The iPhone application is nice and clear.
Only regret: notifications are a bit basic, and deserve to be improved.
For example, every night, the rate of CO2 passes> 2000ppm, go hop 2 alerts. It returns to normal, 2 alerts (one in 1000 and one in 2000). I was able to clear the alerts for 1000 but not for example set a custom alert to 3000.
Or, to be notified when a temperature reaches a value. I would be interested to know when to too hot in the room my daughter or too cold.
Finally, to have a useful solution, ie with 2-3 sensors, it is very expensive to just have temperatures ... You really have usefulness of records and centralized views in an application.
Also note that there is no display on the sensors themselves. Web mandatory to read the temperature