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In the wolrd natural disaster-prone areas, like earthquake-prone zones,Japan, Taiwan, disaster often comes suddenly. It is hard to take life-saving equipment any time. When people were buried in the ruins, lifesaving whistle is very necessary. Replace the collar button on daily clothes with a whistle button so that can enhance your survival rate .
Xiaowei Wu，Caixiang Ding，Rufeng Dai，Ziyun Yan，Dunqi Lu，Wenjie Zhang，Dawei Pan，Huanghao Jin，Qionglei Zhu