Product 1.USB Rechargeable Battery: The personal alarm is made of rechargeable lithium battery instead of coin cell. There is no need to replace the battery, directly use the usb data cable to charge, the charging time only takes 30 minutes, and the standby timeis 1 year. 2.130 decibels Safety Emergency Alarm: The piercing sound attracts the attention of others and even 300 when you are in danger, the distance is very far. Up to 50 minutes of continuous sound to ensure emergency use. It will replace selfdefense weapons to protect your safety like pepper spray3.2 How to use You can pull the contact pin out or quickly press the switch 2 times to activate the alarm4.LED emergency flashlight: The bulb is bigger and brighter than the traditional Flashlight for Security Alarm5. Lightweight and Portable Alarm Keychain: Self Defense Alarm can be attached to purses, backpacks, keys, belt loops and suitcases. It can also be taken on the plane, very convenient, suitable for students, joggers, elderly, children, women, night shift workers.Delivery Quantity: 1