Tracking Method: Infrered optical • DPI: 500, 1000, 1500, 2000, 3000 and 4000 Sensor: A3050 Number of Buttons: 6 Button press force: 70g±10g Button press life: Up to 20 million Rating voltage/current: DC 5V/<100mA Supported Operating Systems: Windows®7/8.1/10 and Mac OS: 10.3 or later* Unpackaged Product Dimensions: 130.54mm(L)x81.56mm(W)x43.00mm(H) ±0.15mm Cable Length: 1.8m Unpackaged Product Weight: 153.1g ±5g (include cable and weighting block)