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Premium is more about the app than trackers but in order to get the most out of it you need a tracker that can track sleep stages, so a wrist-worn fitbit that has heart rate tracking. This covers most models including the Versa range, Ionic, Charge 3 and Inspire HR
There's more information about the Premium service at https://help.fitbit.com/articles/en_US/Help_article/2437/
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