Extremely Good F1 Leftscroll 2.4G Wireless Mouse --Blue Perfect ergonomics design, Precise scroll wheel DPI button to select favourite cursor speed 800-1200-1600DPI Plug and play, no need to install driver, supports Windows 2000/2003/XP/Vista/7/8 2.4G technology provides a working distance up to 8m-10m The first leftscroll mouse in the world