Make every beat count with Fitbit charge 2—the heart rate and fitness wristband built for all-day, workouts and beyond. Pure pulse continuous heart rate makes it easy to maximize workouts, better track calorie burn and get a snapshot of your cardio fitness level, while all-day activity and auto sleep tracking, lets you see how your whole routine adds up.

https://www.amazon.com/Fitbit-Charge-Fitness-Wristband-Version/dp/B01K9S24EM