This cardio belt is simply perfect, it connects without problem in Bluetooth with my iPhone 5s through free app Polar and it also works with the Endomondo app. The icing on the gift is automatically recognized by the cardio equipment of the gym or I make, and displays my heart rate directly on the camera without that I did nothing to settle. The elastic strap is very well designed, once it is attached the longer feel I am in a rather corpulent and I have no problem to fix. I do not regret my purchase! Great stuff!
