Google Nest Protect Gen 2 Smoke Alarm / Carbon Monoxide Detector, Battery Edition

MX71974 Protect Gen 2 Smoke Alarm / Carbon Monoxide Detector, Battery Edition
MX71974 Protect Gen 2 Smoke Alarm / Carbon Monoxide Detector, Battery Edition MX71974 Protect Gen 2 Smoke Alarm / Carbon Monoxide Detector, Battery Edition

Product Info

Meet the Nest Protect, Battery Edition:

The Smoke Alarm Other Smoke Alarms Look Up To


Nest Protect Gen 2: Redesigned from the inside out
It has a Split‑Spectrum Sensor, that tests itself automatically and lasts up to a decade. It's also the first home alarm you can hush from your phone without any extra hardware required. And it tells you what's wrong and can even alert your phone if you let it.

Nest Protect: The smoke alarm that thinks, speaks and alerts your Phone

The alarm goes off and your mind starts to race...

  • Where's the problem?
  • Is it smoke?
  • Is it CO?
  • Is it Burned Popcorn?

It Thinks, Before It Speaks

"Heads Up, There's Smoke In The Kitchen"

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.


It's on Your Ceiling and on Your Phone

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 2 a.m. 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.

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 password. 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.

Sees Both Fast and Slow Burning Fires

The foam and particle board in much of today's furniture make fires burn faster. Technology should keep up. The Split‑Spectrum Sensor uses two wavelengths of light to detect smoke from both fast-burning and smoldering fires.

10 Year CO Sensor

Carbon monoxide is poisonous but you can't see it or smell it. That's why Nest Protect has the most accurate type of carbon monoxide sensor available. We also improved our carbon monoxide sensing algorithm. And we'll keep working to make it better and better because people depend on it.

Thoughtful, Not Annoying

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.

Lights your way:
If you need a glass of milk in the middle of the night, Nest Protect lights up as you walk underneath it. Pathlight is one of our customers' favorite 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.

Count Sheep, Not Chirps

No one should be woken up by a low-battery chirp at 2 a.m. When you turn off the lights, look for a quick green glow. That's our Nightly Promise. It means all your Nest Protects have tested themselves, the batteries are good, and there won't be any chirps. Sweet dreams.



System Requirements

Although this Nest Smoke Alarm / CO Sensor works better with other Nest Smart Devices, it can work by itself. Either way, it still has these basic requirements:

  • Free Nest Account
  • Wi-Fi Connection w/ Internet Access
  • Compatible Android or iOS Smart Phone or Tablet with Free NEST App


Nest's Products Are Made To Work Together

With Nest Thermostats:
Heating systems can cause carbon monoxide leaks or spread smoke through your home in a fire. In an emergency, Nest Protect tells your Nest Thermostat to turn off the heat to keep the danger from spreading.

With Nest Cams:
If your Nest Protect senses smoke or carbon monoxide, Nest Cam will automatically record and send you a video clip if it’s connected to Wi-Fi. And the entire video will be securely stored in the cloud so you can go back and see what happened.

With Rheem Water Heaters
There are a lot of products that work with Nest. Because gas heaters can be dangerous in a smoke or carbon monoxide emergency, if Nest Protect goes off, your Rheem water heater will turn off.


Make and Model Nest Protect Gen 2 CO Sensor / Smoke Alarm, Battery Powered
Part Number S3000BWEF
Color White
Features 10-year product lifetime
App Silence
Carbon Monoxide
Detects Carbon Monoxide
Emergency clip record with Nest Cam
Emergency Shutoff with Nest Learning Thermostat
Heads-Up alerts
Home Report
Nest App
Nightly Promise
Safety Checkup
Safety History
Self Test
Sensor failure
Sound Check
Split‑Spectrum Sensor
Steam Check
Voice alarms with custom location
What To Do
Wireless Interconnect
Sensors Split‑Spectrum Sensor @ 450nm & 880nm
Electrochemical Carbon Monoxide Sensor w/ 10 Year rating
Heat Sensor w/ ±1.0° C Accuracy
Humidity Sensor w/ ±3% RH Accuracy
Occupancy Sensor w/ 120° FOV, 6m (20 feet) range
Ambient Light Sensor w/ 1 ~ 100,000 Lux Range
Omnidirectional Microphone w/ 70dBA S/N Ratio
Wireless Wi-Fi: iEEE 802.11 b/g/n @ 2.4GHz Wireless Interconnect: iEEE 802.15.4 @ 2.4GHz Bluetooth w/ Low Energy (BLE)
Audio 2 Watt Speaker
Alarm Horn: 85dB SPL @ 3m (~93dB SPL @ 1m)

Omnidirectional Microphone w/ 70dBA S/N Ratio

LED Light Ring Color Ring with 6 RGB LEDs
Temperature Operating: 4 ~ 38° C (40 ~ 100° F)
Humidity Operating: 20 ~ 80% RH (non-condensing)
Safety Standards Nest Protect has been tested to comply with safety standards in the United States as set out by:

California State Fire Marshal

Smoke & CO Standards 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"

Green Status RoHS compliant
REACH compliant
Recyclable Packaging
Power 6x Energizer® Ultimate Lithium AA Long Life Batteries
Dimensions and Weight  
Dimensions (LxWxH) 134 x 134 x 38.5mm
Weight 400g

Package Contents

  • Nest Protect, Battery Edition
  • 6x Energizer® Ultimate Lithium AA Long Life Batteries
  • 1x Backplate
  • 4x Screws
  • User Guide
  • Welcome Guide