The watch is good but it doesn't sync with the polar flow app. This is an expensive watch and the features cant be used which renders it pretty pointless. Polars default response if you get one is to tell you to basically pair/reboot your phone and watch everytime you want to sync and even then it rarely does. If you read this and get one and it doesn't sync, you were warned. Buy something else if i were you.
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Polar is a leading provider of heart rate and fitness assessment technology.