Bluetooth Smart Body Scale: 1. After establishing a Bluetooth connection with the scale, change the unit from kg to lb in the app. 2. Open the app on your smartphone and tap the "+ " button to initiate the weight measurement. 3. Stand on the body fat scale to complete the measurement, and the scale's display will show the weight in pounds (lbs). Wi-Fi & Bluetooth Smart Body Scale: 1. Please follow the steps mentioned above for the Bluetooth scale to change the unit. 2. After completing those steps, both the Bluetooth and Wi-Fi connections will display the weight in pounds (lbs). Please kindly note that that the device models that support unit switching are S3 Lite V2.0, S1 Pro V2.0, S3 V2.0, and Mini Pro V2.0.