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ADT was first a part of Western Union, then ATandT. It explored on technology research related to signaling business, making the company identical with emergency call systems. World War II paved the way for a major breakthroughs alarms that signaled automatically to enhanced protection of families left home and secure supply factories. In 1974, on its 100th anniversary, ADT opened its first automated Central Monitoring center in Houston, Texas. Central Monitoring is one of the attributes that customers value primarily in an ADT system. ADT today is dedicated to providing continuing dependable, excellent service and innovative products to all its clientele. From safety and security of the common home and corner shop to equipping of sophisticated security systems for leading commercial amenities such as banking institutions, airports, large corporations and government agencies, ADT provides security solutions custom made to the individual hazard. Its commitment is to be a leader in corporate world and to work dynamically with communities to help them make places safer for citizens to live. ADT's endeavor to build a work environment where people are treated fairly and respectfully, and awareness about the environment and the responsibility of protecting it. Being the world’s biggest and leading provider of electronic security solutions it caters to about 8 million residences and commercial premises. It spearheads innovation of products for its customers.

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The control unit is the main operating panel for your home security system. This unit receives the signals from the sensors placed around your home, and triggers the alarms or contacts the home security center to notify them of any trouble whenever appropriate. The control unit may be powered by electricity that runs in your home, or by battery power. Some systems are set up so that if the power in your house goes out, a battery backup will kick in and run the control unit until power is restored. Once the power flips back on, the backup battery system will automatically recharge. The sensors, or switches, are the second part of the security system.