Use your Alexa voice remote and mute the microphone on the Alexa device

Alexa devices only store relevant information, but if you would like to make sure it only records you when you speak specifically to it, you can turn off the microphone and only talk to it through the voice remote, which comes with the device. To turn off the microphone, just push the mute button on the device. To use the voice remote, press and hold the talk button until you hear the sound, and then give your command.