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A null field generator is a device that creates fields capable of deflecting multiple forms of transmissions. Sounds and radiation on one side of a null field cannot penetrate to the other side.
Close to the time of his death from old age, Angelo Colasanto kept a null field generator salvaged from the ruins of the Torchwood Hub hidden under the floor directly beneath his bed. The device shielded him from the effects of Miracle Day, thus preventing him from becoming immortal like the rest of humanity. After the device was discovered by the CIA in Colosanto's mansion, Jack Harkness used the generator to talk privately with agents Rex Matheson and Esther Drummond about the danger it posed to 21st century Earth. With the ability to hide almost any event from detection, Harkness warned that the temptation to kill and destroy on any scale — all in secret — would lead to a devastated and barren future. Before escaping from the mansion, Harkness slipped a panel from the generator into a coat pocket. (TW: End of the Road) It is unknown what Jack intended to do with the panel.