Amazon.com: Logitech MX Ergo Wireless Trackball Mouse Adjustable Ergonomic Design, Control and Move Text/Images/Files Between 2 Windows and Apple Mac Computers (Bluetooth or USB), Rechargeable, Graphite - Black : Electronics
Logitech's MX Ergo trackball provides ergonomics, multiple device control to Mac users | AppleInsider
Logitech MX Ergo Plus Wireless Trackball Mouse in Graphite | Nebraska Furniture Mart
Logitech MX Ergo Wireless Mouse Black | Techinn
Logitech MX Vertical Review: The Clear Leader for Ergonomic Mice – Review Geek
Logitech MX Ergo Plus Wireless Trackball Mouse (910-005178)