I recently broke my collarbone while riding my Pint. I'm guessing it's because I didn't notice pushback but I have no way to know for sure. There should be a built-in audible alarm along with pushback, and it should be available via the app for those of us with older models. I suggested this through technical support but I'm pretty disappointed to find that many people have been suggesting this already and that other products already have this (should be required) feature.