I bought the belt because my old Polar belt battery is not replaceable (which I think is a joke), but will probably still have to resort again to Polar. Use the belt on a treadmill. Problem is that the display / connection is working times and times not. You have before moisten the contacts or contact points on the chest, but even really wet it works sometimes yes and sometimes no matter how tight or loose I stretch the belt. Do not know if it's the chest hair (where the Polar belt so had no problems), anyway the Sigma Belt for continuous monitoring of the heart rate is not suitable for me.
