A. The emergency alarm can emit a sound to draw attention to protect you from an accident as far as 606.9 feet away. What’s more, the sounds can last for 50 minutes of continuous alarm. B. This personal alarm comes with 3 AG13/LR44 batteries for longer service life. AG13/LR44 batteries are the secret to this alarm’s painful loudness. They will last up to 365 days before you have to consider replacing them. C. With LED lights, the emergency alarms can be applied to night lighting, suitable for people of all ages, such as students, the elderly, children, women, night workers, etc. You can also use them for traveling, hiking, camping and walking dogs at night. D. The security alarm keychain is portable in size for easy storage and carrying. It can be attached to women's bags, backpacks, school bags, belt loops, suitcases, keys, dog leashes, etc. And you can take it even when you are on the plane. E. The portable personal alarm uses environmental and durable ABS plastic, resistant to falling, crushing and tension and high temperature, and the copper plug, which is not rusty, beautiful and durable, will not break under adverse conditions.