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Fitbit Charge 4 major update adds Dynamic GPS, Smart Wake alarms - PhoneArena
Fitbit Charge 4 review: No contest - Android Authority
fitbit on Twitter: "Smart Wake activates a gentle buzz on your wrist during your lightest sleep stage so you can really take flight when it's time to rise. Goodbye, groggy. Hello, energy. #
Fitbit's update for the Charge 4 will help you wake up at the "best time" - SoyaCincau