Product Features:Slim size designScissor-type super slim key top design similar to notebook keysbuilt in Touchpad for mouse functionality2 standard mouse button20 MCE hotkeys USB interfaceProduct Dimension:12.5"(L) x 8.5"(W) x 0.5"(H) inchPackage Includes:Scorpius R31 touchpad keyboardUser"s guideProduct Requirements: IBM or compatible system Windows 98SE/ME/2000/XP/XP MCE/Vista Available USB portMacintosh Requirements: Mac OS X with USB support Available USB portLinux RedHat supported with available USB port