Before you zero in an alarm system to protect your home and family, it is best to take out some time to understand how ADT Security Systemswork. These security systems range from the basic electric circuit alarm to the most sophisticated wireless burglar alarm. Types of ADT Security Systems 1.Closed and Open Circuit Systems – This is a simple electric circuit that is placed at the entry points to the house. Such systems are activated through a switch that is used to open or close the circuit. In a closed system, the closing of the door or window to which the alarm is attached switches on the alarm, while in an open system, the door and window needs to be opened for the system to be switched on. Such systems are a good option for protecting the perimeter of a home or office. 2. Basic Motion Detectors – These are systems that protect the house by sensing movement through microwave or ultrasonic wave patterns sent out through a room. Movement within the room disrupts these patterns, triggering the alarm. 3. Advanced Motion Detectors – These are photo-sensitive motion sensors. Beams of light are sent through a room or passageway and when a person walks through the space, the light beam is disrupted and the alarm is triggered. Passive infrared (PIR) motion detectors are a further advancement in this category of alarm systems. PIR sensors work by detecting the heat emitted by a body as it moves through a given space. Wireless systems, such as motion detectors, are armed through a code entered into a keypad. Wireless ADT Security Systems A wireless alarm systems consists of: 1. Control Panel – This is the core that operates the entire system and is usually placed in a...