Features o Built-in GPS o Active Zone Minutes o 24/7 Heart Rate o Track Workouts o Sleep Score o Get Notifications o Water Resistant o Spotift Control o Guided Breathing Sessions 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. You get more convenience on the go and more inspiration to reach your fitness goals. Resting Heart Rate Record your resting heart rate, track heart rate trends over time and follow your health & fitness progress. Heart Rate Zones During workouts, get real-time stats on screen to see whether you re in Fat Burn, Cardio or Peak zone, so you can dial the effort up or down according to your goals. Workout Intensity Map Get a better understanding of your effort during outdoor workouts with a map in the Fitbit app which shows when and how long you were in each heart rate zone. Goal-Based Exercises Go into exercise mode during your favourite workouts to set a goal for each workout and see real-time progress of your effort on screen. Water-Resistant Designed to be water-resistant to 50M, Fitbit Charge 4 automatically tracks swim workouts and can be worn in the shower, pool and beyond. All-Day Activity Tracking Charge 4 tracks all-day activity like steps, distance, floors climbed, Active Zone Minutes and calories burned to show how every part of your day gets you closer to your goals.