The Communicators were special devices used by the Sailor Senshi to keep in touch with each other. There were three different versions in the manga, anime and Pretty Guardian Sailor Moon.
In the manga, the senshi wear wristwatch-type communication devices which allow them to speak with each other. Two sets appeared throughout the series. The first set appeared in Act 03, Volume 01, and came directly from the Sailor V game. The second set were given to them after Chibiusa's appearance.
AnimeIn the anime, the communication device is a small, flat, computer-like object that is used by the senshi in the first season in order to communicate with each other. This item first appears in episode 017.
In episode 62 of the R season, the Senshi received new communicators along with their Star Power Sticks. These new communicators resembled wrist watches, and the face resembled Sailor Moon's Crystal Star. In the S season, Sailor Uranus and Sailor Neptune also had similar communicators just to communicate with each other. Haruka's communicator is a series of golden discs and the watch itself is a blue and gold clam shell, emblazoned with the symbol of Uranus. Michiru's communicator is identical to Haruka's, but has a dark turquoise motif rather than a blue one and has the symbol of Neptune on it.
Second AnimeThe Sailor's would use these to communicate with each other. They received new communicators along with their Star Power Sticks. These new communicators resemble wrist watches. Even Mamoru had a communicator in season three.
Pretty Guardian Sailor Moon
Main article: Teletia SIn Pretty Guardian Sailor Moon, the senshi use regular cell phones as communication devices. These are known as "Teletia S" and first appear in Act 01. The senshi could also use these cell phones to disguise themselves. By taking a picture of any person, the senshi could disguise themselves to look exactly like that person. For easier use, the picture taken could be used right away or later.