A few systems mentioned pulse measurement and such, but how accurate are they? They also do sleep tracking, but not high-quality, right? For example, where do they store the data in exercise mode? What's the maximum amount of data they can store? Do I lose my data during signal disruption as well?
How smart are smartwatches really?
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For example, fitness trackers like wristwatches also store data temporarily on the device before syncing it to your phone. If there's a signal issue, you lose the data that was recorded because there’s no continuous synchronization. Usually, they only keep up to about seven days of data.