Take a look at the permissions required by the official "Mi Fit" app (https://play.google.com/store/apps/details?id=com.xiaomi.hm....) vs the indie "Tools & Mi Band" app (https://play.google.com/store/apps/details?id=cz.zdenekhorak...).

The official app has more features admittedly, but nothing that justifies the level of permissions it asks for. At most it should need access to the camera/photos to allow you to set a profile photo, and full network access to create/sync your account data to the "cloud".

Nothing that the official app does justifies the following permissions it asks for:

  Device & app history

    retrieve running apps
    read sensitive log data

  Identity

    find accounts on the device

  Location

    approximate location (network-based)
    precise location (GPS and network-based)

  SMS

    receive text messages (SMS)

  Phone

    directly call phone numbers

  Photos/Media/Files

    access USB storage filesystem

  Wi-Fi connection information

    view Wi-Fi connections

  Other

    view network connections
    connect and disconnect from Wi-Fi
    read Google service configuration
    draw over other apps
    control flashlight
    reorder running apps
    modify system settings