Pip-Boy lingual enhancer

The Pip-Boy lingual enhancer consists of a storage holodisk, a microfilament cord, headgear, and an optical sensor that is placed over the user's right eye. When used, an optical flash transmits an entire dictionary into the user's memory, permanently improving the user's speech skills.

Attaining the lingual enhancement
It is a reward in the quest Learn about Vault City and education from Mrs. Bishop.

Male or female players can ask Mrs. Bishop about the G.E.C.K. or Vault 13 if they have not encountered those yet, and then ask her about Vault City. They may then, if Strength or Charisma is 6 or more, accompany her to her room on the top floor of the Shark Club. If the Chosen One can last in the sex to get to the pillow talk, asking about Vault City with 9 IN will get you this module.

Appearances
The Pip-Boy lingual enhancer appears in Fallout 2, and was set to appear in Van Buren, Black Isle Studios' canceled Fallout 3 project.