Logitech Marble Mouse - Trackball for USB & PS/2

Marble Mouse® Affordable, maintenance-free optical sensing technology.
Fits like a mouse, works like a trackball

The Marble Mouse fits your hand like a mouse but works like a trackball. For both right-handed and left-handed users.

System Requirements:
· IBM compatible PC with available PS/2 or USB port
· CD-ROM drive
· One of these operating systems:
· Windows^® 95/98, ME, NT, 2000 & XP
· Macintosh OS 8.6 or later

Physical Specifications:
· 6.5 in. long x 3.5 in. wide x 2 in. high
· 1.5 in. diameter optic sensing ball
· 6-ft. USB cable (USB to PS/2 adapter included)

Warranty
· 3 year manufacturer's warranty