Nest protect has been redesigned from the inside out. It has a split-spectrum 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 it tells you what's wrong and can even alert your phone. The foam and particle board in much of today's furniture make fires burn faster. Technology should keep up. The split-spectrum sensor uses two wavelengths of light to detect smoke from both fast-burning and smoldering fires. No one should be woken up by a low battery chirp at 2 AM when you turn off the lights, look for a quick green glow. That's our nightly promise. It means all your Nest protects have tested themselves, the batteries are good and there wont be any chirps. Sweet dreams. In addition to its voice, Nest protect uses colors to communicate. And we gave the new Nest protect a brighter light ring so it's easier to see in an emergency and better at helping you see things in the dark.

nest Smoke and Carbon Monoxide Alarm, Battery Power Source, Accelerometer, Ambient Light, Electrochemical, Humidity, Microphone, Occupancy, Split‑Spectrum, Temperature Sensor, 20 ft Detection, LED RGB Color Ring Visual Indicator Type, Alarm: Horn, 85 dBA Sound Level, 40 to 100 deg F, White, 5.3 in Width, 1-1/2 in Height, 5.3 in Depth

• 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