The RS400sd is designed for the analytical runner who demands more information.The ability to plan, monitor and analyze training data including speed and distance at your fingertips. Polar exercise features Wireless ECG accurate heart rate. Polar sport zones. Polar OwnZoner. Polar OwnCalr. Polar Fitness Testtm with OwnIndexr. Polar OwnCoder 5kHz. Polar OwnOptimizertm. HRbased target zones with visual alarm 3. HRbased target zone
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