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Look ! What a big fire in the picture and this person must save himself at once.
Let us say goodbye to the dangers.
This is an emergency （exit ） indicator with lifesaving function.
When you encounter a fire all of a sudden.
The smoke sensor can perceive the density of smoke.
Switch on automatically.
Wet anti-dust masks will fall out instantly.
It can help you out of danger quickly.
You will get the best help when you are nervous and in panic.