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fesviet0225

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Bo dam la thiet bi di dong cam tay dung de lien lac truc tiep voi nhau trong mot nhom may lam viec. Tac dung cho phep mot nguoi noi va nhieu nguoi nghe dong thoi. Ban kinh dam thoai giua cac thiet bi may bo dam cam tay truc tiep tu 1 den 3km.

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