Logitech ERGO M575 Wireless Trackball with Smooth Tracking
Logitech MX Ergo Review: A Worthy Heir to Logitech's Lengthy Trackball Mouse Lineage – Review Geek
Amazon.com: Logitech ERGO M575 Wireless Trackball Mouse - Easy thumb control, precision and smooth tracking, ergonomic comfort design, for Windows, PC and Mac with Bluetooth and USB capabilities - Off White : Electronics