Fitbit Alta HR - Large (Black)

* Get the power of continuous heart rate in Fitbit's slimmest design yet all day, during workouts and beyond * With heart rate, you can better measure calorie burn and use zones fat burn, cardio and peak to find the right workout intensity for your goals * With sleep stages powered by pure pulse heart rate, automatically track your time spent in light, deep and rem sleep coming soon and take steps toward a better night's rest * See how working out more can improve your health by comparing your resting heart rate trends to your activity * Automatically track your steps, distance, calories burned and active minutes with up to 7 hours of battery life