easy. Just like the $10 optical mouse I bought for my laptop. Naturally it comes as a USB connected mouse. When you buy the thing, in the package with it also comes a little green connecter....why green? Cause green is the color coded to be the PS/2 connector in the back. The little connector has the USB Female end on one end, and right on the other is the male end of a PS/2. Got it? Basically to sum it up, the mouse is USB and it comes with a small little attachment that connects to the USB plug of the mouse so then you can plug it into the PS/2