Logitech Optical Marble Mouse (USB/PS2)<div style="text-align: left;"><strong>[Product Information]</strong><ul><li id="replacementPartsFitmentBullet" class="aok-hidden" data-doesntfitmessage="We're not sure this item fits your " data-fitsmessage="This fits your "><span class="a-list-item"><span id="replacementPartsFitmentBulletInner"><a href="#" class="a-link-normal hsx-rpp-fitment-focus">Enter your model number</a>to make sure this fits.</span></span></li><li><span class="a-list-item"> Durable optical technology for smooth precision and resistance to dirt， eliminating the need for cleaning </span></li><li><span class="a-list-item"> Large， finger-operated trackball for superior control and reduced hand and wrist movement </span></li><li><span class="a-list-item"> Sleek shape flexible enough to use in either hand </span></li><li><span class="a-list-item"> MouseWare software included for easy scrolling on the Web (in Windows and Macintosh applications) </span></li><li><span class="a-list-item"> A variety of button assignments to customize your mouse buttons </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/417FCRZRJ9L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41APHPMTCKL.jpg" noproxy>