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Flood and water alarm systems monitor your plumbing system where even small leaks can go unnoticed and result in thousands of dollars in repairs. Types of Alarm Sensors:Alarm Sensors are essential elements of your home security system. A wide variety of security alarm sensors and detectors are available for use. It is obvious what most sensors do, so we will only describe the main ones used in a basic system. Contact Sensors: Most burglaries involve doors, either on entry or while leaving the house. So protecting all doors is a must." This much is certainly true and it is true not only of the countries with a security problem, but also of even United States wherein recently a justice of the Supreme Court was appointed, though she had no experience of being a judge, but she was a friend of the Chief Executive of the country.