I bought the unit with smart hub because I thought you needed that to use remotely from cell phone, then after I got mine I saw units with out smart hub cheaper and it showed using phone so I am confused and dontknow what smart hub is for? what does it do and communicate with what? I thought the display communicated with sensor out in yard . Im worried that if smart hub communicates with sensor in yard I need to locate in better spot so I dont lose signal which has happened once, so that is why I need to know what communicates with what and why. Other weather station dont have Hub but shows it cand be used with phone.