Google Nest Protect Wi-Fi Smoke & Carbon Monoxide Alarm (Wired) (S3003LWEF)

Model Number: S3003LWEF
Web Code: 10374122

Google Nest Protect Wi-Fi Smoke & Carbon Monoxide Alarm


For something as important as fire safety, you want a smoke alarm you can trust and rely on. That's what you get with the wired Google Nest Protect. This advanced smart device can distinguish between levels of urgency in smoke and CO levels, and sends you alerts on your smartphone immediately upon detection so you can take action right away.
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For something as important as fire safety, you want a smoke alarm you can trust and rely on. That's what you get with the wired Google Nest Protect. This advanced smart device can distinguish between levels of urgency in smoke and CO levels, and sends you alerts on your smartphone immediately upon detection so you can take action right away.

Ever since you found out what happened at your neighbour's place up the street, you've been thinking about upgrading your smoke alarm system. All you heard was that he narrowly avoided a serious fire, and that it was all because he'd installed a smart smoke alarm called Google Nest Protect.

You go over to his place to find out more about it. Turns out he'd forgotten to switch off the stove and then stepped out to go to the beach. 20 minutes later he got an alert on his phone via the Nest app, telling him that his Nest Protect alarm had detected smoke in the kitchen. He dropped everything and raced home in time to diffuse the situation.

Crazy story, awesome device, you think to yourself. Apparently there's a lot more to the Google Nest Protect than that, though, as your neighbor starts listing off all the cool features:

What you need to know:

  • Smart detection, quick action: Google Nest Protect knows the difference between a concern and a full-on emergency and will alert you accordingly. If it detects a little bit of smoke or rising levels of CO, it gives you a heads-up. If it gets worse, it flashes red, activates the alarm, and talks to you, letting you know exactly what's going on.
  • Convenient connectivity: This device connects with your smartphone and will notify you the moment it senses something out of the ordinary at home. It'll tell you if the alarm is sounding, batteries are running low, or a sensor is malfunctioning, giving you peace of mind while you're away from home. WiFi connection with internet access and compatible phone or tablet with the free Nest app and Bluetooth 4.0.
  • Informative, not annoying: Got an alert on your phone but turns out you simply burned the toast? No worries. You can easily hush the alarm from your phone using the Nest app, simple as that. What's more, the Steam Check feature ensures the alarm doesn't go off simply because of a hot shower.
  • Split-Spectrum Sensor: This feature can conveniently detect both fast and slow-burning fires, and also sports a 10-year CO sensor to detect and pinpoint the toxic, invisible presence of CO. Your device will then speak up and let you know exactly what and where the issue is.
  • Battery backup: This model Google Nest Protect connects to your home's wiring for power, and includes a battery backup for power outages.
  • Considerate battery monitoring: Nobody likes getting woken up in the middle of the night to the sound of a low-battery chirp. That won't happen with Google Nest Protect. When you turn the lights out to go to bed, the Nightly Promise feature emits a green glow to let you know everything's alright for the night.
  • Easy to install: Setting up Google Nest Protect to work with your smartphone can be done in a matter of minutes. Once you link up all your Google Nest Protect devices to your WiFi network, they automatically connect with each other so they're all on the same page.
  • Connected safety inspections: The Safety Checkup feature makes it a breeze to test your alarms. With a simple tap, you can check all your alarms at once to make sure everything's okay. You'll get a full report on your devices once the test is done.
  • Convenient voice controls: Works with Google Assistant for convenient voice controls.
  • Google Nest Thermostat and Google Nest Cam compatibility: If you've got the Google Nest Thermostat and Google Nest Cam as well, you'll appreciate an even safer connected experience. When the alarm sounds, Google Nest Thermostat turns off the furnace as an added safety measure, while Google Nest Cam records what's happening so you can review it later.
Control Type
Smart Smoke and CO Detector
Alarm/Sensor Type
Smoke and Carbon Monoxide Detectors
Temperature Sensor
Smoke/CO2 Sensor
Operating environment


Works with Google Assistant
Device Compatibility
Android; iOS
System Requirements
Wi-Fi connection; Phone or Tablet with iOS 8 or Later; Android 4 or Later; Free Nest Account


Nest App
Control Panel Included
Remote Control Included
Wi-Fi; Bluetooth
Wireless Standard
Working Wi-Fi connection: 802.11b/g/n @ 2.4 GHz; Wireless Interconnect: 802.15.4 @ 2.4 GHz Bluetooth Low Energy (BLE)


Power Source
Wired 120V with backup battery


Security Alarms
Siren Included
Alarm Sound Level
85 dB
EN-14604 Smoke Alarm Devices; EN-50291 - Electrical Apparatus for the Detection of Carbon Monoxide in Domestic Premises; EN-50271:2010, Electrical Apparatus for the Detection and Measurement of Vombustible Hases, Toxic Gases Or Oxygen; EN-50292 Electrical Apparatus for the Detection of Carbon Monoxide in Domestic Premises.


16.7 cm
16.7 cm
8.2 cm
Width (Inches)
6.5 in
Height (Inches)
3.2 in
Depth (Inches)
6.5 in
0.8 kg


Manufacturer's Warranty - Parts
1 Year
  • Device
  • Batteries
  • Wall Plate
  • Screws
  • 120V Connector
  • Wire Nuts
  • Welcome Guide
  • User's Guide
  • Warranty

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Rating Breakdown











Reviewer Recommendation


Of the 3952 reviewers who responded, 3870 would recommend this product.

Key Considerations

Averages based on how reviewers feel this product performs.

Ease of Use:


  • Excellent Product
    Reviewed by Mehyuen - January 2, 2017

    This is such a well-conceived product. Packaging and accessories provided are top notch and nothing is overlooked or cheap. The price is reasonable considering one can spend more than the suggested price for a separate Smoke alarm and Carbon Monoxide detector. Real life experience. My spouse was cooking and forgot to turn on the exhaust kitchen fan. I received a message alert on my phone that smoke was detected in the kitchen. The Nest spoke a very audible message that informed my spouse that smoke was detected and an Alarm would sound shortly. Amazing pre-emptive service allowing us to take of the situation before the "false" alarms were set off.

    Helpful (3)

    Not helpful (0)


  • Nest Protect
    Reviewed by Yumi - January 3, 2020

    I have installed 2 of this one in the hallway and one in the basement. Installation is quite easy took me 10-15 mins per unit. I installed it where my wired detectors were. Just remember if you are installing multiple units. Setup the nest protect first on your app. Add and label them accordingly. Close your main power. Install them all. Turn on your power. Wait for a couple of minutes till your internet is on. Then press any of the units you installed. It would test all units at the same time. What I have noticed is that it tests connectivity to everything every several minutes which makes me feel safe. I like the path lighting at night. And the alarm noise is quite loud. So far i love it.

    Helpful (4)

    Not helpful (0)


  • Trust is EVERYTHING!
    Reviewed by Mark F. - February 25, 2018

    I absolutely LOVE my Nest Protect detectors! But more importantly, I genuinely TRUST them to protect the most important and precious thing in my wife (though I guess my house is kind of important too). From the moment I held the box, through every step, to that moment when I completed the setup, saw the green light, and heard a reassuring voice tell me everything was working properly, I was impressed! This is a very solid and well built product, and appears to have been extremely well thought out and designed. I look forward to enjoying it (and trusting it) until it's time to replace it...with another Nest Protect, of course!

    Review originally posted on Google LLC

    Yes, I would recommend this to a friend.

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Product Category
Smart home products
Return/Exchange Period
30 days