The Power Output Sensor W.I.N.D. measures the actual, average and maximum power values. With the Power Output Sensor W.I.N.D. you can analyze the L/R balance between left and right foot and Pedaling Index (shows how evenly the power is distributed during one crank arm rotation). The Power Output Sensor W.I.N.D. also measures cycling speed, distance and cadence. You can easily download the data to the Polar ProTrainer 5 professional training software for further analysis. The Polar Power Output Sensor W.I.N.D. also has a built-in cadence sensor. The information is then transmitted to the Polar cycling computer (CS600).