Kensington Expert Trackball Mouse (K64325), Black Silver & Orbit Trackball Mouse with Scroll Ring (K72337US)

Kensington Expert Trackball Mouse (K64325), Black SilverThe Expert Mouse Wired Trackball is the ultimate productivity enhancer that makes working at the desk quicker, more accurate and extremely comfortable for your hand and wrist. Featuring DiamondEye technology, the trackball uses optical tracking to precisely follow small flecks embedded in the large 55mm ball to provide smooth, accurate cursor control. The four buttons are customizable using our highly intuitive KensingtonWorks software, while our award winning Scroll Ring lets you quickly scan up and down web pages and large documents. Add it all up and you get exceptional comfort and ease-of-use that has set the industry standard for more than 20 years.Kensington Orbit Trackball Mouse with Scroll Ring (K72337US)All-day comfort and scrolling come together in the orbit trackball with scroll Ring. The award-winning scroll Ring allows you to spin through web pages and long documents without the need for clicking. It offers better ergonomics, with less wrist and hand movement that will ease The pain of repetitive-stress injuries. KensingtonWorks software gives you the opportunity to assign specific functions to your 2 buttons and create a truly customized productivity experience. Optical tracking provides smooth and accurate cursor control, and a detachable wrist rest offers terrific ergonomic support when you're hard at work.

• Product 1: Large 55mm ball design and Diamond Eye optical tracking for precise cursor control; Patented scroll ring lets you scan up and down pages with ease
• Product 1: Detachable, ergonomic wrist rest supports hand and wrist for improved comfort; Ambidextrous design
• Product 1: Customizable 4-button design, scroll speed and cursor speed via KensingtonWorks software
• Product 1: ChromeOS user can get HID functions for a trackball but will not be able to customize their device through KensingtonWorks.
• Product 2: Optical tracking technology provides 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; The blue 40mm ball has been specially designed with an absolute spherical, hard surface for precise tracking and control
• Product 2: Unique scroll Ring let you move up and down web pages or documents with ease; ambidextrous design works equally well for both right-handed and left-handed users
• Product 2: Detachable Wrist rest softly cushions and cradles the hand and wrist in an ergonomic position for pain-free productivity during extended periods of activity on the computer
• Product 2: Free downloadable KensingtonWorks software provides a personalized experience, giving you the ability to assign a wide variety of program functions to each of the 2 buttons, as well as adjusting cursor and scrolling speeds