The Polar FA20 tracks your physical activity and analyzes the impact on your overall fitness. Its simplicity will help guide you towards a more fit and active lifestyle. 24/7 activity measurement registers all effective active motion and shows it graphically Tracks active time - cumulative time of health beneficial body movement 5 activity zones show the effort of your activity Tracks active steps - body movement which is comparable to steps take during active time, with the correct intensity to improve fitness Tracks calories burned - know how may calories were burned and check your real time energy expenditure rate Time of day watch with dual time zones, calendar, and alarm with snooze Backlit display Keylock prevents accidental button activation Storage of 100 exercise files, stores calories burned, distance, and effect of training Transfer exercise data to polarpersonaltrainer.com via the new FlowLink interface system (see below) Water resistant to 30 meters Low battery indicator User replaceable battery (common CR2025) in both watch and transmitter (order spares below) Two year warranty Does not monitor heart rate Female version.