The Lifetrak Core 210 automatically tracks your activity during the day and night! Sleep, calories burned, steps taken and distance traveled are all recorded. Your data displays on the home screen for easy viewing? No extra parts like a phone or charging are needed. It’s all on your wrist! The Core 210 combines sleek styling, versatility, and easy to use functions to help you take control of your health and it’s waterproof! The Comfort Fit band is reversible and interchangeable. Additional band colors are available at LifeTrakUSA.com.