The BIA measuring technique requires 3 pieces of information: height, age and gender. With this data, the scale calculates your fat percentage by combining the provided data with the body impedance measurements. Without this data, you can only get basic weight measurements, and the smart scale will not be able to give you a complete analysis. Your personal data along with the readings is locked to your user profile on the cloud, and can be accessed by only someone who has the OTP from your email/phone that you used to set it up.