![]() ![]() Some have huge numbers of apps you can download, and some have batteries that will barely last a day, while others can go nearly a week on a charge. The former detects signs of atrial fibrillation, while the latter is a good indicator of respiratory health.īut the best smartwatches do all these things better than others. Electrocardiogram (ECG) and blood oxygen (SpO2) readings are perks of certain models, too. ![]() Many of the best smartwatches we've tested can detect elevated heart rate alerts and automatically connect you to emergency services if you take a hard fall. ![]() Smartwatches these days have health features that can even save your life. ![]()
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