Logitech Cordless Optical Trackman (USB/PS/2)<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"> No cord， no clutter， no hassle: cordless freedom， optical precision </span></li><li><span class="a-list-item"> Comfortable， right-handed shape with a large， finger-controlled trackball </span></li><li><span class="a-list-item"> Advanced buttons for easy navigation， plus a scroll wheel </span></li><li><span class="a-list-item"> Smart power management keeps battery working for months </span></li><li><span class="a-list-item"> Digital radio technology requires no line-of-sight; patented optical technology maintains smooth tracking and superior precision </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/417jvRpyYJL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41BBnmgUMqL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41GEWSTwmfL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/317-EjQMbzL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41l3dxQHxOL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/4104iUxcUYL.jpg" noproxy>