Communicator (aka: Comm Badge, Communicator Badge) is a small, uniform worn device that allows communication with a simple tap to anyone aboard starships, starbases and on planetary installations. Communicator badges are used by the Federation Starfleet quite extensively as well as other space faring organizations. The Starfleet communicator is worn on the left breast. When tapped the communicator emits a small chirp and can call another communicator badge, access the ship's computer or send a signal to activate another piece of equipment.
Upon their arrival in the 24th century the crew of the USS Montana had to start using these new communication devices when they were used to the flip-lid box like communicators of the 23rd century.