Originally Posted by
nmenaker
correct, the sensors and the base station should provide audible alerts if a sensor is tripped. but, if you don't have the ARM code, you really can't enable it at all. And, I'm not sure you can RESET the ARM code without ADT. Maybe on the internet there is are reset instructions.
Mine, which is a wired system - part about 20 years old and part about 8 years old - works fine without a contract. I let it lapse once for a couple of months as part of it was burned out over the years by nearby lightning activity. I cannot say about the newer systems. YMMV