Shuttle Mouse
From Sonic Retro
File:Saturn mouse.jpg
Saturn mouse - Japanese version
White versions came packaged with the Limited Edition of Sakura Taisen, but these were no different than those models that were sold separately.
In the US, a similar four-button mouse was released for use with the Sega NetLink system, except it was black. The US mouse is compatible with the Japanese mouse.
A UK release was planned for late 1995, but it never reached stores.