Kensington Orbit Wireless Trackball Mouse with Touch Scroll Ring (K72352US),Black
Kensington Orbit Wireless Trackball with Scroll Ring, Professional Computer Mouse with Bluetooth, (2.4GHz Wireless), Optical Tracking & AES Encryption Security, Left or Right Handed - Black (K70992WW) : Amazon.co.uk: Computers & Accessories
Kensington Orbit Mouse - Wired Ergonomic TrackBall Mouse for PC, Mac and Windows with Scroll Ring, Ambidextrous Design and Optical Tracking - Blue (K72337EU): Amazon.co.uk: Computers & Accessories
Kensington Orbit Wireless Trackball Mouse with Scroll Ring - Finger Control Ergonomic Mouse with Programmable Buttons, USB or Bluetooth Connection for Windows and MacOS - Space Gray (K72675WW) - Newegg.ca