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Hi, Sally. The Charge 6 can track your all-day heart rate and SpO2 while you sleep. Your Charge 6 will remain fully operational without a subscription to Fitbit Premium. You can check the added features included with Premium here: https://support.google.com/fitbit/answer/14237941 In the meantime, we'd like to assist you with your Charge 5. Please contact us on our help page here: https://goo.gle/contactfitbit
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