Fitbit Charge 5 Advanced Fitness and Health Tracker (Black)Meet Charge 5, the most advanced fitness and health tracker with tools like an on wrist ECG app for heart health. You can see your routine in a new light thats 2x brighter than Charge 4, and use always on display mode to check your progress with just a glance. Active Zone Minutes The Active Zone Minutes guide you to your heart rate zone and helps you keep up the intensity. Sleep Tracking and Sleep Score Get a better understanding of your sleep quality