top of page
Nest Smoke Alarms

NEST Protect Smoke & CO2 Alarm

Thinks, before it speaks.

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.

Tells you where the danger is.

And when one speaks, they all speak. So the alarm in your bedroom can tell you there’s smoke downstairs.

Tests itself

You’re supposed to test smoke alarms monthly. But 9 out of 10 people don’t. So 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.

It’s time to expect more from your smoke alarm.

Nest Smoke & CO2 Detector

Lights your way

If you need a glass of milk in the middle of the night, the new Nest Protect lights up as you walk underneath it. Pathlight is one of our customers’ favourite features so we made it better and brighter.

Steam is not smoke

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

R.Askew Electrical & Security Ltd are qualified to install all your NEST Security products. Give us a call on 01144 183 362 and we can answer any of your questions and advise on what products would work best for your home. 

Call us now, your local Nest Pro Installer to see if Nest is compatible for your home.

Watch the video for more information on how the Nest Protect Smoke and CO2 Alarm. Protecting your family and home.

Nest Protect Shefield

App Silence

Hush alarms with your phone, not your dish towel. If everything’s under control and there’s only a little smoke, quiet down the alarm from the Nest app.

Phone alerts

Everyone in your family can know what’s going on, from anywhere. When something’s wrong, Nest Protect sends everyone an alert in case no one’s home.

No chirps

Tired of getting woken up at 2am by your smoke alarm? Long before it has to chirp, Nest Protect tells you its batteries are running low with a message on your phone. And don’t worry, that won’t happen for years.

Safety Checkup

Test all your alarms with a tap. And once the test is done, you’ll get a full report.

Family Accounts

Everyone in the family can have their own Nest Account. No more sharing a login. You can all use your phone to hush and test alarms. And you’ll all get alerts on your phone if something’s wrong at home.

Thoughtful not annoying

Nest Protect Smoke & CO2 Alarm
- The Tech Specs



Six long-life AA Energizer® Ultimate Lithium batteries


120V Connector

Three long-life AA Energizer® Ultimate Lithium backup batteries




  • Voice alarms with custom location

  • Phone alerts include:

    • Low-battery

    • Smoke

    • Carbon monoxide

    • Sensor failure

  • Split-Spectrum Sensor

  • Nest App

  • App Silence

  • Detects carbon monoxide

  • Heads-Up alerts

  • 10-year product lifetime

  • Sound Check

  • Nightly Promise

  • Self Test

  • Pathlight

  • Steam Check

  • Wireless Interconnect

  • Safety History

  • What To Do

  • Home Report

  • Emergency Shutoff with Nest Learning Thermostat

  • Emergency clip record with Nest Cam


  • Pre-installed languages by country

  • United States: English, Spanish

  • Canada: English, French (Québécois)

  • United Kingdom: English (British)

  • France, Belgium and Netherlands: French and Dutch

  • Note: After setup, you can change the language Nest Protect speaks to any of the above languages.


  • Split-Spectrum Sensor, 450nm and 880nm wavelength

  • 10 year electrochemical carbon monoxide sensor

  • Heat sensor, ± 1.8ºF (± 1ºC)

  • Humidity sensor, ± 3%RH

  • Occupancy sensor, 120º field of view to 20 feet

  • Ambient light sensor, 1-100k Lux Dynamic Range

  • Omnidirectional microphone, 70dBA SNR

Speaker, horn and light ring

  • 2 Watt Speaker

  • Horn: 85dB SPL at 10 feet (3 m)

  • RGB color ring with 6 LEDs

Size and Weight

  • Height: 5.3 inches (13.5 cm)

  • Width: 5.3 inches (13.5 cm)

  • Depth: 1.5 inches (3.85 cm)

  • Mass: 13.9 ounces (379 g)

  • Height: 5.3 inches (13.5 cm)

  • Width: 5.3 inches (13.5 cm)

  • Depth: 1.5 inches (3.85 cm)

  • Mass: 13.2 ounces (375 g)

Nest Protect, Security, Sheffeld

Connectivity requirements

  • Wi-Fi connection

  • Phone or tablet with iOS 8 or later, or Android 4 or later

  • Free Nest Account


  • Working Wi-Fi connection: 802.11b/g/n @ 2.4GHz

  • Wireless Interconnect: 802.15.4 @ 2.4GHz

  • Bluetooth Low Energy (BLE)

Nest Protect complies with all of the following smoke and carbon monoxide alarm standards:

  • UL 2034 - “Single and Multi Station Carbon Monoxide Alarms”

  • UL 217 - “Single and Multi Station Smoke Alarms”

  • NFPA-72 - “National Fire Alarm and Signaling Code”

Operating Temperature

  • The alarm should not be installed in locations where the normal ambient temperature is below 40ºF (4ºC) or exceeds 100ºF (38ºC).
    Humidity range: 20%RH to 80%RH (non condensing).


  • 2-year limited warranty. For support, visit

  • Our support team is also available by phone 24/7.

In the box

  • Nest Protect (Battery)

  • Six long-life batteries (Energizer® Ultimate Lithium "L91" AA)

  • Backplate

  • Four screws

  • User's Guide

  • Welcome Guide

  • 2-year limited hardware warranty

  • Nest Protect (Wired 120V)

  • Three long-life backup batteries (Energizer® Ultimate Lithium "L91" AA)

  • 120V AC connector

  • Three wire nuts

  • Backplate

  • Four screws

  • User's Guide

  • Welcome Guide

  • 2-year limited hardware warranty

A Nest home.

When you add more Nest products to your home, they can automatically work together.
And you can control them all from one place: the Nest app.

bottom of page