With new smartphone and the need for a new bathroom scale, I have decided for the Medisana product and really the few details in the app are really cute features beautifully colorful. - After further inquiry at the manufacturer to reference values, which could explain the fluctuating or non-modifiable information cited only the alleged technical secret !? And really, it is a questionable technical mystery why succession specify the values for different measurements different values and why ever never change different values, although they would have to do this logically: For example, the percentage of muscle mass never changes. It is therefore suggested, in weight reduction lose you no muscles. Thus, if the actual muscle mass remain the same, the percentage of the total weight would logically increase accordingly. - Despite repeated demands by the manufacturer, nothing was explained. Too bad. I purchased the less functioning Activity Tracker. - Hands off, products are simply not mature, operating uninformative. Manufacturers information not willing! - Too bad