with two life whistles, carry one with them and store one in a backpack, just in case.

Can be used as outdoor survival, training, distress in the wild, wild rescue survival whistle play a considerable role, of course, we have a better communication equipment instead of whistle, but the role of the whistle is significant, once the modern communication equipment without the power supply, signal shielding area, the military restricted zones and the bearing, the water is in distress, etc., are all time the whistle,Whistle language is rich, no standard and unified has his own reason, such as your guide and other players to encounter the same frequency interference, and can't tell you to another channel, or we found in the search and rescue situation and don't want to be heard, then it's time for editing the whistle language play a role, outsiders do not understand the meaning,This is the function of hidden whistle language.

Note also that even if some people use whistle language, in times of stress or crisis, they forget the rules of use and should pay attention to the death-defying, incessant whistler!

Here is the universal whistle language:

Short note (within one second);■ Long tone (more than 3 seconds);

Whistle interval of 2~3 seconds, interval of more than 30 seconds between instructions (such as repeated instruction interval of more than 30 seconds)

● ● (two short and one long) gather in the direction of the whistle

■ (a short and a long) start, accelerate forward;

● ■ ■ (a short two long) someone left behind, waiting for the front team after the team;

● ● (three short) Ask for help when you are in trouble

(Three short, three long, three short) This is the international SOS code