Kensington Orbit Wireless Mobile Trackball Black K72352EU AC30099
Kensington Orbit Wireless Mobile Trackball mouse (a look at) - YouTube
Kensington Orbit Mouse - Wireless Mobile & Compact Ergonomic TrackBall Mouse for PC, Mac and Windows with Touch Scrolling, Ambidextrous Design and Optical Tracking - Red (K72352EU) : Amazon.co.uk: Computers & Accessories
Kensington Orbit Wireless Trackball with Scroll Ring Review - RTINGS.com