DESC: The RS200sd was made for goal oriented runners who want to prepare for their first running event or who want to enhance their running experience. Polar exercise features: Wireless ECG accurate heart rate. Polar sport zones provides an easy way to select and monitor the intensity of training and to follow Polar s sport zones based training programs. Polar OwnZonedetermines an individual exercise zone. The Polar OwnCal shows energy expenditure during one exercise session as well as accumulated kilocalories during several exercise sessions. Polar Fitness Test with OwnIndex a fitness test that measures your aerobic/cardiovascular fitness at rest in just five minutes. Polar OwnCode (5kHz) Prevents cross-talk from other heart rate monitors. Three HR-based target zones with audible and visual alarm. HRmax(Polar Fitness test-based and age-based) Interval trainer (HR, pace, distance) guided workouts. Create your personal multizone workouts with heart rate/speed/distance and timing guidance. Interval timer is a pr...