S3000BWEF Nest Protect Alarm (Battery) 2nd Gen WhiteNest Protect has been redesigned from the inside out. It has a SplitSpectrum Sensor, tests itself automatically and lasts up to a decade. Its also the first home alarm you can hush from your phone without any extra hardware required. And it tells you whats wrong and can even alert your phone. The smoke alarm that other alarms look up to. Nest Protect has a friendly human voice that gives you an early warning. That way you can jandle burning toast