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Nest Protect Smoke and CO Sensor - Wired

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Nest Protect Sensor (Mains)

  • Detects Smoke and Carbon monoxide
  • Split-Spectrum Sensor for detecting fast- and slow-burning fires
  • Voice alarms with custom location
  • Silence the alarm from your smartphone
  • Real-time notifications with Nest App
  • 10-year product lifetime
  • Battery backup: Three long-life AA batteries
  • Wired installation: 230 V connector

Nest Protect Smoke and CO Sensor - Wired

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Returns Policy
If you’re not 100% satisfied with your purchase you can return any unused products within 365 days.

If you have problems with a new purchase, our support team will work with you to resolve. And if you still can’t get it working then you can return it within 14 days for replacement or refund.
Support Desk
We provide Life-time Technical Support. You'll always have FREE access to our Technical Knowledgebase, Customer Service and Application Guides as well as all other online resources, help, white papers and articles.

If none of these answer your query you can also raise a ticket and get direct access to our team of smart home specialists for assistance.

Meet the all-new Nest Protect

Nest Protect has been redesigned from the inside out. It has an industrial‐grade smoke sensor, can be silenced from your phone, tests itself automatically and lasts for up to 10 years. It also tells you what's wrong and can even alert your phone.

The smoke alarm other alarms look up to.

Nest Protect is unlike any other smoke alarm. It detects both fast and slow-burning fires, and uses an advanced CO sensor to accurately measure the toxicity in the air. Nest Protect has a voice, too. It speaks up to let you know something's wrong and gives you warnings and instructions in case of emergencies.

Hush the Alarm From Your Phone

Nest Protect is the first alarm you can silence from your phone. Barely burned the popcorn? Get a friendly Heads-Up that you can silence using the Nest app.

Looks after you for up to 10 years.

Nest Protect is an industrial-grade smoke sensor that checks itself over 400 times a day and has been designed to keep you safe and sound for up to a decade.

It reduces false alarms by looking for steam.

Nest Protect uses its humidity sensor and an advanced algorithm to look for steam so that you can enjoy a nice, quiet shower.

Nest Smoke Ring

Nest Smoke- Smart

Safety shouldn't be annoying.

Tired of being jolted awake at 2 a.m. by a low-battery chirp? A green glow when you turn off the lights shows you that everything's OK.

You'll know, from anywhere.

Nest Protect can be controlled right from your smartphone, with the Nest App designed to push notifications whenever something's up.

Nest Smoke Sensor- Smartphone

Catch Nest Protect in Live Action

Nest Protect is the first innovative smoke sensor that thinks, speaks and alerts your smartphone. Want to know how Nest Protect works? Watch the video to see how Nest Protect can make your home smarter and your life simpler.

Quick and Easy Installation

Just check the smoke alarm you have now. If it connects to wires, you'll want Nest Protect (Wired). If it doesn't, you should get the battery-powered Nest Protect (Wireless). No matter which version you buy, installing the Nest Protect is extremely easy. You can set it up in just minutes using your iPhone, iPad, or Android device.

Nest Smoke- Easy Installation

A Nest home.

When you add new Nest products to your home, they automatically work together. You don't have to do any complicated setup. And you can control all of them, at your fingertips, from the Nest App.

Nest Protect+Nest Learning Thermostat
Nest Protect+Nest Camera- Compatible
More Information
Technical Details

Technical Details


  • Split-Spectrum Sensor
  • 10-year electrochemical carbon monoxide sensor
  • Heat sensor, ± 1 ºC (± 1.8 ºF)
  • Humidity sensor, ± 3% RH
  • Occupancy sensor, 120-degree field of view to 20 feet (6 m)
  • Ambient light sensor
  • Omni-directional microphone, 70 dBA SNR

Speaker loudness

  • 80 dB at 1 metre


  • 85 dB at 3 metres

Light ring

  • RGB colour ring with 6 LEDs


  • Three long-life AA Energizer® Ultimate Lithium backup batteries

Connectivity requirements

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


  • Out of the box
      UK: English (British)
  • Downloadable
      French (FR) and (CA), Dutch, Spanish, English (America)


  • Working Wi-Fi connection:
    • 802.11b/g/n at 2,4Ghz
  • Wireless Interconnect:
    • 802.15.4 at 2,4 GHz
  • Bluetooth Low Energy (BLE)

Operating Temperature

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

Size and Weight (Assembled)

  • Weight: 374 g
  • Height: 13.5 cm
  • Width: 13.5 cm
  • Depth: 3.9 cm


  • 2-year limited warranty For support, visit


  • Nest Protect complies with the following smoke and carbon monoxide alarm standards in Europe: EN-14604, EN-50291, EN-50271:2010, EN-50292.

In the Box

  • Nest Protect
  • Batteries
  • Back plate
  • Four screws
  • User guide
  • Welcome guide
  • AC 230 V connector
  • Three terminal blocks
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