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The Google Nest Protect smoke and CO alarm looks for fast-burning fires, smoldering fires and carbon monoxide. It tells you where the danger is and alerts your phone in case you’re not home.

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Know more, worry less.

Google Nest Protect looks for fast-burning fires, smoldering fires and carbon monoxide. When it senses smoke or CO, it will send an alert to your phone, so you know something is wrong even when you’re away from home.

Thinks, speaks and alerts your phone.

The Nest Protect smoke and carbon monoxide alarm speaks in human voice and alerts your phone if something's wrong. And if you just burned the toast, you can easily silence it from your phone.

The Details

Product Features

Thoughtful, Not Annoying

You’re supposed to test smoke alarms monthly. But 9 out of 10 people don’t. Nest Protect checks its batteries and sensors over 400 times a day. And it’s the first alarm that uses Sound Check to quietly test its speaker and horn once a month.

Lights Your Way

Need a glass of water in the middle of the night? Nest Protect lights up when walk underneath it. Pathlight is one of our customers’ favorite features, so we made it better and brighter.

Steam is Not Smoke

Has your alarm ever gone off for taking a shower? Nest Protect is the only alarm with Steam Check. It uses custom algorithms and a humidity sensor for steam, so you can enjoy a nice, hot shower.

Product Specifications


Length: 5.3 in (13.4 cm)
Width: 1.5 in (3.85 cm)
Height: 5.3 in (13.4 cm)


Split‑spectrum smoke sensor
10-year electrochemical carbon monoxide sensor


Wired model
3 long-life backup AA batteries
Battery model
6 long-life AA batteries


802.11b/g/n (2.4GHz) Wifi

Operating Temperature

40°F (4°C) to 100°F (38°C)


80dB at 3 ft (1 m) at 1kHz


85dB SPL at 10 ft (3 m)


Nest Protect has been tested to comply with safety standards UL 2034, UL 217, and NFPA-72 set out by UL and the California State Fire Marshall

External Buttons

RGB color ring with 6 LEDs


Comes with 2-year limited warranty (details in box)

What's In The Box

Nest Protect 2nd generation smoke and CO alarm
Four screws
User’s guide
Welcome guide
Six long-life AA batteries (battery model)
Three long-life backup AA batteries (wired model)
120V AC connector (wired model)
Three wire nuts (wired model)


WiFi connection with internet access
Phone or tablet with iOS 8, Android 4 or later
Free Google Nest account

Part Number


1 Mobile alerts require working internet and Wi-Fi.