• Tracking Resolution: 1,000 DPI
• Sensor Type: Optical
• Operating Range: 8-10m / 314.96-393.7in. from receiver
• Dimensions (Lx W x H): 103.3 x 61.3 x 37.4mm / 4.07 x 2.41 x 1.47 inches
• Switch life: over 3 million clicks
• Compatible with Win 98/2000/ME/XP/Vista/7/8