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$399.99
The S-810i is like having a sports-research facility at your disposal. Like a well-informed coach, Polar's flagship monitor includes an exclusive R-R Variability feature to warn you when you approach excessive stress levels or are on the brink of overtraining. With the IR Interface (sold separately) and the S-810’s infrared technology, you can download your files at lightning speeds. Get back from your workout and in seconds, Polar Performance software (included) provides the most in-depth analysis right there on your computer.
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