?Make every beat count with Charge HR a high-performance wristband with automatic, continuous heart rate and activity tracking right on your wrist. See heart rate all day and during workouts to get more accurate calorie burn, reach your target workout intensity and maximize training time. Track steps, distance, floors climbed and sleep quality and more, and stay connected with Caller ID and time of day on display. Charge HR also wirelessly syncs to your smartphone and computer so you can monitor your trends and get the motivation you need to push yourself further every step, every beat, every day. You choose color and size (small or large).