The Nest Protect has an industrial-grade smoke sensor, tests itself automatically, and lasts up to a decade. It’s also the first home alarm you can hush from your phone without any extra hardware required. And just like the original Nest Protect, it tells you what’s wrong and can even alert your phone. Nest Protect has a friendly human voice that gives you an early warning. That way you can handle burning toast before it becomes a burning toaster.