The Fitbit Alta HR small fitness tracker is the slimmest wristband with heart rate by Fitbit & has a trendy, eye-catching design & an easy to read tap OLED display to allow for checking stats, smartphone notifications & time. Made to help you live healthier, the Alta HR provides accurate Pure Pulse® wrist-based heart rate measurement & thanks to innovative Smart Track feature, it automatically recognizes activities to record them in the exercise section of the Fitbit app. It monitors steps, distance, calories burned, active minutes, hourly activity & stationary time & lets you improve sleep quality with Sleep Stages & Auto Sleep Tracking features. To enable you to personalize your tracker, there is an interchangeable band & friendly Reminders to Move motivate you to reach an hourly goal of 250 steps.