USAF Evergreen Systems Diamond XX TrackballUSAF Evergreen Systems Diamond XX trackball unit. Compact input device with integrated trackball design. Unknown if in working order. Features Integrated trackball input design Compact form factor Evergreen Systems Diamond XX model Military surplus item Weight: 0. 3kg Condition: Used Good Item is well used. There may be marks stains scratches or repairs, but it is still in functioning order. If you want more information on our condition ratings, check