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Unbranded Carbon monoxide alarm 4 review

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Don't Buy this carbon monoxide (CO) alarm – it failed to sound in 17 of our carbon monoxide detection tests

It failed to detect CO in 17 of our detection tests and it can't be trusted to alert you if there’s a build-up of the deadly gas in your home. 

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Reviewed

This dangerous carbon monoxide (CO) alarm cannot be relied upon to detect CO and then sound the alarm when you need it to. That's why we’re making it a Don’t Buy. It failed to detect CO in 17 of our detection tests and can't be trusted to alert you if there’s a build-up of the deadly gas in your home. If you have this alarm, you should replace it as soon as possible with a model from a well-known brand.

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Test results

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

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We have tested 26 carbon monoxide detectors and found that there are 10 Don't Buys and 16 Best Buys.
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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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