The BASU eAlarm 120 dB Portable Security Emergency Alarm is a keyring-sized panic alarm that operates on battery power. With a loud 120 dB operating sound rating, this emergency alarm is designed to deter potential attackers and provide a sense of security for the user. The purple color adds a touch of visibility and uniqueness to the device, making it easy to spot in case of emergency situations. Perfect for personal safety and home security, this portable alarm is a reliable self-defense tool that can be easily carried on the go.