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 Star Trek: Discovery (DIS). The second was used through TNG and in the first two seasons of Star Trek: Deep Space Nine (DS9). The third was used in the last five seasons of DS9, throughout Star Trek: Voyager, the four TNG films, and in flashback scenes in Star Trek: Picard (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.) According to Data in the episode "Time's Arrow, Part One" at a poker game in 1893, the badge is made out of a crystalline composite of silicon, beryllium, carbon 70 and gold. In Deep Space Nine, Bajoran officers and enlisted personnel also wear a small communicator badge that functions much the same as their Starfleet counterparts. However, Bajorans wear their badges on the right breast of their uniform tunics. Cardassians are shown wearing their communicators on their left wrist. While wall and desk panels are still present, officers and crew consider them a secondary system, relying primarily on the badges. Viewscreens are used for visual communications. In Starfleet vessels and installations, communication can also be accomplished by verbally directing the computer to initiate communications with another person. Relation to current real technology On July 12, 2010, CBS released an iPhone application, created by Talkndog Mobile, called Star Trek Communicator. The application replicated the design and iconic chirp of the communicator. In June 2016, The Wand Company Ltd. released a highly accurate and working replica of the Star Trek: The Original Series Communicator using Bluetooth to enable it to pair with, and connect to, a Bluetooth enabled mobile phone so as to allow it to be used in exactly the way envisioned in the original Star Trek TV show; to make and receive calls. Advances in voice recognition and cloud-based artificial intelligence allow the user to use voice