auto Flame extinguisher

Hey anyone see the new flame extinguishers for grow rooms. They automaticlly go off at 150 degrees i was thinking about getting one. let me add the link. the product is called the flame defender

http://www.youtube.com/watch?v=STjMZz8gxbA

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.