Features: Razer HyperPolling technology surpasses the industry standard with a true 8000Hz polling rate-sending up to 8 times more data in a second and reducing delay from 1 to 1/8th of a millisecond. Adopt second generation Razer Optical Mouse Switch, not only can withstand up to 70 million clicks, but also ensures quick and neat trigger, so you don't have to worry about accidental click triggers. FOCUS+ optical sensor has 20000DPI sensitivity and 99.6% tracking accuracy, ensuring that even the most subtle movement from this mouse is tracked with consistency. 71g lightweight design ensures faster and smoother operation, stable structure, suitable for left and right hands. Razer SPEEDFLEX Cable is designed to produce minimal resistance, you'll be able to perform quicker, smoother swipes for tighter mouse control. Specification: Brand: Razer Model: Viper 8KHz Sensor: FOCUS+ optical sensor(PAW3399), 20000DPI Polling rate: 8000Hz Tracking speed: 650 inch/s Acceleration: 50G Number of programmable keys: 8 Item size: 12.7 * 5.8 * 3.8cm /5 * 2.28 * 1.5in Item weight: Approx. 71g /2.5oz Packing list: 1 * Mouse