The Virtual Boy AC Adapter Set was an official Nintendo manufactured accessory for the Virtual Boy that was released in the United States for $19.95. The Virtual Boy required 6 AA batteries in order to use, so Nintendo made this cheaper alternative so that no batteries were required.
Trivia[]
In the December 1995 issue of GamePro, a reader sent in a question asking whether or not Nintendo was planning on releasing an alternative to the batteries. A rep from Golin-Harris suggested the AC Adapter.