I'm looking at getting an alarm system, in particular one of the Yale smart alarms. There are two ranges IA and SR. From what I have read the SR series uses RF and the newer IA series uses WiFi. Can anyone comment if one is better than the other? Looking at the Yale website I can see the SR has a range of 30m and the IA a range of 200m. Other than that they look pretty much the same, both have a smart app, range of different sensors you can add etc.