The RS400 is designed for the active endurance athlete who wants to improve their performance by planning, monitoring and analyzing training data. 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 zones with audible alarm 3. HRm
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