Over 3 million active users worldwide- The Renpho app is easy to use and can be downloaded for free from the App Store or Google Play. The measurement data in the RENPHO app can be synced with Samsung Health, Fitbit, Apple Health and Google Fit. Eco-friendly battery operation - With built-in lithium battery, the scale can be conveniently charged via USB cable. If the scale does not turn on after fully charging, please press the reset button on the back. Analyzes 13 important body values - Renpho Smart body analysis scale determines weight, BMI, body fat percentage and other important parameters. You can weigh yourself at any time, even without your smartphone. The measurement data is synchronized with the app the next time you connect. Fitness tracking made easy -Renpho app helps you achieve goals, track your daily, weekly and monthly progress. This scale is not suitable for professional athletes. Important Notes - Before taking measurements, please remove your shoes and socks. Step on the scale barefoot only. Your feet should touch all 4 electrodes. The scale must be placed on a hard and flat floor. Carpets or other soft surfaces can affect the measuring accuracy. Only the body weight can be read directly on the display, the other values are shown in the app.