Polar Flow is a sports, fitness, and activity analyzer to be used with Polar GPS sports watches, fitness trackers, and activity trackers.* Follow your training and activity and instantly see your achievements. You can see all of your training and activity data on your phone on the go, and sync them wirelessly to the Polar Flow. *Compatible devices: http://support.polar.com/en/support/polar_flow_app_and_compatible_devices REVIEWS OF POLAR FLOW "I found Polar Flow to be a terrific complement to