KEY FEATURES: Pure pulse continuous, automatic wrist-based heart rate tracking to better measure calorie burn all day Maximize your workouts using simplified heart rate zones (fat burn, cardio and peak) See call, text & calendar notifications on the old display; automatically track how long and how well you sleep and wake with a silent vibrating alarm Get a better understanding of your fitness level and see how you can improve over time with a personalized cardio fitness score; use connected...