We have a "Smarthome" total house system. It was made in Israel and includes some features that I have not seen on other systems. It WAS a DIY install and most of the components are battery operated. The only components that are hardwired to the console are the EXCESSIVELY LOUD speakers that are mounted internally, but right behind decorative vents in the eves. I ran those wires when the house was built and this is the second system we have had in 32 years.
We have the option of having the system call a local agency for a monthly fee, but opted out. If an alarm goes off, it calls our 2 cellphones and alerts us that a breach was made. The sirens point in all directions, and believe me when they go off because we pressed the wrong button(LOL) all the neighbors look out their windows. When that happens we make sure to make ourselves visible so the neighbors know we are home.
I have motion sensors, door sensors, etc. set up so that there is no possible access ANYWHERE. There is only 1 entry point, and that has a 1 minute delay, so WE can come in and have time to turn it off. There are day and night settings so we can be home at night and walk around while the house is still armed.
There are a dozen different personal voice announces that we put in, and we are alerted for each "breach". If someone enters the house we get a call and it even tells us what door they came in. It alerts us if the power goes out and the system goes to backup battery. If the sump pump overflows, if a smoke detector goes off, a CO detector - we know about it.
We've had it installed for about 10 years now and we simply love it.