Best Smoke and Carbon Monoxide Detectors of 2025

That’s why we put dozens of models to the test. In our lab, we expose detectors to low CO levels (100 parts per million) and high CO levels (400 ppm) to see how quickly and accurately they detect the colorless, odorless gas. For models that display or announce specific CO levels, we check the accuracy…

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Best Car Seats Under $250

If there’s one thing that decades of car seat testing have shown us, it’s that you don’t have to pay top dollar to get a safe, high-quality child car seat. Many of the top-performing seats in CR’s car seat ratings cost less than $250, from infant car seats to convertible car seats to high-back booster…

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What Is a Preamp, and Do I Really Need One?

Every audio system requires amplification. In a traditional hi-fi set-up, the loudspeakers are always “passive”—which is to say, they don’t produce their own power. Instead, they must receive an amplified audio signal from an external source, aptly called an amplifier, in order to do their thing. Even in a more modern, self-contained audio system (like…

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