140db personal alarm: The emergency siren can emit a loud sound, which can prevent emergencies even within a distance of 600 feet, and the sound can last for 50 minutes. High-intensity power supply: This personal alarm clock is equipped with 3 AG13/LR44 batteries, which can extend the service life! AG13/LR44 batteries are the secret of the painful loudness of this alarm clock. They will last for 365 days before you needto consider replacing them. Multi-function: with LED lights, the emergency alarm can be used for night lighting, suitable for people of all ages, such as students, elderly, children, ladies, night workers, etc.; it can also be used when traveling, hiking, camping and walking atnight . Small and convenient: This security alarm keychain has a portable size, which is easy to store and carry; it can be hung on ladies' bags, backpacks, school bags, belt loops, suitcases, keys, dog belts, etc.; it can also be carried on the plane. Durable and high-quality: portable personal alarm clock is made of high-quality environmentally friendly and durable ABS plastic, which is resistant to fall, pressure, and high temperature. The copper plug is not rusty, beautiful and durable, andwill not destroy your bad conditions.