My Google Home isn't the best at figuring out if me (or someone else) actually says "Hey Google" or "OK Google." Sometimes I'll be watching a video where no one says anything remotely similar to those phrases, and the lights on my Home flip on. But I have noticed that most of the time, the lights turn off a split-second later, as the Home actually realizes that no one called for it (presumably once the voice clip is processed by Google's servers).

Amazon appears to be giving Alexa a similar ability, with the introduction of 'Cloud-based wake word verification.'

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