1-Use built-in GPS to see your pace and distance on screen during outdoor runs, rides, hikes and more and see a workout intensity map in the app that shows your heart rate changes along your route 2-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 3-Use 24x7 heart rate to track resting heart rate better measure calorie burn. Syncing to mobile devices requires Bluetooth LE and internet connection. Syncs with Mac OS X 12.2 and up, iPhone 5S and later, iPad 5 gen. and later, Android 7.0 and later 4-See your SpO2 nightly average and range on wrist, and view trends over the past week in the Fitbit app (SpO2 is not available in all markets. The SpO2 feature is not intended to diagnose or treat any medical condition or for any other medical purpose) 5-Track your skin temperature each night to see how it varies from your personal baseline (Not available in all markets. Only available in the Fitbit app and only displays variation. Not intended for medical purposes) -Track workouts in real-time with 20 goal-based exercise modes. It’s also swimproof and water resistant to 50 Meters, so you can track swims, wear in the shower and more 6-Multi-day battery lasts up to 7 days and up to 5 hours when using built-in GPS (varies with use other factors). Track sleep stages review your in-app Sleep Score for an easy way to see how well you slept 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, Sp02, exercise modes and sleep tracking. Plus, with Fitbit Pay and up to 7-day battery life, you get more convenience on the go and more inspiration to reach your fitness goals.