25% Faster Than Other Wireless Mice in the Market: For complete wireless freedom, Razer HyperSpeed wireless technology combines extremely low latency and interference reduction. At 74g, this wireless esport gaming mouse is lightweight and compromise-free. The Razer Viper Ultimate does not require drilled holes to achieve its weight and has a 20K DPI optical sensor that is suitable for the most dedicated gamers. Superior to Conventional Mechanical Switches in Speed: The new Razer optical mouse switches register button presses at the speed of light thanks to light beam-based actuation. ambidextrous Design: Designed with programmable, accessible buttons on both sides for both left- and right-handed users. IPS Maximum Speed: 650 Profiles of On-board Memory: 5. Dock Compatible