The RS400 is designed for the active endurance athlete who wants to improve their performance by planning, monitoring and analyzing training data.Polar exercise featuresWireless ECG accurate heart rate.Polar sport zones.Polar OwnZone®.Polar OwnCal®.Polar Fitness Test™ with OwnIndex®.Polar OwnCode® (5kHz).Polar OwnOptimizer™.HR-based target zones with visual alarm = 3. HR-based target zones with audible alarm = 3. HRmax(Polar Fitne

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