The system works on an alarm-trigger principle. The alarm signal is transmitted either via an active telephone line to the Central Monitoring Station or manually by pressing the emergency button. At the monitoring station the controller will ascertain the nature of emergency and recall the relevant information pertaining to the subscriber, depending on the need of the subscriber and the nature of emergency. The controller will initiate action which could be in terms of intimating the relevant authoroties such as police, ambulance service, fire department or dispatching a Response Team to the emergency site.