When a monitored theft alarm is triggered, a signal is sent to a central monitoring station.  This station will confirm the alarm.  If the alarm is confirmed they will notify the appropriate emergency services (i.e. Police).  Only answer to yes to this question if you have confirmed with your theft alarm provider that your alarm is monitored.
PROPERTY PROTECTION SYSTEMS
The “Insured” must notify the Insurer of any change to, interruption to, flaw or defect in any sprinkler (or other fire extinguishing system), fire detection system or intrusion detection system. If you do not notify the Insurer, the Insurer is not obligated to pay for a loss that would otherwise by covered by this agreement, but only to the extent that such loss was made worse by such change, interruption, flaw, or defect.