The UIB-01 has already been discontinued and replaced with the UIB-02, which is upward-compatible with the UIB-01. The UIB-02 supports USB 2.0 for hi-speed data transfer. Please note that the UIB-02 responds to version 1.1 automatically when the host computer does not support version 2.0. The UIB-01 supports Windows 98 or later - before XP, and Mac OS 9.1 or later - before 9.2.2., and the UIB-02 supports Windows 98 or later - before XP, and Mac OS 9.1 or later - before X.