Application
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Not only for disaster prevention, but also for crime prevention.
When you are trapped in a room due to an earthquake or fire, "Help!" "Here! Even if you continue to scream it and it will drain your strength.
But with a simple rescue whistle, you can know where you are without wasting energy.
In addition, it can be used not only during disaster situations, but also for crime
For example, if you are in pursuing a suspicious person, you may be able to evacuate the suspicious person loud, while evacuating another location.
It also makes a loud sound when you smoke, so it can be used by children and elderly with small lung capacity.