The Microsoft Business Hardware Pack (Model No. 1031) bundles the Microsoft Digital Media Keyboard 1.0 and the Intellimouse Optical 1.1 together in one great package. Compatible with PC or Mac, USB or PS/2, and with a zoom slider, volume/mute controls, and enhanced function keys, this is a very versatile keyboard and mouse pairing. The mouse features five buttons, including the scroll wheel. Two of the buttons are conveniently located at either side of the mouse and may be programmed for a number of functions like forward and backward or copy and paste. This keyboard and Mouse set will work with PS/2 ports. This is especially helpful in office environments where all USB ports are blocked out or disabled for security purposes.