Fitbit Charge 3 Advanced Fitness Tracker with Heart Rate, Swim Tracking & 7 Day Battery

Sharp and smart touchscreen. With a large, backlit touchscreen that adjusts to lighting conditions, it's easy to view stats, notifications, or the time, whether it's at night or in the hot sun.
Up to 7 days of battery life. Thanks to its battery life of up to 7 days, Fitbit Charge 3 informs and motivates you at any time of the day and night.
Smartphone notifications. Stay connected with call and calendar alerts, message notifications, and quick responses.
Continuous heart rate monitoring. Continuous heart rate monitoring allows you to better control your calories burned, make the most of your workouts, and discover your trends. This will make it easier for you to get the batteries and improve your health and fitness.
Heart rate zones. Check your heart rate zones in real time to know if you are in the Fat Burning, Cardio or Peak zone and, depending on that, know the impact of your workouts.