The 1 Best-Selling Gaming Peripherals Manufacturer in the US: Source - The NPD Group, Inc., U.S. Retail Tracking Service, Gaming Designed: Keyboards, Mice, PC Headsets, and PC Microphones, Based on dollar sales, Jan. 2017- June 2020 combined The Lightest, Zero-compromise Esports Gaming Mouse at 69g: The Razer Viper includes a high-precision, 16K DPI optical sensor befitting the most serious gamers without the need for drilling holes in the chassis like competitor mice Faster Than Traditional Mechanical Switches: Razer optical mouse switches uses light beam-based actuation, registering button presses at the speed of light for absolute control Ambidextrous Design: Created for left and right-handed users with accessible, programmable buttons on both sides Customizable Chroma RGB Color Profiles: Includes 16.8 million color combinations w/ included preset profiles 8 Programmable Buttons: Allows for reconfiguration and assignment of complex macro functions through Razer Synapse 3 Drag-Free Cord for Wireless-Like Performance: Razer Speedflex cables eliminate the need for mouse bungees, drastically reducing weight and drag Included in Box: Razer Viper Wired Optical Mouse Chroma RGB Lighting Black Certified Refurbished, Mouse