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It doesn't seem to monitor O2 levels except while sleeping. It can measure heart rate even when not connected to phone; it will need to sync when a phone becomes nearby, and then you can see heart rate history
Sorry, there was a problem. Please try again later.Hi there. While the Charge 6 will continuously record your heart rate, it does require a connection to a phone to sync to the Fitbit app. Here’s a link with more information: https://support.google.com/fitbit/answer/14237938?hl=en
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