Sensor: Pixart PMW3320 Max DPI: 10,000 CPI Main Switches: Omron - rated for 20 million clicks Weight: 85g Size: 111.5 x 68.3 x 40.4 mm Number of Buttons: 6 buttons + scroll wheel Polling Rate: Selectable 1000/500/250/125 Hz (USB) Cable Length: 1.8 m