I have a Simplisafe system in my home & shop & love it. I also have a motion sensor & siren in my motorhome when it is parked in my driveway. I remove it from the system when we are using the motorhome.
Easy to install and modify. I have it set to receive a text message when it is armed & disarmed.
The only issue I had was when I put a motion alarm in my office facing the curtains which are above a heater outlet and the heat came on and moved the curtains triggering an alarm in the early AM!
Ron