Fitbit Alta HR Activity Tracker + Heart Rate

Description   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 See how working out more can improve your health by comparing your resting heart rate trends to your activity   Specs #Black-Small  Brand   Fitbit           Model #   FB408SBKS           UPC  816137024099  Condition  New #Black-Large  Brand   Fitbit           Model #   FB408SBKL  UPC  816137024037  Condition  New