Fitbit Charge 4 Gets Smart Wake, Dynamic GPS, and an Adjustable Display Timeout – Review Geek
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 Charge 4 gets 'smart wake' alarm and dynamic GPS with latest software update - The Verge
How to set alarms on your Fitbit - Android Authority
Fitbit Charge 4 update brings Dynamic GPS mode, Smart Wake alarms and more