Echo and Google Home
Echo and Google Home

The first step is easiest, but also severely hampers Echo’s usefulness. You can turn off voice input via the mute button on top of the Echo

It’s not going to stop a determined voice hacker, but it’ll work for commercials.

you can change the wake word from Alexa to one of four different options: head into the Settings section of the Alexa app, tap your device, then choose Wake Words.