A personal alarm is a small, portable device designed to emit a loud sound when activated. It is often used for personal safety, allowing individuals to alert others in case of an emergency or to deter potential threats. These alarms can be easily attached to keychains, bags, or worn as accessories, making them convenient for everyday use. Many personal alarms are battery-operated and can produce sounds ranging from 90 to 130 decibels, similar to a car horn. Some models also feature additional functions, such as a flashlight or a panic button, enhancing their effectiveness in various situations.