Abstract: An alarming system detects a harmful gas, an over temperature, a fire smoke, etc. and alarms a user. If the user does not respond to the alarm within a period of time, the system automatically dials a list of telephone numbers to notify receivers of the telephone numbers about the danger. With the system, the user obtains a better safeguard to his own life. And the system can also be used to prevent a house from disasters when the user is out.