Sensormatic, currently known as Tyco Fire & Security, is in the business of the manufacture an sale of electronic article surveillance equipment. Sensormatic Electronics Corporation was purchased by Tyco International Ltd. in 2001. The acquisition was executed by a merger of Sensormatic with a subsidiary of Tyco. Sensormatic is frequently called by the name of its parent company ADT, formerly ADT/Tyco. They manufacture acusto-magnetic (AM) electronic article surveillance systems.