Lenovo SpaceBall 3D Input Device, Microsoft Windows 98; Microsoft Windows NT, 6 x 8.5 x 3" (152.4 x 215.9 x 76.2 mm) Lenovo SpaceBall 3D Input Device. Compatible operating systems: Microsoft Windows 98; Microsoft Windows NT. Dimensions (WxDxH): 6 x 8.5 x 3" (152.4 x 215.9 x 76.2 mm)