Detailed Product Description
You're looking at a couple of optical mouses which are, electrically, not very remarkable. The bigger one's your normal two button wheelie-mouse with a USB connector and a PS/2 adapter, which lets you use it with pretty much any somewhat recent PC or Mac. The smaller one's got just the two buttons and no wheel, and only a USB connector and no PS/2, but is just as standard as the other one as far as USB-equipped computers are concerned. Both mouses come with software that lets you configure the buttons to do different things, but you needn't install it. They'll work fine with the standard Windows mouse drivers.
What's unusual about them is that even the bigger one isn't very big. And the smaller one is downright minuscule.