1Byone body fat scale utilizes Bio-electrical Impedance Analysis(BIA) to calculate 14 key body composition metrics. It can give you an overview of your body and track your daily, weekly, and monthly progress by day, week, month and year. Syncs the data to your favorite fitness apps like Apple Health, Google Fit, or Fitbit app. Have a fitness or health goal? Digital weight scale supports you and your family to share 1 smart scale. High-Sensitivity sensors and electrodes give you precise body measurements with the latest BIA. Low battery Lo is shown when the battery power is low. The scale will automatically turn off after a few seconds, please replace it with new batteries. Re-Calibrate scale to "0.0" after moving, shifting, or replacing batteries, indicating that the calibration was successful.