●可用於登山、露營、野外求生、日常生活防備，達到呼叫同伴及求援的目的。●預防地震失聯、婦幼長者防狼防搶、緊急求助。●配戴鑰匙扣，便於隨身攜帶。音頻高波長短遇到硬質結構體(岩石、水泥)反射速率較快，適合在山間及有大型障礙物的地方使用安全哨聲野外求生、日常生活防備達到呼叫同伴及求援的目的 鋁合金材質不易退色防水耐用鑰匙扣環方便隨身攜帶 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