In 2266, Uhura, who had been assigned to serve as the Enterprise's communications officer, used an earpiece in her left ear to determine that the starship was not receiving any signals from an odd cube encountered in uncharted space. After the Enterprise destroyed the cube, Spock wore an earpiece in his right ear while he reported to Captain Kirk that there was no sign of the cube, and considered possible consequences if the starship continued on its course. While later wearing her earpiece, Uhura hailed an object approaching the Enterprise that was actually a ship under the command of Balok, who had meant the cube to be a warning buoy. Shortly after she contacted Balok's ship, relaying a message from Captain Kirk, navigator Dave Bailey put another earpiece to his right ear. He used the device to receive a message transmitted over his navigation beam. Uhura, still wearing her own earpiece, was able to play Balok's message aloud so that the other officers aboard could also hear what wa…