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Don’t buy this unbranded carbon monoxide (CO) alarm. In our tests, it repeatedly failed to detect danger and sound the alarm when exposed to three different and deadly concentrations of carbon monoxide. In later tests, its performance was just as poor. It doesn’t detect CO reliably and this makes it an unsafe product. If you have one in your home, the best thing to do is to replace it with a Best Buy as soon as possible and ask the seller you bought it from for a refund.
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- Aug 2024Last checked by Which?
- Jun 2023First reviewed by Which?
- Jan 2023Released