The Micropad 631 keypad is a USB and PS/2 numeric keypad. with supplied USB to PS/2 adapter Micropad 631 can be used with any computer. Easy to use no software to install just plug in and start working. Features:. 18 Keys. USB and PS/2 connections (USB to PS/2 adaptor included). Full-size numeric keypad. “Plug and Play”. Low power consumption. No software required. Includes two selectable Num-Lock modes for switching between number and cursor functions. Operating Systems Supported:. USB: Windows 98se / ME / 200. PS/2: Any PS/2 compatible PC.