Is Amazon Echo always listening?

Episode 1457 (1:53:55)

Charmaine from Costa Mesa, CA
Amazon Echo

Charmaine wants to know if she can plug Amazon Echo into a surge protector. Leo says of course! Charmaine also worries that it's always listening. Leo says it is, but it doesn't actively listen unless she says one of four words: Amazon, Echo, Alexa, or Computer. It's only listening for those words. Once it hears the wake word, then it turns on the microphone and sends her request.