Microsoft Wheel Mouse PS/2 Just plug Wheel Mouse into a PS/2 port, and it's ready to use. To take advantage of Wheel Mouse scroll-wheel features, simply install the included IntelliPoint software Roll the wheel forward or backward instead of clicking on a scroll bar or arrow for a fast and easy way to move through your documents Built to meet strict standards, Wheel Mouse is solid and reliable Just what you'd expect from a Microsoft product Scroll Wheel