Polar CS100 Heart Rate Monitor Cycling Computer: The Polar CS100 combines all the features of a high end cycle computer with a fully functional heart rate monitor. With key features like AutoStart, Autostop and Autolap you'll have everything you need for sport or fitness riding. Enables you to foresee the time of arrival based on your cycling speed. Simply set the distance you are going to ride, and your cycling computer calculates the estimated time of arrival. Note: not a wrist-worn unit.