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Hi, Harry. Your Fitbit device measures your SpO2 levels while you sleep using red and infrared sensors on the back of the device. You can also export minute-by-minute blood oxygen saturation (SpO2) data collected while you sleep. For more information about Fitbit SpO2, visit https://support.google.com/fitbit/answer/14226120 To export your data, you can follow the steps here: https://support.google.com/fitbit/answer/14236615 For any additional questions and concerns, reach us at https://goo.gle/contactfitbit
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