Kensington Orbit Wireless Trackball with Scroll Ring - Space Gray (K72675WW),Black/Grey

Dual wireless connectivity offers the flexibility of 2.4 GHz and Bluetooth ( 3.0 and LE), with 128-bit AES government-grade encryption security
The scroll ring lets you spin the dial to move up and down web pages or documents with complete ease. And the 40mm balls hard surface is specially designed as a perfect sphere for precise tracking and control
Four DPI settings let you easily adjust the cursor speed to fit your needs by selecting the appropriate level (400, 800, 1, 200, or 1, 600) lower DPI for precision editing, and higher DPI for word processing or casual browsing
Ambidextrous design works equally well for right-handed and left-handed users. Trackball reduces wrist and hand movement to ease repetitive-stress injuries
Free KensingtonWorks downloadable software provides a personalized experience, giving you the ability to assign a variety of functions (including shortcuts) to the buttons, and adjust cursor and scrolling speed
Optical tracking technology delivers precise cursor movement for superior accuracy, so you can get where you want on the screen quickly with less hand movement, improving productivity and efficiency
A detachable wrist rest delivers soft cushioning to support the hand and wrist in ergonomic comfort for pain-free productivity during extended periods of activity on the computer
Mac and PC compatible