Fitbit - 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. | Facebook
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Amazon.com: Fitbit Sense 2 Advanced Health and Fitness Smartwatch with Tools to Manage Stress and Sleep, ECG App, SpO2, 24/7 Heart Rate and GPS, Lunar White/Platinum, One Size (S & L Bands