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Traditional lifebuoy is only one size. It’s too big for some people, such as girls and childrens. Also, the weak person can’t be effectively protected by traditional lifebuoy. Double Lifebuoy can change size by the extra airbag. The second airbag can avoid drowning again. Double Lifebuoy will give the victim further protection.
Zhi-Xuan Tain Tsung-Ying Wu Yu-Hsuan Cheng