auto Flame extinguisher

Yo i just received one of these and put it in my grow tent. Just to make sure, is there anything I need to do before installing it to activate it? I'm assuming it comes ready to go? Thx :)
 
All you need to make it work is FIRE, lol are these the red ones that you screw to the ceiling? I'm thinking of putting one by my fuse box.
 
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