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From the Charge 4 Collection. With Fitbit Charge 4, there's no limit to how far you can go. This sleek, swimproof tracker is packed with features that help you know your workouts and your body better-like built-in GPS, Active Zone Minutes, new exercise modes and sleep tracking. Plus, with Fitbit Pay and up to 7 days of battery life, you get more convenience on the go and more inspiration to reach your fitness goals. Use the built-in GPS to see your pace and distance on screen during outdoor runs, rides, hikes and more. Also, see a workout intensity map in the app that shows your heart rate changes along your route. With Active Zone Minutes, feel a buzz when you reach your target heart rate zones during exercise, and celebrate when you earn extra minutes outside of exercise. Use 24/7 heart rate to track resting heart rate & better measure calorie burn. Play y