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Nest Protect 2nd Generation Smoke + Carbon Monoxide Alarm review

£107.99 View retailers

Test scoreShow Context

Key features
  • Smoke alarm
  • Battery/Mains
  • Smart optical smoke alarm
Expert 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. 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.

What's included:
  • Pros and cons
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First reviewed by Which?

June 2017

Test results
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Best Buys and Don't Buys
We have tested 38 smoke alarms and found that there are 9 Don't Buys and 8 Best Buys.
Range of Smoke alarm scores
  1. 0%
    Lowest score
  2. 38%
    Average score
  3. 93%
    Highest score
We'll show you where this model sits on the scale so that you can see how it compares to smoke alarms we've tested
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Digital first month only £3.99, then £7.99 p/m, cancel any time

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.

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