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Kensington Expert Wireless Trackball Mouse (K72359WW) Black, 3.5" x 6.1" x 8" & Orbit Wireless Trackball with Scroll Ring - Black-Red (K70990WW),
Kensington
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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: Connects wirelessly via built-in Bluetooth 4. 0LE or with the USB dongle using 2. 4Ghz wireless. Auto-sleep helps conserve battery life Product 2: 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 2: 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 2: 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 2: Ambidextrous design works equally well for right-handed and left-handed users. Trackball reduces wrist and hand movement to ease repetitive-stress injuries
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