Microsoft Wired Desktop 400 for Business Quiet Touch Keys - Quiet, responsive, thin-profile keys. Spill-Resistant Design - Integrated water channels drain liquid away. Plug-and-Play - No software needed. Just connect the keyboard and mouse to your PC and go! Windows Start Button - Simply press to launch your Start menu. If you have Windows Vista installed, search your PC or the Web right from there. Comfort for Either Hand: Microsoft Optical Technology - High performance tracking. Scroll wheel - Fast on-screen navigation.