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When we are in the dense forest or on the mountain, the cell tower maybe very low and even get fielded totally, we are not able to contact others when there is emergency, which is very dangerous.This design connected one aluminum covered hydrogen ball with the stick, when we need rescue,just get the hydrogen ball out of the stick and inflate the hydrogen, so that the ball will rise and become a line of antenna, to strengthen the signal and make the rescue find our position easily.