As we know ,about 25000 people were killed in building fire in the world every year .Though firefighters are working so hard ,death is still going on in building fire . Why are there always so many dead? Because ,so far there are not any professional self-rescue instruments provided for the people . So when people are trapped in building fire ,the only thing that they can do is just waiting for the firefighters` rescue . however ,sometimes death always comes before rescue .If there is a professional instrument that can help people to escape from the building fire successfully and safely as soon as possible by themselves , the death in building fire must be reduced greatly . My invention is just a solution to this problem .
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