Product Description 1.140db SAFE SOUND PERSONAL ALARM: The emergency siren can make a loud sound to attract attention, protecting you from emergency situations even at a distance of 606.9 feet. In addition, the sound can last for 50 minutes of continuous piercing alarm. Powered by: This personal alarm clock is equipped with 3 AG13/LR44 batteries for extended life The AG13/LR44 batteries are the secret to this alarm clock's distressing loudness. They last up to 365 days before you need to think about replacing them. 2.Ultra durable and high quality: The portable personal alarm uses high-quality environmentally friendly and durable ABS plastic, anti-drop, anti-pressure and anti-voltage, high temperature resistance, and copper plug, no rust, beautiful and durable, will not be at your worst case damaged 3. Waterproof and Portable - The portable personal alarm uses excellent environmentally friendly and durable ABS plastic, resistant to drops, pressure and voltage, and IP44 waterproof. It can be used normally even if it rains. It is easily portable and can be attached to purses, backpacks, keys, belt loops and more. 4. Simple Control - This alarm clock is easy to operate, pull out the alarm pin. You need to press and hold the button to enter the LED lighting mode, release the button to stop the lighting mode. 5. Committed to bringing you safe and effective self-defense alarm devices. When an emergency occurs, victims can have the opportunity to call for help and use the self-defense siren to protect themselves if needed.