Duel Disk
From Janime
Duel Disks are a series of devices manufactured by Kaiba Corporation as a portable form of the Duel Arenas used in the early part of the Yu-Gi-Oh! second series anime. They use a portable hologram generator to display Duel Monsters cards, and in the case of the Mark 1, the player's hand. Since their introduction in the anime and manga, they have become a staple among duelists.
There is also another Duel Disk released in East-Asian markets labeled as "Fight Disc for Card Games." It had a larger, static blade with slightly bigger card stages and additional slots for Monster and Spell cards as well as a space for the Fusion Deck in the main body of the disk. In addition, it had room for removed-from-play cards, a 4 digit life point counter (lacking the LED backlight of the international releases), and enough room in the Deck and Graveyard slots for over 100 sleeved cards (it worked just as well with sleeved and unsleeved cards), with the deck raised as each card is drawn. However, since it was a limited run, unlicensed accessory, it has become a rare item to find. It was also even more heavy and unwieldy than the officially licensed version, and international shipping rates prevent most fans from ever getting one.