We've tested and reviewed products since 1936. Read CR's review of the SimpliSafe CA002-01RUS smoke & carbon monoxide detectors to find out if it's worth it.

CR's engineers use high flames to see whether smoke detectors respond appropriately. By Courtney Lindwall, Daniel Wroclawski The ability to sense carbon monoxide (CO) with a smoke and CO detector ...

At CES 2025, Kidde fire and smoke detectors, which are among our favorites, now work with the Ring security app, and Ring's got a new monitoring plan to match.

And tests don't just confirm that smoke detectors have power -- they can also tell you if you need to switch out batteries before your alarm throws a high-pitched fit.