Mice & Pointing Devices
Kensington Orbit Wired Trackball Mouse with Scroll Ring K72337EU
Scroll ring and medium ball - By turning the wheel, you can effortlessly scroll up or down in web pages or documents. The blue 40 mm ball has been specially designed with an absolutely round, hard surface for accurate tracking and precise control....
https://www.bizrate.co.uk/pointingdevices/kensington-orbit-wired-trackball-mouse-oid27777151091.html