Personal alarms are small, portable devices designed to emit a loud sound when activated. They are often used for personal safety, helping to deter potential attackers or alert others in case of an emergency. Many personal alarms can be easily attached to keychains or bags, making them convenient to carry. These alarms typically work by pulling a pin or pressing a button, producing a sound that can reach up to 130 decibels. Some models also include features like built-in flashlights or emergency lights. Personal alarms are popular among individuals, especially those in urban areas, as a simple way to enhance personal security.