In ' (TNG) and later series, Starfleet officers and enlisted personnel wear small communicator badges on their left breast. These devices are in the shape of the Starfleet insignia and are activated with a light tap. They also incorporate the universal translator. There have been four versions of the communicator badge seen on screen. The first was a prototype used by members of Section 31 during the second season of ' (DIS). The second was used through "TNG" and in the first two seasons of ' (DS9). The third was used in the last five seasons of "DS9", throughout "," the four "TNG" films, and in flashback scenes in ' (PIC). The fourth was seen in use in 2399 in "Picard". Use of the modern badges dates back at least as far as the time of the "Enterprise-C." (Lt. Richard Castillo is shown wearing a communicator badge in the TNG episode "Yesterday's Enterprise," the Starfleet insignia of his TOS movie-era uniform now functioning as a communicator badge.)