Sensor: PixArt PMW3360 MCU/Processor: Holtek HT32F52352 Switches: Omron D2FC-F-7N 20M Wheel Encoder: Mechanical, tactile Size: 124.8 mm x 60.4 mm x 40.2 mm Ambidextrous: No Number of Buttons: 7 Weight: 102 g with weight, 96 g without weight Polling Rate: 125 – 1000 Hz...