The emergency alarm can make a loud sound to attract attention, and the sound can continue for a long period of continuous ear-piercing alarm. The alarm is illuminated with high-intensity light to prevent the bad guys from opening their eyes. The emergency alarm can be used for night lighting, suitable for students, elderly, children, women, night workers and other people of all ages; you can also use them for Night travel, hiking, camping and dogging. The size of the security alarm keychain is easy to carry, easy to store and carry; it can be attached to women's leather bags, backpacks, school bags, belt loops, suitcases, keys, dog leashes, etc.; you can accept it even on an airplane. The portable personal alarm uses high-quality environment and durable ABS plastic, which is resistant to fall, pressure, and high temperature, and the copper plug (not rusty, beautiful and durable) will not destroy most of your adverse conditions.