meowracer
Cathlete
Lora - we posted at almost the same time. I have the Polar F11 and it does require a strap. As I understand it, when the battery goes, I may have to send it in but I'm not sure, nor am I pleased about that but so far, the battery has lasted. I had problems with the strap but like the older type of strap - I had one that came with a machine and it works perfectly. It shows HR all the time so you don't have to push a button. This is the model Diane Sue has too, I think. I have heard that unless you wear a strap, the models that use your wrist pulse are not as accurate.