ADT (home security)

ADT (home security)

ADT, originally called the American District Telegraph, is a U.S. and Canadadian provider of electronic security systems, fire alarm systems, communication systems, and integrated building management systems.

About ADT (home security)

ADT LLC dba ADT Security Services, originally American District Telegraph, now also known as simply ADT, is a U.S. and Canada provider of electronic security systems, fire alarm systems, communication systems, and integrated building management systems.