Refined Ergonomic Form Optimized for unrivalled handling and comfort: Developed in partnership with top esports pros, the iconic shape of the Razer DeathAdder has been further improved to continue its legacy of award-winning handling and comfort. Razer Focus Pro 30K Optical Sensor Best-in-class precision: Razer’s brand-new sensor provides flawless tracking performance on a wider variety of surfaces including glass—supported by intelligent functions for enhanced aim and control. Razer Optical Mouse Switches Gen-3 No double-clicking issues: No debounce delay. From an improved 90-million click lifecycle with zero double-clicking issues, to a blistering 0.2ms actuation with no debounce delay, the mouse has the reliability and speed built for esports.