ZeFit2 uses a tri-axial accelerometer to detect your mouvements.
The data are analysed in order to count the number of steps done and deduct the amount of Calories burnt and the distance you have performed given the characteristics of the profile of the user (Weight, age, gender and height).
Be advised, ZeFit2 can take in account a few steps even if you are not doing any activity, if you are driving on a bumpy road, or if your arms are in mouvement.
Based on these inforamtions, ZeFit2 can calculate an estimation of the total Calories burnt according to your metabolism and your activities. As for the podometer and distance functions, the Calories count starts at midnight.
You can see all the informations on the dashboard of the application or the PC/MAC software.