Highly recommended tool for girls&womens living alone. When encountering bad people, a gentle pull or press can make a high sharp sound.Can intimidate bad people Female classmates walk alone in the dark. If suspicious people approach, they can pull out the plug to scare them off and dispel their evil intentions When an elderly person (or jogger) is traveling, if they are lost, they can pull out the metal rod of their personal alarm and sound the alarm to avoid missing