The Xiaomi Body Composition Scale S400 supports disabling the heart rate monitoring function. The heart rate monitoring is enabled by default. You can turn off the function in the settings. However, only the first account bound to the scale can enable/disable this function.
Note:
When enabling or disabling the heart rate monitoring function, it is necessary to connect the Xiaomi Home/Mi Home APP with the scale. Otherwise, the set command cannot be transmitted to the device, causing the set to fail.