Kensington Orbit Wireless Trackball with Scroll Ring - Space Gray (K72675WW) & Orbit Wireless Trackball Mouse with Touch Scroll Ring (K72352US),Black

• Product 1: Dual wireless connectivity offers the flexibility of 2.4 GHz and Bluetooth (3.0 and LE), with 128-bit AES government-grade encryption security Product 1: The scroll ring lets you spin the dial to move up and down web pages or documents with complete ease. And the 40mm ball’s hard surface is specially designed as a perfect sphere for precise tracking and control Product 1: 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 Product 1: Ambidextrous design works equally well for right-handed and left-handed users. Trackball reduces wrist and hand movement to ease repetitive-stress injuries Product 2: Optical tracking for superior cursor control Product 2: Unique touch scrolling — simply slide your finger around the outer ring of the trackball for effortless scrolling through web pages and long documents Product 2: Free downloadable KensingtonWorks software provides button customization Product 2: Ambidextrous design