The Wrist Dealer is a device used for Turbo Duels.
This device is used by many characters throughout the series as a Deck Zone during Turbo Duels and sometimes for normal duels as well. This applies specifically for those whose Duel Disk's are hybrid, thus allowing their Wrist Dealers to attach to their Duel Disks without any problems.
During a Turbo Duel, the compartment on which the Deck stands in most cases is facing horizontally and above the wrist itself, hence enabling the normal Draw Phase for each duelist. For Yusei and Crow´s case, their Wrist Dealers' Deck compartments can easily flip until it acquires this position.
This device doesn't have a specific name in the Japanese version of the series. The Wrist Dealer is being promoted with this name by Konami as 2009's new Duel Disk launcher.