When your phone and scale are successfully connected, the data be synced to the app. It allows you to clearly understand more data about your body in a timely manner and easily track your progress on your phone. Track changes at a glance - always pay attention to your body and help you reach your goals. The app provides detailed charts and saves historical data to track changes in your body composition over days, weeks, months and even years. Reach your goals with a scale. This product uses a high-precision sensor: To the accuracy of the measurement, please try to measure at the same time and under. Recommended measurement time, keep the same time and state every day.: Breakfast, measure before breakfast; Lunch, measure before lunch; Dinner, measure before dinner. Measurement requires bare feet, with left and right feet placed on the conductive plate respectively, and the body is straight. Please make sure the soles of your feet are clean when measuring. If there is dirt on the soles of your feet or socks, the authenticity of the measurement data cannot be ensured. Measure underwear as much as possible. Colour:B:Black Material:abs+ electronic Package Contents: 1 * electronic scale Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.