R8 Ultra-Core Wireless Gaming Mouse with Light Strike (LK) Optical Switch & Scroll Wheel - 8 Programmable Buttons and Advanced Macro [THE FASTEST RESPONSE TIMES] Innovative Light Strike optical switches and hyper-speed mouse wheel provide you blazing fast responsiveness. Stay one step ahead of your opponent by using infra-red beams instead of mechanical metal components to actuate crucial commands. Combine with Bloody Light Strike optical keyboards for a true 1:1 raw input and compete at Light Speed. [WIRELESS GUARD] Introducing the latest in patented calibration technology - never lose signal even with other wireless mice in the area [CUSTOM SKIN] Features SKULL N' BONES laser print for comic book fans [BLOODY 6] Precision tune your wireless R8 mouse to do just about anything - macros, scripts, automation - and share your profiles with friends [GAMING GRADE OPTICAL ENGINE] Built for precision and accuracy with an adjustable CPI/DPI. Change up on the fly with profiles and presets.