A:AnswerBest buy and fitbit are 2 separate warranties. Fitbit has their own warranty and bestbuy has theirs if you choose to purchase it. One will not honor the other.
A:AnswerThanks for the inquiry. The Charge 6 can detect your heart rhythm. When you use the Fitbit ECG app, your heart rhythm data is analyzed for signs of AFib. Here’s a link with more details: https://support.google.com/fitbit/answer/14236718
A:AnswerThanks for the inquiry. The Charge 6 requires an Apple device running iOS 16.4 or higher. Here’s a link with more specifics: https://support.google.com/product-documentation/answer/14226283
A:AnswerIt 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