Nest Protect: 2nd Gen Smoke + CO Alarm


At a glance

Know more, worry less

You’ll know, from anywhere

Nest Protect can alert your phone if something’s wrong at home.¹

It looks for both fast- and slow-burning fires

The Split-Spectrum Sensor uses two wave lengths of light to detect smoke.

Silence your alarm from your phone

Barely burned the popcorn? Get a friendly Heads-Up that you can silence using the Nest app.¹

It tells you if it’s smoke or carbon monoxide

When something’s wrong, Nest Protect speaks up to tell you what’s wrong and where the danger is. Speaks to you with words and colours. Tells you what’s wrong and where the problem is.

Works with your Nest Learning Thermostat and Nest Cam

If Nest Protect sounds the alarm, it tells your Nest Learning Thermostat to turn off the boiler. It’s the most common source of carbon monoxide leaks and can spread smoke around the house if there’s a fire. 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
2-year limited hardware warranty
Six long-life batteries (Battery model)
Three long-life backup batteries (Wired model)
AC 230 V connector (Wired model)


Wi-Fi connection.
Phone or tablet with iOS 8 or later, or Android 4.1 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.