Computer Mouse-START Portable 2.4G Wireless Optical Mouse Mice For Computer PC Laptop Gamer-Silver With 6 Keys, including Scroll Wheel, Page Forward and Page Backward buttons for easy Internet Surfing Up to 10 meters of operating distance Resolution:400-1600CPI conversion Wireless transmission, the longest sensing distance up to 10-15 meters Full 1 year manufacturer's warranty-Adjustable DPI Switch: 1200/2500/3200DPI/4000DPI.