describe Size: 86*30*20mm Personal Alarm with 130db Security Sound: The emergency alarm can emit a loud and catchy sound to protect you from emergencies even at greater distances. In addition, the sound can last 50 minutes continuously.alarm. 1. High Power: This personal alarm is equipped with 2 AAA AAA batteries for long life.2. Super Durable and High Quality: The portable personal alarm is made of durable and eco-friendly ABS plastic, which is resistant to drops, pressure, voltage, high temperature and copper. Plug, no rust, beautiful and durable, will not be damaged in the worst case 3. Waterproof and Portable - The portable personal alarm is made of high quality durable and eco-friendly ABS plastic, anti-drop, anti-squeeze and anti-pull, IP44 waterproof. It can be used normally even if it is raining. It is easy to carry and can be hung on purses, backpacks, keys, belt loops and more.4. Simple control - this alarm is easy to use, just remove the needle from the alarm. You need to press and hold the button to enter the LED light mode and release it to stop the light mode.5 is committed to providing you with safe and effective self-defense alarms. In an emergency, victims can choose to seek help. Use a self-defense siren to protect yourself when needed.