OVERVIEW: With Fitbit Charge 4, there’s no limit to how far you can go. This sleek, swim-proof tracker is packed with features that help you know your workouts and your body better—like built-in GPS, Active Zone Minutes, SpO2, exercise modes and sleep tracking. Plus, with Fitbit Pay™ and up to 7-day battery, you get more convenience on the go and more inspiration to reach your fitness goals. FEATURES: BUILT-IN GPS: During outdoor runs, rides, hikes and more, use built-in GPS to see your pace...