The Xiaomi Mi weight Scale 2 uses bio electrical impedance analysis (BIA) to measure the impedance to an electrical impulse that runs through the body and determine the amount of the fat or water in it, tell muscle and bone mass to name the few. Mi Body Fat Smart Scale features Bluetooth 4.0 to sync with your smartphone or tablet. A Mi Fit app allows to track your body metrics changes in a course of time and deduce what type of physical activity, diet, amount of liquid or else did best for your health.