Echo devices are designed to detect only your chosen wake word (Amazon, Alexa, Computer, or Echo). The device detects wake word by identifying acoustic patterns that match the wake word. Once the word is detected, audio begins streaming to the cloud, including a fraction of a second of audio before the wake word. No audio is stored or sent to the cloud unless the device detects the wake word (or Alexa is activated by pressing a button).
You can setup Echo device by following a few steps. Visit below link you will see the steps and get Alexa app setup with Echo device. So today, know all about Alexa app and
echo setup by visiting here alexa.amazon.com