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Waste battery recycling is a big problem.Our design aim to use as much as possible the remaining battery power as much as possible.Different cell slots are used to store different types of batteries.Traditional exit signs need to be specifically linked to the independent line, but it also has an emergency power outages.The remaining amount of electricity is stored on the backup battery of the escape warning light,which will save a lot of electricity.Triangle shape design of the central makes us see the escape warning light clearly even when we are in the distance.