Both are M185 by Logitech from the wireless combo MK275 One is brand new I bought yesterday and 1 was a warranty replacement made a few months ago. Reportedly their replacement product
Logitech MX ERGO Advanced Wireless Trackball Mouse
Logitech MX ERGO Wireless Trackball: Amazon.co.uk: Computers & Accessories
Logitech MX ERGO Wireless Trackball: Amazon.co.uk: Computers & Accessories
Amazon.com: Logitech MX Ergo Wireless Trackball Mouse, Ergonomic Design, Move Content Between 2 Windows and Apple Mac Computers (Bluetooth or USB), Rechargeable - With Free Adobe Creative Cloud Subscription : Electronics
Best Ergonomic Mouse? Logitech MX ERGO Overview! - YouTube
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 : Amazon.ca: Electronics
Logitech MX ERGO Advanced Wireless Trackball Mouse
Logitech MX Ergo Wireless Trackball review
The Ergo Series Products | Logitech
Logitech MX ERGO mouse- how good is it in 2023 - YouTube
Logitech MX ERGO Advanced Wireless Trackball Mouse