If you've just installed a Ring Video Doorbell Pro and now there's a blue LED blinking and a slowly filling-in the circle on the front of the Ring Video Doorbell Pro, the blue circle you see on the front of your Ring Pro is a charging meter. Once the internal power cell is fully charged the blue circle will turn off and the device will move into Setup mode. You will have to wait until the charging process is complete before continuing with Setup.
After the Ring Video Doorbell is set up. It can take up to an hour for it to be fully charged.