Nest Protect: 2nd Gen Smoke + CO Alarm


At a glance

The next-generation smoke and CO alarm that thinks, speaks and alerts you on your phone.

You’ll know, from anywhere

Nest Protect alerts your phone¹ when something’s wrong at home. You’ll get a message if the alarm goes off, if the batteries start to run low or if a sensor isn’t working.

It tells you what and where the danger is

The new Split-Spectrum Sensor looks for both fast- and slow-burning fires. It also has a 10-year CO sensor so it can tell you where poisonous, invisible CO is hiding. And all your Nest Protects speak up at the same time to tell you what’s wrong and where the problem is.

Silence your alarm from your phone

Just burned the toast? Or left the popcorn in the microwave too long? When there's only a little smoke, you can silence the new Nest Protect using the Nest app.¹

It’s thoughtful, not annoying

Nest Protect tests itself over 400 times a day and you can check the status in the Nest app. It also has Steam Check so a relaxing shower doesn’t cause your alarm to shout at you. And as you walk underneath it at night, Pathlight lights your way.

Works with your Nest Thermostat and Nest Cam

If Nest Protect sounds the alarm, it tells your Nest Thermostat to turn off the heating system, one of the most common sources of carbon monoxide leaks. Your Nest Cam will also record a clip while the alarm is going off so you can see what happened.

More than one colour. To tell you more than one thing.

The Nest Protect light ring can display different colours depending on what’s going on.

What's in the box

Nest Protect: 2nd Gen Smoke + CO Alarm
Four screws
User guide
Welcome guide
Six long-life AA batteries (Battery model)
Three long-life backup AA batteries (Wired model)
120 V AC connector (Wired model)
Three wire nuts (Wired model)


Wi-Fi connection.
Phone or tablet with iOS 8 or later, or Android 4 or later.
Free Nest account.

¹The Nest App is compatible with iOS devices running iOS 8 or later and Android devices running Android 4 or later. A 2.4 GHz Wi-Fi network and Internet connection are required in order to monitor Nest Protect and receive alerts in the Nest app on your smartphone.