The Polar F6 Fitness Monitor offers a stylish design with performance features to help you monitor your workout. It tracks your calories and percentage of fat burned with OwnCal® technology and OwnZone® automatically establishes your personal target heart rate zones. It also includes display of heart rate, exercise time and average heart rate. 24-hour clock with day/week indicator and stopwatch. Large easy-to-read display with split screen. One-year average battery life. Water resistant to 30 meters (100 feet).