Tracking Sensor: PMW3327 Gaming Engine Resolution: 100~6,200 CPI Frame Speed: 8000 fps Acceleration: 30 g Tracking Speed: 220 ips Response Report Rate: 125~2000 Hz Key Response: 1 ms Net Weight:142 g (w/ cable), 100 g (w/o cable) Durability Button Lifetime: Over 20 Million Clicks ( Left / Right Button ) Wheel: Over 500,000 Scrolls