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Personal alarms are powerful tools for self-defense that can draw attention to dangerous situations and deter attackers. They're especially popular among women, students, and others seeking nonviolent methods of defense. Personal alarms work best when combined with other safety measures. Regular maintenance, battery testing and inspection will help ensure that your personal alarm will be ready when needed. Safety tips Personal alarms are an effective and nonlethal way to draw attention to yourself in an emergency. Used alongside other