Y-10W 2.4 GHz Portable Finger Wireless Ambidextrous Trackball Mouse for Left/ Right Handed Users<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"> Free replacement and after sale service available， please buy with confidence. </span></li><li><span class="a-list-item"> Interface PS/2 or USB </span></li><li><span class="a-list-item"> Four group adjust DPI:400，600，800，1200 </span></li><li><span class="a-list-item"> Effective distance within 10M. </span></li><li><span class="a-list-item"> It can greatly ease the harm of palm joint or muscle for long time using mouse </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/41BcQs8406L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31G5v4V2RdL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41MhlOw47DL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41w2r5azAVL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31EA48vRhQL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41a7ESM8LPL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41%2B1Mh%2BHGkL.jpg" noproxy>