LifeTrak Brite R450 Heart Rate Watch The LifeTrak Brite R450 is the perfect fitness band for those on-the-go. The ECG Accurate Heart Rate will give you calorie estimates and track your intensity level. LightTrak makes sure you are getting the proper exposure to natural light in order to improve your mood and give you extra energy. With SleepTrak 2.0, the R450 will provide auto sleep, nap and wake detection. The Precise Tracking automatically tracks how many calories you burn and how many steps you taking while burning them. The R450 is water resistant so you don’t have to worry about taking it off before taking a dip. The LifeTrak Brite R450 is fitness at a whole new level.