Nest Protect 2nd Generation Smoke + Carbon Monoxide Alarm review
Test scoreShow Context
- Smoke alarm
- Battery/Mains
- Smart optical smoke alarm
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. Launched back in 2017, it sounds as a traditional smoke alarm would do, while also sounding an alarm through your smartphone. But does it do a good job of detecting smoke and how quickly does it sound the alarm? We tested it to find out, so read on for our full review.
- Pros and cons
First reviewed by Which?
June 2017
Technical specifications
Test results
The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.
Find out how we test smoke alarmsPut us to the test
Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.
Compare retailers
Prices updated dailyPrices are ordered from lowest to highest, irrespective of retailer rating or stock, and exclude any potential delivery costs. We are not able to show every possible retailer and cheaper prices may be available. When you click on a retailer link on our site, we may earn affiliate commission. This supports our not-for-profit mission to empower consumers and in no way affects our recommendations. Find out more.
Make smarter choices
- 0%Lowest score
- 43%Average score
- 93%Highest score
Put us to the test
Our Test Labs compare features and prices on a range of products. Try Which? to unlock our reviews. You'll instantly be able to compare our test scores, so you can make sure you don't get stuck with a Don't Buy.
Suggested alternatives
Related articles
How to buy the best smoke alarms
Buying or replacing smoke alarms? We reveal what you need to consider for fire safety, and which fire alarms or smoke detectors are most suitable for your home
How to place and maintain smoke alarms
Which? expert advice on where to put your smoke alarm, which type to buy, plus vital information on what you need to know about maintaining a smoke alarm.
How we test smoke alarms and heat alarms
Which? tests smoke alarms to find which alarms will alert your family to every type of house fire, and which smoke alarms you can't trust to keep you safe.