CST2545W(GL) (L-Trac Glow) USB Wired Ambidextrous High Performance Laser Ergonomic Backlit Trackball (Black) - Made in the USA<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"> Width 3.75" (9.5cm)， Length 6.75" (17.1cm)， Height 1.75" (5cm) </span></li><li><span class="a-list-item"> Three LED's illuminate the ball a vibrant blue </span></li><li><span class="a-list-item"> Ball Size: 2.25" </span></li><li><span class="a-list-item"> LED lights will automatically Turn Off after 5 minutes of inactivity. </span></li><li><span class="a-list-item"> Resolution: User selectable 400， 800， or 1600 counts per inch </span></li></ul></div><img src="http://ecx.images-amazon.com/images/I/418s94SzIZL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41%2BfRnMd04L.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/41XGMhyeKFL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31lr0obtXGL.jpg" noproxy><img src="http://ecx.images-amazon.com/images/I/31C1%2BFtfeDL.jpg" noproxy>