The Elecom Lunaris TK-LU2BHSV is a USB numeric keypad with a built-in 2-port USB 1.1 hub. It can be used with Windows XP, Me, 98, and 2000. No software installation is required as the Num Lock key issue is resolved in hardware. Like many laptop keyboards, the numeric keypad uses a scissor-switch key mechanism, providing comfortable and reliable input. This item is unused. It has been stored at home. The box may have scratches or stains due to long-term storage.