And then there's the mechanical hood lock that you can add.
It's at DEI site

Plus an additional siren they put inside the car to make the thief supposedly "deaf" + backup power source just in case they cut your battery.

Pager system helps, but not quite. Range for DEI products are 1/4 mile and 6000 ft for Compustar.
I got broken into twice while I left my car to go out of state...