The Expert Mouse Wireless Trackball gives you the freedom to be hyper-productive without being limited by a USB cable. The trackball can be paired through Bluetooth® 4.0 LE to save a valuable USB port, or connected via USB nano receiver. TrackballWorks™ software offers incredible customization, and optical tracking technology offers smooth, precise cursor control. Plus, our award-winning Scroll Ring lets you quickly scan up and down web pages or long documents. Add it all up and you get exceptional comfort and ease-of-use from the brand that has set the industry standard in trackballs for more than 30 years.Wireless connection via Bluetooth® LE or USB nano receiverCompatibility with Bluetooth 4.0 LE: Windows® 10, 8.1 and Mac OS X 10.8 and later*TrackballWorks compatible with Mac only when using 2.4GHz connectionKensington worked directly with Microsoft to provide professional-level solutions that look as good as they function, so you can work like a pro.Optimized for your Windows 11 Trackball FunctionsTrackballWorks™ software lets you customize all 4 buttons, adjust cursor speedDiamondEye™ optical tracking technology for premium cursor control and accuracyAward-winning Scroll Ring lets you scan up and down pages with easeLarge ball is designed as a perfect sphere to provide exceptional precisionDetachable wrist rest supports hand and wrist for ergonomic comfortAmbidextrous design works equally well for both right-handed and left-handed usersAuto-sleep helps conserve AA battery lifeCompatibility with USB receiver: Windows® 10, 8.1, 8, 7 and Mac OS X 10.8 and later