Logitech ERGO M575 Wireless Trackball with Smooth Tracking
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 (Black)
Logitech ERGO M575 Trackball Mouse for Business
Logitech ERGO M575 Wireless Trackball Mouse with Ergonomic Design Black 910-005869 - Best Buy
Logitech Ergo M575, hands on: An affordable ergonomic wireless trackball | ZDNET