Lifesource XL20 Features: -Automatically tracks distance, activity time and steps. -Provides you with a complete record of your activity. -Easy-just clip on your shoe and go. -Calculates calories burned. -Matte black unobtrusive shell. -Tracks your daily activity with the LifeSource wellness connected software right on your home computer. -Views your daily, weekly or monthly activity levels and compare it against your personal goals to keep you moving towards better health. -No buttons to press your activity data is automatically uploaded to your personal computer. -Wireless connectivity. -User-friendly software. -One year warranty.