If you've just installed your Ring Video Doorbell Pro and now there's white circle blinking on the front of the device, it is not yet fully charged.
Once the internal power cell is fully charged, the white circle will stop blinking and the device will move into setup mode. You will have to wait until the charging process is complete before continuing with setup.
After Ring Video Doorbell Pro is set up, it can take up to an hour for it to be fully charged.