Withings Body connected scale: allows you to set and reach goals by synchronizing with Health Mate app. Evolution curve. Supports up to 8 users. This Body scale uses patented Position Control technology to deliver an accurate result of weight and BMI. It also provides instant on screen feedback. You can use the free Health app to help reach your weight goals. This device is an advanced scale to help track weight. Use Wi-Fi or Bluetooth connection and sync to the app. Tracks BMI Activity tracker Family and friends features Weight trend screen. Please follow the instructions provided in the box.