This package contains:super slim keypad Produter name:super slim numeric keypad Characteristic:slim keycap Color:black,pearlescent Interface:PS/2 , USB, USB+PS/2 Compatiblity:IBM PC Operating Voltage:5V Operating currert:less than 50ma System requirement:use with IBM or 100% compatibles MS DOS,Windows32/95/98/ME/2000/XP operating system. Available PS2,USB,USB+PS2 port Note:Windows32/95/NT not support USB device.