The Nest Protect Smoke + CO Alarm was extensively tested and chosen as the top recommended residential smoke alarm by independent site, The Wirecutter, part of the New York Times Company. Nest Protect was chosen for its advantages in keeping consumers informed: “it does the most to keep your household informed and safe with its full set of safety features, its intuitive app, and voice alerts that tell you where the alarm is sounding and what the problem is.”
The Wirecutter provides recommendations for consumer gadgets and electronics like televisions, routers and mobile phones. The testing was conducted by a journalist with over 6 years of fire service experience and UL engineers were also interviewed. See the below link for extensive details on the testing: