would that not be the very same likelihood of exactly the same thing happening with a professionally monitored system?
Yes, but the use of a PIN at the receiving end will prevent a mis-dial being accepted by the alarm system as a succesful dial out.
If you think for a minute you may see the way that an intruder on the premises can cancel the alarm without knowing the system's reset code.
You are comparing apples and pears Bernard,
While you are promoting the installation of apples but not telling the end user that they are not pears.
Your safety critical system would no doubt be protecting much more than domestic chattels.
Not always, one system was to alert the mobile wardens in a shelter housing scheme, getting a sympathetic ear to a resident was as important as getting help or emergency services. The residents had to have a system they had total confidence in.
sentimental gifts and digital photos on your laptop are not! {replaceable } But they have no or little insurance cover. The main purpose of the alarm is to try and make the burglars look elsewhere.
Yes that is the critical factor in
preventing a burglary. But it has to be an
effective deterent and sadly a bell box on the outside of a building can be very little deterent if the ccriminals know about the poor quaility of the system behind the bell box.
( that can be applied to most makes of alarm boxes )
In reality the Yale is a better system than some alarms as its an autodialler.
But you say the main purpose is to make the burglars look elsewhere. What purpose does the auto dialler serve in that "function" of the system.
One domestic alarm I am aware of has the system linked to a monitoring system with police called. That link is via a phone line for the alarm that is concealed from view by being run underground while the line for the house phone is over head and easy to cut before entry is attempted.