ADT is the leading electronic security services company in the U.S. We provide innovative, cutting-edge security solutions to 90% of Fortune 500 companies.

Before leading the way in the electronic security industry and moving headquarters to Florida, we began in Baltimore, MD, embracing the most advanced communications technology of the 1800s. While they didn’t have instant messaging back then, they had something similar. A telegraph system! This form of communication was more popular than carrier pigeons in the 1870s because it was faster and more reliable. A hand-written message was provided to a telegraph company from the sender. These messages were transmitted over telegraph lines to a receiving telegraph company at another location. They then decoded, transcribed, and hand delivered the message to the recipient.