With the Polar OH1 optical heart rate sensor, you can record your heart rate data and transfers it to the Polar Flow app and web service after you finish training. You can record up to 200 hours of training on Polar OH1 memory.

Getting started with the Polar OH1: https://www.polar.com/en/products/acc...
Register for Polar Flow coaching service here: http://flow.polar.com/

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