No tracking ball is required
Works on most surface
Reliable & comfortable control
High speed motion detector
Three programmable buttons
Tracking speed 800 dpi
Dimension (DxWxH): 115x 63x 40 mm
System Requirement:
Windows 95 / 98/ Me / 2000 / NT, Dos 3.3 or later
Hard disk drive
USB or PS2 mouse port
IBM PC 486/586 Pentium compatible