The OnePlus smartphone receives emergency notifications by default, such as child abduction or extreme threats.

If desired, the following notification types can be turned on/off individually:

We can also set the vibration and a ringtone for the emergency alerts.

Android 10 | OxygenOS 10.0
Emergency alerts -  Open the  Settings
Emergency alerts -  Tap on  Apps & notifications
Emergency alerts -  Tap on  Emergency alerts
Emergency alerts -  Enable or disable the desired  option
  1. Open the Settings
  2. Tap on Apps & notifications
  3. Tap on Emergency alerts
  4. Enable or disable the desired option

OnePlus Instructions