Other Monitoring Features.
A monitored alarm offers far more than just intruder detection. Monitoring checks the integrity of your system and can report warnings about low battery power and other faults in the system before these things become a serious fault.
A monitored Alarm can also protect you from the outbreak of fire by monitoring smoke and heat alarms.
With a monitored alarm you can also send out a duress alert should you experience an emergency that require external help while you are at home.