Nest - Protect 2nd Generation (Battery) Smart Smoke/Carbon Monoxide Alarm - White

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Nest Protect Smoke and Carbon Monoxide Alarm — 2nd Generation (Battery): Nest Protect reliably detects and alerts you to the presence of smoke or carbon monoxide in your home. The alarm speaks to you in a calm, clear, human voice, telling you the location of the danger. It also provides smartphone alerts and battery status updates to help protect your home while you're away.

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    What's Included

    • Protect Smart Smoke/Carbon Monoxide Alarm
    • AA batteries, 120V AC connector, backplate
    • 4 screws, 3 wire nuts
    • Owner's manual

    Ratings & Reviews

    Overall Customer Rating:
    100% of customers would recommend this product to a friend (1348 out of 1355)


    Protect your loved ones and your home

    Detects levels of smoke and carbon monoxide within the home and tests itself automatically.

    Receive clear direction in an emergency

    Alarm speaks to you with a human voice and tells you the location and levels of smoke or carbon monoxide when they are present.

    Send alerts to your smartphone

    Provides battery and sensor status notifications so you're always informed, and safety history so you can see what happened over the last 10 days. You can even silence the alarm from your smartphone.

    Get an early warning signal

    If a cooking mishap leads to a small amount of smoke, Nest Protect will let you know without setting off the full alarm.

    Stay on top of any situation

    Synchronized sensors ensure that when 1 alarm senses danger, every alarm in the house will make you aware of the situation.

    If carbon monoxide is present, Nest Protect links with your Nest Thermostat (sold separately) to automatically turn off your gas furnace.

    Light your path at night

    Pathlight illuminates your way in the dark. Adjust its brightness, leave it on as a nightlight or turn it off from the Nest Protect app.

    Customer rating

    would recommend to a friend

    Expert rating




    • Rating: 5 out of 5 stars

      The wait for gen 2 has paid off!

      • My Best Buy® Elite Plus MemberElite Plus Member

      I was always very interested in the original Nest Protect. I always loved the idea, but didn't feel the cost was justified given the negative reviews and early issues. Although they have been able to gradually improve the Nest Protect through software updates, I figured if I was patient enough, I could wait until they released a whole new hardware refresh. I'm glad I waited! Compared to the Nest Protect 1st gen, this one has an improved smoke chamber (fewer false alarms), smaller physical footprint, App Silence feature (silence alarm through app via Bluetooth), and other hardware improvements that extend the stated lifespan to ten years (up from seven)! All very good improvements. But does it work? Well, my house hasn't done the ultimate test of becoming engulfed in flames yet, but I did do some basic false alarm testing. Steam from a nearby bathroom, and light smoke from a candle, both failed to trip the alarm. So it seems their claims of fewer false alarms are true thus far. *Setup* Getting this set up was very easy. You can really tell they put a lot of work into the presentation and setup. The box is easy to open, and very welcoming with its simplistic and well-designed instructions. Everything in the manual is accompanied by very good pictures to help you along the way. Basically, the steps are: 1) Download app (Android and iOS compatible) and create a free account 2) Open Nest Protect box and remove hardware 3) With app ready to pair device, pull plastic tab from Nest Protect unit to power it on 4) Unit goes through some brief testing where you will be left with absolutely no doubt the alarm works (LOUD!) 5) Unit will pair with your phone so you can enter in wifi network info, after which it will connect to wifi 6) Remove old smoke detector and mounting plate 7) Disconnect old smoke detector wires and reconnect new wires included with Nest Protect 8) Screw in Newst Protect mounting plate and snap in other end of new wires to unit 9) Twist in unit to new mounting plate 10) Finish with another test and make final configuration changes via app. Done! This was the first time I had ever replaced a smoke detector, and I found it very easy. *Mobile App* The app is very well-designed and works well on both my phone and tablet. It also integrates with a ton of other home automation gadgets, which is really cool (Nest Thermostat obviously, Philips Hue bulbs, Skydrop sprinkler controller, and many others). Here's some of the things you can do from the app: - Change mode between Home and Away (not really relevant to CO detector, but good for other devices) - Iniitiate Nest Protect sound test, checkup - Silence alarm - Change Protect location (family room, bedroom, etc, for accurate communication) - Adjust Nest Sense: - - Toggle Pathlight to light your way when you are under Protect at night - - Nightly Promise (Unit self-tests and gives green "OK" light each night) - - Steam Check (reduce false alarms on steam, good for units near bathrooms) - - Heads Up (less loud & annoying pre-alarm warning when rising CO levels detected) - Adjust unit LED brightness (low, medium, high) - Change language (English, English (UK), Spanish, French, French (CA), Netherlands) - View unit status (model, serial, software version, battery status, replace date, last update time, wifi MAC/IP addresses) - Add/remove devices to your account - What To Do (advice on preparing for CO/fire alerts) - Device History (logs on alarms and updates) So overall, the Nest Protect is an expertly-designed device and I love it so far. It has everything I could expect from a smoke/CO detector. Although it would be awesome if it could double as a wireless access point or security camera! I will definitely update this as I get more time with my Nest Protect 2nd gen units, especially if I get false positives, or actual positives. But so far I am loving my Nest Protect.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Preeminent Protection for Your Loved Ones

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite Plus MemberElite Plus Member
      • Top 100 ContributorTop 100 Contributor

      Nest Protect Smart Smoke/Carbon Monoxide Alarm provides the ultimate protection & peace of mind. The intelligent alerts discriminate between steam and smoke. A clear "Heads Up!" pre-alert gently cautions you in situations when close proximity to steam or a little smoke in the kitchen, for example, is about to trigger an alert. You can silence a false alarm using your phone. Multiple units share alerts to all rooms & to your NEST App on your phone, tablet & computer - so you are protected throughout your home! The "Promise" is a ring of green light that illuminates nightly to let you know everything is good. Walk under NEST at night & the ring glows white, forming a pathlight. During Heads Up, it glows yellow. During an emergency, it glows red. NEST Protect self-tests, alerting you first by the phone app that it will sound. Everything is tested: sensors / voice / siren. Tests are dated & are sent to your app. A monthly summary even shows the exact date & time of each test. This is the premiere smoke detector, able to detect CO2 (even produces a completely different sound, for instant identification). NEST Protect senses both fast and slow burning fires. NO CHIRPS!! This advanced Smoke Alarm eliminates all of the hassles of pesky chirps from low batteries, with super long lasting Lithium Batteries included that last years. Battery alerts are through your App & by voice on the Alarm. To set-up, simply scan the QR Code on the back of the NEST & follow the voice instructions. Easiest set-up ever! NEST Protect earns my highest recommendation - no other Smoke / CO2 Alarm even comes close!

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Who knew a smoke detector be so cool

      • Verified PurchaserVerified Purchase
      • My Best Buy® Elite MemberElite Member

      Im the guy that always forgot to change the batteries in his smoke detector. Quite frankly I don't know how long the batteries in my old one were dead, but with the addition of a baby girl to our family I decided to make safety a bit more of a priority. Not only with i now get phone alerts when I need to replace the batteries in my smoke detectors, each talks to each other so if one alarm goes off in the house they all do. But its another feature that i didn't know about that really bumps this to the 5 star review. last week i was cooking up some bacon with breakfast and the kitchen got a little smoky, now normally with the traditional alarms you would have a terribly loud and annoying siren going off. The nest gave me a pleasant warning in the form of a woman voice that told me that smoke was detected in the kitchen and that the alarm would sound soon, giving me a chance to hit the button to silence it and then turn up the fan on the rage hood to help clear the smoke. all of the while the previously mention little one was sound asleep and not startled awake by and unnecessary alarm. in addition the the nest thermostat I have had for several years now, I plan on adding more nest product to my home.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Easy Installation/Integration

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      Very easy installation (battery powered), took my old old old smoke detector down, screwed this one in it's place. I already had the Nest Thermostat, and app, so it was very easy to add the Smoke/CO detector. Pathway light is nice when you get up at night, as it gently lights the hall when it detects motion (this can be turned off if need be). I left the brightness set to medium, but can be adjusted to high, medium, and low. If you have a Nest Thermostat, you can also tell Nest Protect to shut down the furnace if it detects a high carbon monoxide level in the house. We also have a Wink hub for light automation and security in the house. You can set up a robot in the Wink App that will turn on all of the lights if the Nest Protect has a triggered alarm. We are very happy with the Nest Protect, and especially happy with how it easily integrates into our home automation. We only have the one Nest Protect in our house, and have named it "Hallway", if we added more, each would have a different name, and it's my understanding that for instance if the "Laundry Room" Nest Protect were to sound, all of the other Protects would tell me that there is smoke or Carbon Monoxide in the Laundry Room. We will be getting more of these over time! The only thing I would currently want changed with the Nest Protect is to change the Pathway light option to allow for a schedule. The hallway we have the Nest Protect located in is always shaded, so on a cloudy day, every time we walk through the hallway, it actuates the pathway light. I would like to be able to set the Pathway light to only actuate say from Sunset to Sunrise to save the batteries.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Best in class

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      I'll admit it up front, I wanted these as much for the 'WOW' factor as the actual function. And these certainly have a lot of WOW. Installation and setup is very simple. attach wall/ceiling plate to surface and then twist sensor into place. Follow the voice prompts for setup and you're done. Really that easy. Now the features. First and foremost it is an excellent fire/smoke/CO detector. I've only had them set off once and that was while cleaning my oven. The cool thing is that it does not just go off immediately, it gives you a voice warning that there is a detection. So if you're cooking and get a warning you can shut it off via the app before you get the alarm. Second WOW feature, no more low battery chirps. It checks it own status daily without any fuss. It will alert you via app that you need to change batteries. I'm sure if you ignore it long enough it will eventually make noise, but why would you? Third WOW feature is the pathlight. If you get up in the middle of the night it will light up the glow ring on the unit so you can see. I love that feature. It is nice when I walk to the kitchen it turns on a light on the way. Same in the hallway to the bathroom. Sure you can buy a $2 nightlight but it's on all the time and not nearly as cool. These are just the most notable and noticeable features. While most more behind-the-scenes they make this the best in class. I didn't even mention how well it looks. Design is elegant yet it blends seamlessly into the rooms. Brilliant.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Nest is a great start to home automation

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      I would highly recommend NEST to anyone considering home automation. The products (Thermostat and Smoke/CO alarms) are easy to install and set-up. The product itself works great. It has expanded my security. I have two wired regular smoke alarms in my apartment and one CO alarm plugged in near the furnace. I added the NEST smoke/co alarms for added security and push notifications. This way, if I am away (which I am frequently) from my home then I have the peace of mind knowing I will be alerted if there is an issue. This also would give me the capability to call for help even if I wasn't home, and hopefully save my stuff and the neighbors if it got bad. The alarms are also "intelligent" and give you soft warnings with voice if there is just a little bit of smoke (like when cooking) and allow easy silencing. It also sends notifications when the smoke level decreases letting you know the issue has been mitigated. They also act as motion sensors which can help with your thermostat learning and they act as night lights, which is great for moving around at night to go to the bathroom or to get a drink of water. If you aren't sure $100 is worth the price of a smoke/co alarm, ask yourself how much your peace of mind is worth. I think the decision is pretty easy. I would highly recommend these products to expand (not replace) your existing smoke alarms. Fire departments recommend one per bedroom, hallways, and kitchen area to be secure. These additional two smoke/co alarms has allowed me to do this, and I feel like I can sleep better at night.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Sleep restfully-Nest protects you

      • Verified PurchaserVerified Purchase
      • My Best Buy® MemberMember

      My apartment has a wired smoke detector, but no CO2 detector in the unit. The hallway CO2 detectors are no longer functional because the property won't spend the money for the special "Gold" 9 volt battery replacement. Living in the Northeast where windows are closed during the better part of the cold weather months, the concern with CO2 levels is a factor not worth ignoring. The Nest smoke detector/CO2 detector is easy to install. To connect it with your Nest network requires a download of the free Nest app and adding it to your wireless network with a WEP key password. The Nest smoke/CO2 detector has added features of lighting your path, a helpful feature if mounted in a dark hallway, when you approach in low light and also glows green at final lights out to let you know that the batteries are OK and the detector is fully functional. The alarm is loud enough to wake the deepest of sleepers. Also, if you have other Nest products in your wireless network, such as a security camera and other Nest Protect Smoke/CO2 detectors throughout the house, they are all connected. This means that if a Nest Protect mounted in the basement detects smoke or CO2, all the others Nest Protects in the house also sound the alarm, and any Nest security camera on the network is turned on. All settings and personal preferences can be set on the easy to use Nest app. With Nest Protect, I sleep soundly.

      I would recommend this to a friend

    • Rating: 5 out of 5 stars

      Adds peace of mind, easy to check on iPhone

      • My Best Buy® MemberMember

      Currently I have 2 Nest Protect 2nd editions and one more on the way. At first, I was caught up in the difference between the battery and wired edition, but most of what I researched showed that the wired version is essentially obsolete since battery version can sync their signals with WiFi anyway. Overall, I have found these to be great upgrades to old detectors. I was upgrading 10 year old smoke detectors, so I was glad to add the carbon monoxide sensor with the Nest on upgrade. Overall, the app makes it so SIMPLE to check up on the sensors and make sure that everything is online and with full battery. It just adds more reassurance than checking on detectors manually. One extra feature that I like is the path light. I installed one outside of a bathroom, and now the LED glows when getting up in the middle of the night. Apparently the LED is low energy drain, so I will see how it holds up over time. Due to the ease of use and ease of checking these detectors I plan on replacing all of my home detectors eventually. Since I also have the Nest security camera, it all integrates into one app which has always functioned perfectly. Overall I think Nest is probably the way to go for the Smart Home movement as it is reliable, high quality and has never caused me any problems.

      I would recommend this to a friend

    What experts are saying

    Rating: 4 out of 5 stars with 9 reviews

    Click to visit alaTest website
    Using an algorithm based on product age, reviewers ratings history, popularity, product category expertise and other factors, this product gets an alaTest Expert Rating of 81/100 = Very good quality.
    • Tech Advisor (UK)Rating, 4 out of 5Jim Martin on July 3, 2017
      Nest Protect review (2nd gen)
      A review of the 2nd generation Nest Protect, a smart smoke alarm and carbon monoxide detector.Full Review
    • 11, 2017
      Nest Protect 2nd Generation Smoke + Carbon Monoxide Alarm review
      The Nest Protect 2nd Generation Smoke + Carbon Monoxide Alarm is a smart smoke alarm that's two products in one - offering protection against CO and smoke. It sounds as a traditional smoke alarm would do, while also sounding an alarm through yourFull Review
    • The WirecutterJennifer Pattison Tuohy on October 31, 2016
      The Best Smart Smoke Alarm
      A former firefighter tested seven smoke and CO detectors, choosing the Nest Protect for its solid performance, simple networking, and self-testing.Full Review
    • GadgetSpeak (UK)Rating, 4.5 out of 5paul_smart on March 25, 2016
      Nest Protect
      I was invited to a world-wide launch of several products from Nest early last summer. I asked to review this item and was told two weeks despite numerous reminders nothing happened until I assume a new employee arrived now this is protecting me.Full Review
    • Alphr (UK)Rating, 3 out of 5Alan Martin on February 5, 2016
      Nest Protect 2 review: literally a life-saver
      A second connected smoke and carbon monoxide detector arrives from Nest, but is this literal lifesaver worth £89?Full Review
    • EngadgetRating, 4.3 out of 5September 16, 2015
      Nest Protect review (2015): Improved safety makes it easier to recommend
      A pricey, but solid addition to your home. The Nest Protect takes something as boring as detecting smoke and makes it slightly exciting. Updated sensors reduce false alarms and are quicker to determine when there's a problem. The companion app,Full Review
    • CNETRating, 4 out of 5Megan Wollerton on July 27, 2015
      Nest Protect (second generation) review
      Nest Labs apparently loves a good challenge. Its ability to transform boring, utilitarian household products into smart devices beautiful enough to make a design giant like Yves Behar weep (I imagine) is an incredible feat.Full Review
    • CNETRating, 4 out of 5July 27, 2015
      Nest Protect ( Second Generation, Battery, White)
      And yet, Nest's original Protect smoke and carbon monoxide (CO) detector had a big problem. Its 'Wave' feature that literally let you turn off alarms with a gesture was deemed dangerously unreliable after it hit retail, leading to a recall .Full Review

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