HP CS10 Wireless Multi-device Keyboard??(Black). Smooth responsive cursor control with easy scrolling, Designed for professional or gaming use. Stylish Ultra-Slim design Keyboard & Mouse, Sealed membrane for overall protection, Brush metal finish, Advanced controls. Battery Type AAA. Size is Standard. 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. Professional Optical sensor with direct DPI switch 800/1200/1600 dpi. Responsibly designed, this keyboard helps reduce landfill waste by using post-consumer recycled materials that make up more than 60% of the plastics in the keyboard. It?s all part of HP?s commitment to supporting cleaner air and waterways for a better world.