Good question, @Bluepiperpete. The LED indicator around the button, on the front of your Video Doorbell, can illuminate for various reasons. It will often depend on recent state, event, or usage during the time of the light. If this occurred during setup, you are likely seeing a successful connection indicator or an update. Pressing the ring button or toggling two way audio from the Ring app can result in a blue light, as can charging the device. I hope this helps! 