Dreamcast Keyboard (Compact Edition HKT-4000). The compact Dreamcast is actually more common than the longer version which is commonplace in the North America & Europe.
The standard color is a clear grey, although a variety of keyboards were released in different colors such as pink and blue with the limited edition units like the Hello Kitty Dreamcast. There are also a couple of boxed keyboards that came bundled with a game like Typing of the Dead and Neon Genesis Evangelion: Typing Hokan Keikaku.
Typing of the Dead was one of the few games to win a Famitsu best-game award
The keyboard bundled with this release was exactly the same as the standard clear keyboard