1. Emergency sirens can emit sounds to attract attention and protect you from accidents up to 606.9 feet away. In addition, the sound can provide continuous alarm for 50 minutes. 2. This personal alarm is equipped with 3 AG13/LR44 batteries, offering a longer service life! The AG13/LR44 batteries are the secret to the alarm's extremely loud sound. They can be used for up to 365 days before you need to consider replacing them. 3. With the LED light, the emergency siren can be used for night - time lighting and is suitable for people of all ages, such as students, the elderly, children, women, night - shift workers, etc.; you can also use it when traveling at night, hiking, camping, and walking your dog. 4. The safety alarm keychain is portable in size, easy to store and carry; it can be hung on ladies' bags, backpacks, schoolbags, belt loops, suitcases, keys, dog leashes, etc.; you can even carry it on the plane. 5. Ultra - durable and high - quality: The portable personal alarm is made of the highest - quality, environmentally friendly and durable ABS plastic, which is resistant to dropping, pressure, pulling and high temperatures. The non - rusty, beautiful and durable copper plug will not break even under the harshest conditions.