For years, ADT has been the number one trusted source of protection for millions of families, homes, and businesses. By signing up for ADT monitoring, you are ensuring that trained professionals with the most sophisticated and innovative security devises are monitoring your home at all times, 24 hours a day, 7 days a week. ADT monitored security systems allow you and your family to take advantage of technological advances like home security camera systems and other high-tech home security products.