Nest—which was recently acquired by Google—pulled its Nest Protect smoke and carbon monoxide detector from sale today and issued a letter from Tony Fadell, the company’s CEO about a serious potential safety issue that arose in testing. Nest is advising existing owners that a feature on the device that allows users to disable the detector with the wave of a hand will be automatically disabled.

During recent laboratory testing of the Nest Protect smoke alarm, we observed a unique combination of circumstances that caused us to question whether the Nest Wave (a feature that enables you to turn off your alarm with a wave of the hand) could be unintentionally activated. This could delay an alarm going off if there was a real fire.

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