Method of Tracking: Infrared optical 1,000, 1500, 2000, 3000, and 4000 DPI A3050 sensor There are six buttons. The press force is 70g±10g. Up to 20 million button presses Voltage/current rating: DC 5V/<100mA Operating systems supported include Mac OS 10.3 or later and Windows®7, 8.1, and 10. Product Dimensions Unpackaged: L = 130.54 x W = 81.56 x H = 43.00 ±0.15 mm Length of Cable: 1.8m Weight of the unpackaged product (including cable and weighting block): 153.1g ±5g