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Fire exit is one of the most important escape routes in case of fire. However, sometimes the fire break out from the escape stairs. What's more, the temperature outdoors sometimes is not suitable for escaping. In order to keep people away from dangerous escape exit, we designed LIFESAVING EXIT SIGN. It is made of color- changing material and has a wrong cross shape. When the temperature goes higher, the original transparent material will turn red. So with the increasing temperature outdoors, the red wrong cross will indicate it is not the correct escape route.