If the battery is replaced then main panel continues to give an audible alert about battery being low
Also realized that the sim card is provided by H20 and is less expensive directly thru H20 who provides the cell service
I do see a lot of potential though, your mileage may vary
I thought that this kit would cover my home, but, I've had to order 2 more motion sensors and 5 more door/window sensors as I have outfitted my 2 out buildings as well as my travel trailer
00 a month for the cell service, hell, I can call 911 myself! Don't hesitate purchasing this system, it's a gem!
I completely redid factory programming to suit my install and it was super easy