2.4GHz wireless mouse.Advanced optical technology.Nano receiver hidden into the button of the mouse.Built-in energy saving system.Elegant and ergonomic design.Scroll up and down directly without moving your hands.Comfortable hand touch.Cover with mouse On/Off function.Designed for notebook and netbook users.Changeable resolution: 800/1600dpi.Keys" life over 1,000,000 times.Compatible with Windows 9X/2000/XP (32 bit)/Vista (32 bit)/MAC OS. Package Details Weight: 159.43 g Size: 14.3*14*7 cm Package Includes 1 ? Portable 2.4GHz Wireless Mouse