2.4 GHz Wireless Connection, Ergonomic Design, Energy and Electricity Saving, Plug and Play, Intelligent Dormancy, Drop Key Cap, HD Laser Engraving Fonts, Comfortable Experience Special Hand Feel Stylish Ultra-Slim design Keyboard & Mouse, Sealed membrane for overall protection, Brush metal finish, Advanced controls. Battery Type : AAA Professional Optical sensor with direct DPI switch 800/1200/1600 dpi, High quality switches for over 2 million clicks supported Smooth responsive cursor control with easy scrolling, Designed for professional or gaming use