Kensington Expert Mouse Wired TrackballDiscover precision, comfort, and professional grade control with the Kensington Expert Mouse Wired Trackball. This premium ergonomic input device is built for long hours of work, creative editing, and data intensive tasks where precision matters. The oversized trackball invites a relaxed hand posture, helping to minimize wrist strain while delivering smooth, accurate cursor control. With four programmable buttons, a dedicated scroll ring, and reliable