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Adesso iMouse T40 Wireless Programmable Ergonomic Trackball Mouse - Optical - Wireless - 30 ft - Radio Frequency - 2.40 GHz - Black - USB - 4800 dpi - Trackball, Scroll Wheel - 7 Button(s) - Symmetrical - 2 x AAA Battery Supported

Adesso iMouse T40 Wireless Programmable Ergonomic Trackball Mouse - Optical - Wireless - 30 ft - Radio Frequency - 2.40 GHz - Black - USB - 4800 dpi - Trackball, Scroll Wheel - 7 Button(s) - Symmetrical - 2 x AAA Battery Supported

Kensington Orbit Trackball Mouse: This trackball mouse requires minimal wrist movement during use and features an ergonomic, symmetrical design, so you can enjoy lasting comfort while working at your PC or Mac.

Wireless, Powered by AAA battery (not provided), plug and play, easy to install. Simple to use with either the left or right hand or cradled between the both Press for laser pointer appearance for presentation. Off table and without limits of operational space. Your thumb can easily manage the scrolling function. USB 2.0 interface, plug and play, no software required. Handheld trackball mouse wireless, which can avoid any harm on your wrist and muscle, greatly reducing the chances for Arthritis and CTS suffers. Perfect for both desktops and laptops. Put your thumb on the roller ball and the tip of your index or middle finger on the trigger.

The Kensington trackball legacy continues with the latest addition to the patented Orbit Trackball with Scroll Ring - the Orbit Wireless Trackball with Scroll Ring. You asked for wireless, and we delivered, with the same great features that have made the Orbit Trackball with Scroll Ring so popular, including a patented scroll ring that allows you to scroll up & down pages with ease; customizable buttons; dual wireless connectivity offering the flexibility of 2.4 GHz and Bluetooth (3.0 and LE), with 128-bit AES government-grade encryption security; four DPI settings (400, 800, 1,200, or 1,600) that let you easily adjust the cursor speed to fit your needs; a detachable wrist rest; ambidextrous design; and plug-and-play ease for Mac or PC More from the Manufacturer
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This is a good ambidextrous mouse. It takes a little getting used to since your thumb is the clicker rather than your index finger. I'm sure it is the batteries that came with it, but, it drops the connection periodically and you have to press the connect button on the bottom.
Posted by Judyth