If you have a xaiomi smartphone, then there will be no problems, and if another, then you need to install a special application for them, which will allow you to see this watch, but only in the Chinese region. For example, I did not manage to set it up. There are H / M (Hours / Minutes) buttons on the case, but, here's a surprise, they are decorative, you can't set the time through them either.See full review