Bluetooth Diagnostic Scale TH-168BT makes a BIA (Bio-electric Impedance Analysis). BMI is a measurement of a person's leanness or corpulence based on their height and weight, and is intended to quantify tissue mass. It allows to evaluate your body composition and gives a complete picture of its condition.
You can transmit the weighing results to your smartphone using Bluetooth. Special mobile application provides a full monitoring of the results.

Other characteristics and advantages can be found here