The Expert Mouse Wired Trackball is the ultimate productivity enhancer that makes working at the desk quicker, more accurate and extremely comfortable for your hand and wrist. Featuring DiamondEye technology, the trackball uses optical tracking to precisely follow small flecks embedded in the large 55mm ball to provide smooth, accurate cursor control. The four buttons are customizable using our highly intuitive TrackballWorks™ software, while our award-winning Scroll Ring lets you quickly scan up and down web pages and large documents. Add it all up and you get exceptional comfort and ease-of-use that has set the industry standard for more than 20 years. TrackballWorks™ lets you customize all 4 buttons, set cursor speed Mac® running OS X or later with an available USB Port.** Internet connections or CD ROM drives to install the software.** Compatible with Windows®7, Windows® XP, Windows Vi Kensington worked directly with Microsoft to provide professional-level solutions that look as good as they function, so you can work like a pro. Optimised for your Windows 11 trackball needs. DiamondEye™ optical tracking technology for premium cursor control and accuracy Award-winning Scroll Ring lets you scan up and down pages with ease Large 55mm ball is designed as a perfect sphere to provide exceptional precision Detachable wrist rest supports hand and wrist for ergonomic comfort Reliable wired USB connection Wired 180cm USB cable provides reliability and avoids need for batteries Detachable wrist rest cradles hand in comfort PC and Mac® compatible