Heres some alarming news: Palo Alto, California-based home tech company Nest Labs is recalling 440,000 of its combination smoke and carbon monoxide alarms because a feature designed for convenience could actually prevent the alarm from going off at all. The Nest Protect Smoke + CO alarms have a motion-detection feature called Nest Wave, wherein waving your arm near the device causes it to temporarily silence its alarm. The problem was, Nest Labs found that Nest Wave wasnt able to tell an intentional arm wave apart from other kinds of movement, so the alarms were silencing themselves without the user realizing they were doing so.
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