Love the contour next ez device which is not bluetooth, I do not love the app at all. You have to sign in and always stay signed in, or the app won't work. Imagine you're trying to record your blood glucose levels for your doctor, and you can't because you're out of the area? I use Blood glucose tracker app is a much better app and you don't even have to sign in with it at all. It allows you to do far more collecting like your weight blood, blood pressure, pulse etc