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A jammer was a device used to scramble communications. Jamming devices were used by the Death Star, the Millennium Falcon, 74-Z speeder bikes, and RZ-1 A-wing interceptors. The Trade Federation used a jamming device to effectively stop communication on Naboo. Jamming devices however, had the habit of cutting off all major and minor communications inside the ship on which the jammers was installed, as well as jamming the enemy, making them very reliant on other ships. Essentially, it also jammed comlinks inside of ships and could jam scanners.