①. The emergency alarm can emit a sound to draw attention to protect you from an accident as far as 606.9 feet away. ②. The sounds can last for 50 minutes of continuous alarm. ③. This personal alarm comes with 3 AG13/LR44 batteries for a relatively long service life. AG13/LR44 batteries contribute to the alarm's loudness. They can last up to 365 days before replacement may be considered. ④. With LED lights, the emergency alarms can be used for night lighting and are suitable for people of different ages, like students, the elderly, children, women, night workers, etc. They can also be used for traveling, hiking, camping, and walking dogs at night. ⑤. The security alarm keychain is portable in size, making it easy to store and carry. It can be attached to women's bags, backpacks, school bags, belt loops, suitcases, keys, dog leashes, etc., and can be taken on the plane. ⑥. The portable personal alarm uses a certain quality of environmental and durable ABS plastic, which is resistant to falling, crushing, tension, and high temperature. The copper plug is not prone to rusting, looks nice, and is durable, and is less likely to break under adverse conditions.