The circular ring of light ranges from a bright blue tint to a warmer yellow. (theverge.com)
A blue ring of light around the top of the device will blink, and then Alexa will say: (digitaltrends.com)
The green ring of lights on the Xbox controller will rotate around and then the controller will signify which controller it is by lighting up the appropriate quadrant (the wireless receiver will support up to 4 controllers for those rare multiplayer PC games). (howtogeek.com)