You will probably see the blue colour most often on your Alexa Echo Dot.
When you say the magic word ("Alexa"....), the ring starts to glow blue. This signals Alexa that she is ready for your request.
The device has multiple great Alexa skills! The blue light is there to keep you and your home safe.
If you’re away for a longer period of time, you can turn on Alexa Guard.
The away mode is a free feature available for supported Amazon Echo devices that can detect the sound of smoke alarms, carbon monoxide alarms, or glass breaking.
The device will then send you alerts via notifications.
But that’s not it! The Amazon Echo has a system of multiple microphones that allows it to pick up the sound of the wake word.
When Alexa hears the word, it begins recording, and you will see a dark blue ring of light on the top.
Alexa Echo Show
As soon as Alexa responds to your voice command (e.g. "Alexa, switch on the light in the living room"), the blue ring starts "wandering" from left to right and flashing.
A rotating blue ring signals: the voice assistant is currently carrying out your voice instruction.
When you use the Amazon Echo Dot for the first time, the ring also flashes blue during the time in which the system is initially set up / started.