Local ADT Dealers: What You Need to Know ADT is a leading provider of home security systems, and they have a network of authorized dealers across the country. If you're looking to get an ADT security system, you'll need to work with an authorized dealer. There are a few things you need to know about local ADT dealers. First, they are independently owned and operated businesses. This means that they have their own set of policies and procedures, and they may offer different products.