hana 2 Before even using the HRM, one of the two connectors between the chest strap and sensor broke. It's like a very weak metal rivet, which came apart. Cannot fix it myself.The return 返品 window is an unacceptable 1 month, so I lost my money on this. No product warranty.But, if the fixing on the chest strap did not break, I'm sure it would work just fine like the old model.Fortunately I still have the previous old model, which is working OK after a few years.