Kensington Expert Mouse Wireless Ergonomic TrackBall Mouse for PC & Mac

Dual Wireless Technology - The ultimate in wireless freedom, allowing you to connect either via Bluetooth 4.0 LE that allows you to save a valuable USB port or through a highly reliable 2.4 GHz USB nano receiver
KensingtonWorks Customisation - Free downloadable software provides an even more personalized experience, giving you the ability to assign a wide variety of program functions to each of the 4 buttons, as well as adjusting cursor and scrolling speeds
DiamondEye Optical Tracking - Movement detection technology provides smooth, precise cursor control so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency
Scroll Ring and Large Ball - Spin the dial to move up and down web pages or documents with complete ease. The red ball has been specially designed with an absolute spherical, hard surface for precise tracking and control
Ambidextrous Design - Works equally well for both right-handed and left-handed users t