sensor battery issue
There is a possible MAJOR issue with your Simplisafe system I have discovered. The home base unit, the app, and the SimpliSafe central office does not know if there is an issue with a sensor in a particular situation. If the sensor is added to a system and working properly (shows no device errors) AND then the battery is removed, the systems do not know there is a battery issue and STILL reports the sensor as okay (actually, it does NOT report any device error). This is similar to a battery going dead or or a sensor's battery dislodges, falls out or is removed.
I am surprised that SimpliSafe can not "see" the current status of a sensor if this occurs.