Mine intrinsically safe main speaker is a special product speaker for coal mine, metallurgy and mining industries, which is suitable for underground sidewalks, parking lots, lounges and other places. When an accident occurs underground, guide personnel to evacuate and evacuate safely, and provide music and safety knowledge education for underground workers, so as to improve the awareness of coal mine safety production.
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What is this font?
What does the intrinsically safe type mean?
I'm ignorant again.
The first time I heard about mining
Praise
What does 1-10 mean? If it is an emergency, is the reminder too insignificant?
I didn't even see it was a sound box...