Fitbit FB523BKBK-FRCJK Smartwatch with GPS Heart Rate Monitor Sleep Tracking 24/7 Activity Tracking Black/Graphite L/S```html Product Highlights Bring a new perspective to your daily routine and plan your workouts according to your condition for the day. With today's energy score calculated from activity, sleep, and heart rate variability data, you can determine whether you're ready for a hard training session or should prioritize rest. *1 *1 Battery life may vary based on usage and other factors. If using always on display mode, please charge the battery more
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