The Expert Mouse Wired Trackball is the productivity enhancer professionals use to get more work done in less time. It offers highly accurate cursor control and great comfort for your hand and wrist. TrackballWorks software can customize the four buttons, and the Scroll Ring lets you quickly scan up and down your screen. KensingtonWorks lets you customize all four buttons, set cursor speed. DiamondEye optical tracking technology for premium cursor control and accuracy. Award-winning Scroll Ring lets you scan up and down pages with ease. Large 55 mm 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. Kensington worked directly with Microsoft to provide professional-level solutions that look as good as they function, so you can work like a pro.

• This premium trackball mouse employs Diamond Eye optical technology for smooth, precise cursor movement.
• Its large ball gives you maximum precision and control while tracking.
• The comfortable, ergonomic design includes a detachable wrist rest that cradles hand in comfort.
• Scroll Ring allows precise fingertip scrolling.
• Designed to maximize your productivity.
• USB connectivity.