Photo: Gregor Halenda

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Guardian Angel
Put an end to annoying false alarms—and the frantic towel flapping that ensues: This carbon monoxide and smoke detector will give you a heads-up warning you can dismiss with a simple wave of your hand. Other genius features: vocal alarms, a colored light that alerts you to different levels of danger and a notification sent to your phone when the batteries run low.
  • Nest Protect: Smoke + Carbon Monoxide Alarm, $99

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