ADT is America's #1 Home Security Company. It's important to understand that most security companies only have one monitoring center, and in some cases, it's not based in America or even managed by an actual security company. With ADT, you get security from five interconnected command centers that are strategically located throughout the United States. Each command center is backed by powerful equipment and trained professionals, so if one connection is interrupted, one of the other centers can handle the monitoring for your home.