If you want to know more about the function of this product, I invite you to visit the manufacturer's website :)

Here is the response from our department responsible: The customer didn't provide much detail about the stage at which they got stuck, so it's difficult to help. However, according to the manual, he should pair the scale and the smartphone in this way: 1. Download the EufyLife app from the app-store (iOS) or google play depending on the operating system. 2. Activate Bluetooth on your smartphone. 3. Open the EufyLife app and follow the on-screen instructions to pair the scale with your device. Important note: Do not pair the scale from the Bluetooth menu on your smartphone. Use the EufyLife app to pair the scale with your smartphone. If the customer has already paired a device via the Bluetooth menu, they should remove the scale from the paired devices and pair it following the instructions above. The customer can also try to reinstall the application. If the problem persists, the customer can try contacting the manufacturer's technical support directly: support@eufylife.com